Merge tag 'char-misc-5.10-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc

Pull char/misc driver fixes from Greg KH:
 "Here are some small driver fixes, and one "large" revert, for
  5.10-rc7.

  They include:

   - revert mei patch from 5.10-rc1 that was using a reserved userspace
     value. It will be resubmitted once the proper id has been assigned
     by the virtio people.

   - habanalabs fixes found by the fall-through audit from Gustavo

   - speakup driver fixes for reported issues

   - fpga config build fix for reported issue.

  All of these except the revert have been in linux-next with no
  reported issues. The revert is "clean" and just removes a
  previously-added driver, so no real issue there"

* tag 'char-misc-5.10-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc:
  Revert "mei: virtio: virtualization frontend driver"
  fpga: Specify HAS_IOMEM dependency for FPGA_DFL
  habanalabs: put devices before driver removal
  habanalabs: free host huge va_range if not used
  speakup: Reject setting the speakup line discipline outside of speakup

7 files changed, 33 insertions, 909 deletions

diff --git a/drivers/accessibility/speakup/spk_ttyio.c b/drivers/accessibility/speakup/spk_ttyio.c
index 669392f31d4e..6284aff434a1 100644
--- a/drivers/accessibility/speakup/spk_ttyio.c
+++ b/drivers/accessibility/speakup/spk_ttyio.c
@@ -47,27 +47,20 @@ static int spk_ttyio_ldisc_open(struct tty_struct *tty)
 {
 	struct spk_ldisc_data *ldisc_data;
 
+	if (tty != speakup_tty)
+		/* Somebody tried to use this line discipline outside speakup */
+		return -ENODEV;
+
 	if (!tty->ops->write)
 		return -EOPNOTSUPP;
 
-	mutex_lock(&speakup_tty_mutex);
-	if (speakup_tty) {
-		mutex_unlock(&speakup_tty_mutex);
-		return -EBUSY;
-	}
-	speakup_tty = tty;
-
 	ldisc_data = kmalloc(sizeof(*ldisc_data), GFP_KERNEL);
-	if (!ldisc_data) {
-		speakup_tty = NULL;
-		mutex_unlock(&speakup_tty_mutex);
+	if (!ldisc_data)
 		return -ENOMEM;
-	}
 
 	init_completion(&ldisc_data->completion);
 	ldisc_data->buf_free = true;
-	speakup_tty->disc_data = ldisc_data;
-	mutex_unlock(&speakup_tty_mutex);
+	tty->disc_data = ldisc_data;
 
 	return 0;
 }
@@ -191,9 +184,25 @@ static int spk_ttyio_initialise_ldisc(struct spk_synth *synth)
 
 	tty_unlock(tty);
 
+	mutex_lock(&speakup_tty_mutex);
+	speakup_tty = tty;
 	ret = tty_set_ldisc(tty, N_SPEAKUP);
 	if (ret)
-		pr_err("speakup: Failed to set N_SPEAKUP on tty\n");
+		speakup_tty = NULL;
+	mutex_unlock(&speakup_tty_mutex);
+
+	if (!ret)
+		/* Success */
+		return 0;
+
+	pr_err("speakup: Failed to set N_SPEAKUP on tty\n");
+
+	tty_lock(tty);
+	if (tty->ops->close)
+		tty->ops->close(tty, NULL);
+	tty_unlock(tty);
+
+	tty_kclose(tty);
 
 	return ret;
 }
diff --git a/drivers/fpga/Kconfig b/drivers/fpga/Kconfig
index 7cd5a29fc437..5645226ca3ce 100644
--- a/drivers/fpga/Kconfig
+++ b/drivers/fpga/Kconfig
@@ -142,6 +142,7 @@ config FPGA_DFL
 	tristate "FPGA Device Feature List (DFL) support"
 	select FPGA_BRIDGE
 	select FPGA_REGION
+	depends on HAS_IOMEM
 	help
 	  Device Feature List (DFL) defines a feature list structure that
 	  creates a linked list of feature headers within the MMIO space
diff --git a/drivers/misc/habanalabs/common/device.c b/drivers/misc/habanalabs/common/device.c
index 20572224099a..783bbdcb1e61 100644
--- a/drivers/misc/habanalabs/common/device.c
+++ b/drivers/misc/habanalabs/common/device.c
@@ -231,16 +231,16 @@ delete_cdev_device:
 
 static void device_cdev_sysfs_del(struct hl_device *hdev)
 {
-	/* device_release() won't be called so must free devices explicitly */
-	if (!hdev->cdev_sysfs_created) {
-		kfree(hdev->dev_ctrl);
-		kfree(hdev->dev);
-		return;
-	}
+	if (!hdev->cdev_sysfs_created)
+		goto put_devices;
 
 	hl_sysfs_fini(hdev);
 	cdev_device_del(&hdev->cdev_ctrl, hdev->dev_ctrl);
 	cdev_device_del(&hdev->cdev, hdev->dev);
+
+put_devices:
+	put_device(hdev->dev);
+	put_device(hdev->dev_ctrl);
 }
 
 /*
@@ -1371,9 +1371,9 @@ sw_fini:
 early_fini:
 	device_early_fini(hdev);
 free_dev_ctrl:
-	kfree(hdev->dev_ctrl);
+	put_device(hdev->dev_ctrl);
 free_dev:
-	kfree(hdev->dev);
+	put_device(hdev->dev);
 out_disabled:
 	hdev->disabled = true;
 	if (add_cdev_sysfs_on_err)
diff --git a/drivers/misc/habanalabs/common/memory.c b/drivers/misc/habanalabs/common/memory.c
index 84227819e4d1..bfe223abf142 100644
--- a/drivers/misc/habanalabs/common/memory.c
+++ b/drivers/misc/habanalabs/common/memory.c
@@ -1626,6 +1626,7 @@ static int vm_ctx_init_with_ranges(struct hl_ctx *ctx,
 			goto host_hpage_range_err;
 		}
 	} else {
+		kfree(ctx->host_huge_va_range);
 		ctx->host_huge_va_range = ctx->host_va_range;
 	}
 
diff --git a/drivers/misc/mei/Kconfig b/drivers/misc/mei/Kconfig
index c06581ffa7bd..f5fd5b786607 100644
--- a/drivers/misc/mei/Kconfig
+++ b/drivers/misc/mei/Kconfig
@@ -46,14 +46,4 @@ config INTEL_MEI_TXE
 	  Supported SoCs:
 	  Intel Bay Trail
 
-config INTEL_MEI_VIRTIO
-	tristate "Intel MEI interface emulation with virtio framework"
-	select INTEL_MEI
-	depends on X86 && PCI && VIRTIO_PCI
-	help
-	  This module implements mei hw emulation over virtio transport.
-	  The module will be called mei_virtio.
-	  Enable this if your virtual machine supports virtual mei
-	  device over virtio.
-
 source "drivers/misc/mei/hdcp/Kconfig"
diff --git a/drivers/misc/mei/Makefile b/drivers/misc/mei/Makefile
index 52aefaab5c1b..f1c76f7ee804 100644
--- a/drivers/misc/mei/Makefile
+++ b/drivers/misc/mei/Makefile
@@ -22,9 +22,6 @@ obj-$(CONFIG_INTEL_MEI_TXE) += mei-txe.o
 mei-txe-objs := pci-txe.o
 mei-txe-objs += hw-txe.o
 
-obj-$(CONFIG_INTEL_MEI_VIRTIO) += mei-virtio.o
-mei-virtio-objs := hw-virtio.o
-
 mei-$(CONFIG_EVENT_TRACING) += mei-trace.o
 CFLAGS_mei-trace.o = -I$(src)
 
diff --git a/drivers/misc/mei/hw-virtio.c b/drivers/misc/mei/hw-virtio.c
deleted file mode 100644
index 899dc1c5e7ca..000000000000
--- a/drivers/misc/mei/hw-virtio.c
+++ /dev/null
@@ -1,874 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Intel Management Engine Interface (Intel MEI) Linux driver
- * Copyright (c) 2018-2020, Intel Corporation.
- */
-#include <linux/err.h>
-#include <linux/module.h>
-#include <linux/pm_runtime.h>
-#include <linux/scatterlist.h>
-#include <linux/spinlock.h>
-#include <linux/slab.h>
-#include <linux/virtio.h>
-#include <linux/virtio_config.h>
-#include <linux/virtio_ids.h>
-#include <linux/atomic.h>
-
-#include "mei_dev.h"
-#include "hbm.h"
-#include "client.h"
-
-#define MEI_VIRTIO_RPM_TIMEOUT 500
-/* ACRN virtio device types */
-#ifndef VIRTIO_ID_MEI
-#define VIRTIO_ID_MEI 0xFFFE /* virtio mei */
-#endif
-
-/**
- * struct mei_virtio_cfg - settings passed from the virtio backend
- * @buf_depth: read buffer depth in slots (4bytes)
- * @hw_ready: hw is ready for operation
- * @host_reset: synchronize reset with virtio backend
- * @reserved: reserved for alignment
- * @fw_status: FW status
- */
-struct mei_virtio_cfg {
-	u32 buf_depth;
-	u8 hw_ready;
-	u8 host_reset;
-	u8 reserved[2];
-	u32 fw_status[MEI_FW_STATUS_MAX];
-} __packed;
-
-struct mei_virtio_hw {
-	struct mei_device mdev;
-	char name[32];
-
-	struct virtqueue *in;
-	struct virtqueue *out;
-
-	bool host_ready;
-	struct work_struct intr_handler;
-
-	u32 *recv_buf;
-	u8 recv_rdy;
-	size_t recv_sz;
-	u32 recv_idx;
-	u32 recv_len;
-
-	/* send buffer */
-	atomic_t hbuf_ready;
-	const void *send_hdr;
-	const void *send_buf;
-
-	struct mei_virtio_cfg cfg;
-};
-
-#define to_virtio_hw(_dev) container_of(_dev, struct mei_virtio_hw, mdev)
-
-/**
- * mei_virtio_fw_status() - read status register of mei
- * @dev: mei device
- * @fw_status: fw status register values
- *
- * Return: always 0
- */
-static int mei_virtio_fw_status(struct mei_device *dev,
-				struct mei_fw_status *fw_status)
-{
-	struct virtio_device *vdev = dev_to_virtio(dev->dev);
-
-	fw_status->count = MEI_FW_STATUS_MAX;
-	virtio_cread_bytes(vdev, offsetof(struct mei_virtio_cfg, fw_status),
-			   fw_status->status, sizeof(fw_status->status));
-	return 0;
-}
-
-/**
- * mei_virtio_pg_state() - translate internal pg state
- *   to the mei power gating state
- *   There is no power management in ACRN mode always return OFF
- * @dev: mei device
- *
- * Return:
- * * MEI_PG_OFF - if aliveness is on (always)
- * * MEI_PG_ON  - (never)
- */
-static inline enum mei_pg_state mei_virtio_pg_state(struct mei_device *dev)
-{
-	return MEI_PG_OFF;
-}
-
-/**
- * mei_virtio_hw_config() - configure hw dependent settings
- *
- * @dev: mei device
- *
- * Return: always 0
- */
-static int mei_virtio_hw_config(struct mei_device *dev)
-{
-	return 0;
-}
-
-/**
- * mei_virtio_hbuf_empty_slots() - counts write empty slots.
- * @dev: the device structure
- *
- * Return: always return frontend buf size if buffer is ready, 0 otherwise
- */
-static int mei_virtio_hbuf_empty_slots(struct mei_device *dev)
-{
-	struct mei_virtio_hw *hw = to_virtio_hw(dev);
-
-	return (atomic_read(&hw->hbuf_ready) == 1) ? hw->cfg.buf_depth : 0;
-}
-
-/**
- * mei_virtio_hbuf_is_ready() - checks if write buffer is ready
- * @dev: the device structure
- *
- * Return: true if hbuf is ready
- */
-static bool mei_virtio_hbuf_is_ready(struct mei_device *dev)
-{
-	struct mei_virtio_hw *hw = to_virtio_hw(dev);
-
-	return atomic_read(&hw->hbuf_ready) == 1;
-}
-
-/**
- * mei_virtio_hbuf_max_depth() - returns depth of FE write buffer.
- * @dev: the device structure
- *
- * Return: size of frontend write buffer in bytes
- */
-static u32 mei_virtio_hbuf_depth(const struct mei_device *dev)
-{
-	struct mei_virtio_hw *hw = to_virtio_hw(dev);
-
-	return hw->cfg.buf_depth;
-}
-
-/**
- * mei_virtio_intr_clear() - clear and stop interrupts
- * @dev: the device structure
- */
-static void mei_virtio_intr_clear(struct mei_device *dev)
-{
-	/*
-	 * In our virtio solution, there are two types of interrupts,
-	 * vq interrupt and config change interrupt.
-	 *   1) start/reset rely on virtio config changed interrupt;
-	 *   2) send/recv rely on virtio virtqueue interrupts.
-	 * They are all virtual interrupts. So, we don't have corresponding
-	 * operation to do here.
-	 */
-}
-
-/**
- * mei_virtio_intr_enable() - enables mei BE virtqueues callbacks
- * @dev: the device structure
- */
-static void mei_virtio_intr_enable(struct mei_device *dev)
-{
-	struct mei_virtio_hw *hw = to_virtio_hw(dev);
-	struct virtio_device *vdev = dev_to_virtio(dev->dev);
-
-	virtio_config_enable(vdev);
-
-	virtqueue_enable_cb(hw->in);
-	virtqueue_enable_cb(hw->out);
-}
-
-/**
- * mei_virtio_intr_disable() - disables mei BE virtqueues callbacks
- *
- * @dev: the device structure
- */
-static void mei_virtio_intr_disable(struct mei_device *dev)
-{
-	struct mei_virtio_hw *hw = to_virtio_hw(dev);
-	struct virtio_device *vdev = dev_to_virtio(dev->dev);
-
-	virtio_config_disable(vdev);
-
-	virtqueue_disable_cb(hw->in);
-	virtqueue_disable_cb(hw->out);
-}
-
-/**
- * mei_virtio_synchronize_irq() - wait for pending IRQ handlers for all
- *     virtqueue
- * @dev: the device structure
- */
-static void mei_virtio_synchronize_irq(struct mei_device *dev)
-{
-	struct mei_virtio_hw *hw = to_virtio_hw(dev);
-
-	/*
-	 * Now, all IRQ handlers are converted to workqueue.
-	 * Change synchronize irq to flush this work.
-	 */
-	flush_work(&hw->intr_handler);
-}
-
-static void mei_virtio_free_outbufs(struct mei_virtio_hw *hw)
-{
-	kfree(hw->send_hdr);
-	kfree(hw->send_buf);
-	hw->send_hdr = NULL;
-	hw->send_buf = NULL;
-}
-
-/**
- * mei_virtio_write_message() - writes a message to mei virtio back-end service.
- * @dev: the device structure
- * @hdr: mei header of message
- * @hdr_len: header length
- * @data: message payload will be written
- * @data_len: message payload length
- *
- * Return:
- * *  0: on success
- * * -EIO: if write has failed
- * * -ENOMEM: on memory allocation failure
- */
-static int mei_virtio_write_message(struct mei_device *dev,
-				    const void *hdr, size_t hdr_len,
-				    const void *data, size_t data_len)
-{
-	struct mei_virtio_hw *hw = to_virtio_hw(dev);
-	struct scatterlist sg[2];
-	const void *hbuf, *dbuf;
-	int ret;
-
-	if (WARN_ON(!atomic_add_unless(&hw->hbuf_ready, -1, 0)))
-		return -EIO;
-
-	hbuf = kmemdup(hdr, hdr_len, GFP_KERNEL);
-	hw->send_hdr = hbuf;
-
-	dbuf = kmemdup(data, data_len, GFP_KERNEL);
-	hw->send_buf = dbuf;
-
-	if (!hbuf || !dbuf) {
-		ret = -ENOMEM;
-		goto fail;
-	}
-
-	sg_init_table(sg, 2);
-	sg_set_buf(&sg[0], hbuf, hdr_len);
-	sg_set_buf(&sg[1], dbuf, data_len);
-
-	ret = virtqueue_add_outbuf(hw->out, sg, 2, hw, GFP_KERNEL);
-	if (ret) {
-		dev_err(dev->dev, "failed to add outbuf\n");
-		goto fail;
-	}
-
-	virtqueue_kick(hw->out);
-	return 0;
-fail:
-
-	mei_virtio_free_outbufs(hw);
-
-	return ret;
-}
-
-/**
- * mei_virtio_count_full_read_slots() - counts read full slots.
- * @dev: the device structure
- *
- * Return: -EOVERFLOW if overflow, otherwise filled slots count
- */
-static int mei_virtio_count_full_read_slots(struct mei_device *dev)
-{
-	struct mei_virtio_hw *hw = to_virtio_hw(dev);
-
-	if (hw->recv_idx > hw->recv_len)
-		return -EOVERFLOW;
-
-	return hw->recv_len - hw->recv_idx;
-}
-
-/**
- * mei_virtio_read_hdr() - Reads 32bit dword from mei virtio receive buffer
- *
- * @dev: the device structure
- *
- * Return: 32bit dword of receive buffer (u32)
- */
-static inline u32 mei_virtio_read_hdr(const struct mei_device *dev)
-{
-	struct mei_virtio_hw *hw = to_virtio_hw(dev);
-
-	WARN_ON(hw->cfg.buf_depth < hw->recv_idx + 1);
-
-	return hw->recv_buf[hw->recv_idx++];
-}
-
-static int mei_virtio_read(struct mei_device *dev, unsigned char *buffer,
-			   unsigned long len)
-{
-	struct mei_virtio_hw *hw = to_virtio_hw(dev);
-	u32 slots = mei_data2slots(len);
-
-	if (WARN_ON(hw->cfg.buf_depth < hw->recv_idx + slots))
-		return -EOVERFLOW;
-
-	/*
-	 * Assumption: There is only one MEI message in recv_buf each time.
-	 * Backend service need follow this rule too.
-	 */
-	memcpy(buffer, hw->recv_buf + hw->recv_idx, len);
-	hw->recv_idx += slots;
-
-	return 0;
-}
-
-static bool mei_virtio_pg_is_enabled(struct mei_device *dev)
-{
-	return false;
-}
-
-static bool mei_virtio_pg_in_transition(struct mei_device *dev)
-{
-	return false;
-}
-
-static void mei_virtio_add_recv_buf(struct mei_virtio_hw *hw)
-{
-	struct scatterlist sg;
-
-	if (hw->recv_rdy) /* not needed */
-		return;
-
-	/* refill the recv_buf to IN virtqueue to get next message */
-	sg_init_one(&sg, hw->recv_buf, mei_slots2data(hw->cfg.buf_depth));
-	hw->recv_len = 0;
-	hw->recv_idx = 0;
-	hw->recv_rdy = 1;
-	virtqueue_add_inbuf(hw->in, &sg, 1, hw->recv_buf, GFP_KERNEL);
-	virtqueue_kick(hw->in);
-}
-
-/**
- * mei_virtio_hw_is_ready() - check whether the BE(hw) has turned ready
- * @dev: mei device
- * Return: bool
- */
-static bool mei_virtio_hw_is_ready(struct mei_device *dev)
-{
-	struct mei_virtio_hw *hw = to_virtio_hw(dev);
-	struct virtio_device *vdev = dev_to_virtio(dev->dev);
-
-	virtio_cread(vdev, struct mei_virtio_cfg,
-		     hw_ready, &hw->cfg.hw_ready);
-
-	dev_dbg(dev->dev, "hw ready %d\n", hw->cfg.hw_ready);
-
-	return hw->cfg.hw_ready;
-}
-
-/**
- * mei_virtio_hw_reset - resets virtio hw.
- *
- * @dev: the device structure
- * @intr_enable: virtio use data/config callbacks
- *
- * Return: 0 on success an error code otherwise
- */
-static int mei_virtio_hw_reset(struct mei_device *dev, bool intr_enable)
-{
-	struct mei_virtio_hw *hw = to_virtio_hw(dev);
-	struct virtio_device *vdev = dev_to_virtio(dev->dev);
-
-	dev_dbg(dev->dev, "hw reset\n");
-
-	dev->recvd_hw_ready = false;
-	hw->host_ready = false;
-	atomic_set(&hw->hbuf_ready, 0);
-	hw->recv_len = 0;
-	hw->recv_idx = 0;
-
-	hw->cfg.host_reset = 1;
-	virtio_cwrite(vdev, struct mei_virtio_cfg,
-		      host_reset, &hw->cfg.host_reset);
-
-	mei_virtio_hw_is_ready(dev);
-
-	if (intr_enable)
-		mei_virtio_intr_enable(dev);
-
-	return 0;
-}
-
-/**
- * mei_virtio_hw_reset_release() - release device from the reset
- * @dev: the device structure
- */
-static void mei_virtio_hw_reset_release(struct mei_device *dev)
-{
-	struct mei_virtio_hw *hw = to_virtio_hw(dev);
-	struct virtio_device *vdev = dev_to_virtio(dev->dev);
-
-	dev_dbg(dev->dev, "hw reset release\n");
-	hw->cfg.host_reset = 0;
-	virtio_cwrite(vdev, struct mei_virtio_cfg,
-		      host_reset, &hw->cfg.host_reset);
-}
-
-/**
- * mei_virtio_hw_ready_wait() - wait until the virtio(hw) has turned ready
- *  or timeout is reached
- * @dev: mei device
- *
- * Return: 0 on success, error otherwise
- */
-static int mei_virtio_hw_ready_wait(struct mei_device *dev)
-{
-	mutex_unlock(&dev->device_lock);
-	wait_event_timeout(dev->wait_hw_ready,
-			   dev->recvd_hw_ready,
-			   mei_secs_to_jiffies(MEI_HW_READY_TIMEOUT));
-	mutex_lock(&dev->device_lock);
-	if (!dev->recvd_hw_ready) {
-		dev_err(dev->dev, "wait hw ready failed\n");
-		return -ETIMEDOUT;
-	}
-
-	dev->recvd_hw_ready = false;
-	return 0;
-}
-
-/**
- * mei_virtio_hw_start() - hw start routine
- * @dev: mei device
- *
- * Return: 0 on success, error otherwise
- */
-static int mei_virtio_hw_start(struct mei_device *dev)
-{
-	struct mei_virtio_hw *hw = to_virtio_hw(dev);
-	int ret;
-
-	dev_dbg(dev->dev, "hw start\n");
-	mei_virtio_hw_reset_release(dev);
-
-	ret = mei_virtio_hw_ready_wait(dev);
-	if (ret)
-		return ret;
-
-	mei_virtio_add_recv_buf(hw);
-	atomic_set(&hw->hbuf_ready, 1);
-	dev_dbg(dev->dev, "hw is ready\n");
-	hw->host_ready = true;
-
-	return 0;
-}
-
-/**
- * mei_virtio_host_is_ready() - check whether the FE has turned ready
- * @dev: mei device
- *
- * Return: bool
- */
-static bool mei_virtio_host_is_ready(struct mei_device *dev)
-{
-	struct mei_virtio_hw *hw = to_virtio_hw(dev);
-
-	dev_dbg(dev->dev, "host ready %d\n", hw->host_ready);
-
-	return hw->host_ready;
-}
-
-/**
- * mei_virtio_data_in() - The callback of recv virtqueue of virtio mei
- * @vq: receiving virtqueue
- */
-static void mei_virtio_data_in(struct virtqueue *vq)
-{
-	struct mei_virtio_hw *hw = vq->vdev->priv;
-
-	/* disable interrupts (enabled again from in the interrupt worker) */
-	virtqueue_disable_cb(hw->in);
-
-	schedule_work(&hw->intr_handler);
-}
-
-/**
- * mei_virtio_data_out() - The callback of send virtqueue of virtio mei
- * @vq: transmitting virtqueue
- */
-static void mei_virtio_data_out(struct virtqueue *vq)
-{
-	struct mei_virtio_hw *hw = vq->vdev->priv;
-
-	schedule_work(&hw->intr_handler);
-}
-
-static void mei_virtio_intr_handler(struct work_struct *work)
-{
-	struct mei_virtio_hw *hw =
-		container_of(work, struct mei_virtio_hw, intr_handler);
-	struct mei_device *dev = &hw->mdev;
-	LIST_HEAD(complete_list);
-	s32 slots;
-	int rets = 0;
-	void *data;
-	unsigned int len;
-
-	mutex_lock(&dev->device_lock);
-
-	if (dev->dev_state == MEI_DEV_DISABLED) {
-		dev_warn(dev->dev, "Interrupt in disabled state.\n");
-		mei_virtio_intr_disable(dev);
-		goto end;
-	}
-
-	/* check if ME wants a reset */
-	if (!mei_hw_is_ready(dev) && dev->dev_state != MEI_DEV_RESETTING) {
-		dev_warn(dev->dev, "BE service not ready: resetting.\n");
-		schedule_work(&dev->reset_work);
-		goto end;
-	}
-
-	/* check if we need to start the dev */
-	if (!mei_host_is_ready(dev)) {
-		if (mei_hw_is_ready(dev)) {
-			dev_dbg(dev->dev, "we need to start the dev.\n");
-			dev->recvd_hw_ready = true;
-			wake_up(&dev->wait_hw_ready);
-		} else {
-			dev_warn(dev->dev, "Spurious Interrupt\n");
-		}
-		goto end;
-	}
-
-	/* read */
-	if (hw->recv_rdy) {
-		data = virtqueue_get_buf(hw->in, &len);
-		if (!data || !len) {
-			dev_dbg(dev->dev, "No data %d", len);
-		} else {
-			dev_dbg(dev->dev, "data_in %d\n", len);
-			WARN_ON(data != hw->recv_buf);
-			hw->recv_len = mei_data2slots(len);
-			hw->recv_rdy = 0;
-		}
-	}
-
-	/* write */
-	if (!atomic_read(&hw->hbuf_ready)) {
-		if (!virtqueue_get_buf(hw->out, &len)) {
-			dev_warn(dev->dev, "Failed to getbuf\n");
-		} else {
-			mei_virtio_free_outbufs(hw);
-			atomic_inc(&hw->hbuf_ready);
-		}
-	}
-
-	/* check slots available for reading */
-	slots = mei_count_full_read_slots(dev);
-	while (slots > 0) {
-		dev_dbg(dev->dev, "slots to read = %08x\n", slots);
-		rets = mei_irq_read_handler(dev, &complete_list, &slots);
-
-		if (rets &&
-		    (dev->dev_state != MEI_DEV_RESETTING &&
-		     dev->dev_state != MEI_DEV_POWER_DOWN)) {
-			dev_err(dev->dev, "mei_irq_read_handler ret = %d.\n",
-				rets);
-			schedule_work(&dev->reset_work);
-			goto end;
-		}
-	}
-
-	dev->hbuf_is_ready = mei_hbuf_is_ready(dev);
-
-	mei_irq_write_handler(dev, &complete_list);
-
-	dev->hbuf_is_ready = mei_hbuf_is_ready(dev);
-
-	mei_irq_compl_handler(dev, &complete_list);
-
-	mei_virtio_add_recv_buf(hw);
-
-end:
-	if (dev->dev_state != MEI_DEV_DISABLED) {
-		if (!virtqueue_enable_cb(hw->in))
-			schedule_work(&hw->intr_handler);
-	}
-
-	mutex_unlock(&dev->device_lock);
-}
-
-static void mei_virtio_config_changed(struct virtio_device *vdev)
-{
-	struct mei_virtio_hw *hw = vdev->priv;
-	struct mei_device *dev = &hw->mdev;
-
-	virtio_cread(vdev, struct mei_virtio_cfg,
-		     hw_ready, &hw->cfg.hw_ready);
-
-	if (dev->dev_state == MEI_DEV_DISABLED) {
-		dev_dbg(dev->dev, "disabled state don't start\n");
-		return;
-	}
-
-	/* Run intr handler once to handle reset notify */
-	schedule_work(&hw->intr_handler);
-}
-
-static void mei_virtio_remove_vqs(struct virtio_device *vdev)
-{
-	struct mei_virtio_hw *hw = vdev->priv;
-
-	virtqueue_detach_unused_buf(hw->in);
-	hw->recv_len = 0;
-	hw->recv_idx = 0;
-	hw->recv_rdy = 0;
-
-	virtqueue_detach_unused_buf(hw->out);
-
-	mei_virtio_free_outbufs(hw);
-
-	vdev->config->del_vqs(vdev);
-}
-
-/*
- * There are two virtqueues, one is for send and another is for recv.
- */
-static int mei_virtio_init_vqs(struct mei_virtio_hw *hw,
-			       struct virtio_device *vdev)
-{
-	struct virtqueue *vqs[2];
-
-	vq_callback_t *cbs[] = {
-		mei_virtio_data_in,
-		mei_virtio_data_out,
-	};
-	static const char * const names[] = {
-		"in",
-		"out",
-	};
-	int ret;
-
-	ret = virtio_find_vqs(vdev, 2, vqs, cbs, names, NULL);
-	if (ret)
-		return ret;
-
-	hw->in = vqs[0];
-	hw->out = vqs[1];
-
-	return 0;
-}
-
-static const struct mei_hw_ops mei_virtio_ops = {
-	.fw_status = mei_virtio_fw_status,
-	.pg_state  = mei_virtio_pg_state,
-
-	.host_is_ready = mei_virtio_host_is_ready,
-
-	.hw_is_ready = mei_virtio_hw_is_ready,
-	.hw_reset = mei_virtio_hw_reset,
-	.hw_config = mei_virtio_hw_config,
-	.hw_start = mei_virtio_hw_start,
-
-	.pg_in_transition = mei_virtio_pg_in_transition,
-	.pg_is_enabled = mei_virtio_pg_is_enabled,
-
-	.intr_clear = mei_virtio_intr_clear,
-	.intr_enable = mei_virtio_intr_enable,
-	.intr_disable = mei_virtio_intr_disable,
-	.synchronize_irq = mei_virtio_synchronize_irq,
-
-	.hbuf_free_slots = mei_virtio_hbuf_empty_slots,
-	.hbuf_is_ready = mei_virtio_hbuf_is_ready,
-	.hbuf_depth = mei_virtio_hbuf_depth,
-
-	.write = mei_virtio_write_message,
-
-	.rdbuf_full_slots = mei_virtio_count_full_read_slots,
-	.read_hdr = mei_virtio_read_hdr,
-	.read = mei_virtio_read,
-};
-
-static int mei_virtio_probe(struct virtio_device *vdev)
-{
-	struct mei_virtio_hw *hw;
-	int ret;
-
-	hw = devm_kzalloc(&vdev->dev, sizeof(*hw), GFP_KERNEL);
-	if (!hw)
-		return -ENOMEM;
-
-	vdev->priv = hw;
-
-	INIT_WORK(&hw->intr_handler, mei_virtio_intr_handler);
-
-	ret = mei_virtio_init_vqs(hw, vdev);
-	if (ret)
-		goto vqs_failed;
-
-	virtio_cread(vdev, struct mei_virtio_cfg,
-		     buf_depth, &hw->cfg.buf_depth);
-
-	hw->recv_buf = kzalloc(mei_slots2data(hw->cfg.buf_depth), GFP_KERNEL);
-	if (!hw->recv_buf) {
-		ret = -ENOMEM;
-		goto hbuf_failed;
-	}
-	atomic_set(&hw->hbuf_ready, 0);
-
-	virtio_device_ready(vdev);
-
-	mei_device_init(&hw->mdev, &vdev->dev, &mei_virtio_ops);
-
-	pm_runtime_get_noresume(&vdev->dev);
-	pm_runtime_set_active(&vdev->dev);
-	pm_runtime_enable(&vdev->dev);
-
-	ret = mei_start(&hw->mdev);
-	if (ret)
-		goto mei_start_failed;
-
-	pm_runtime_set_autosuspend_delay(&vdev->dev, MEI_VIRTIO_RPM_TIMEOUT);
-	pm_runtime_use_autosuspend(&vdev->dev);
-
-	ret = mei_register(&hw->mdev, &vdev->dev);
-	if (ret)
-		goto mei_failed;
-
-	pm_runtime_put(&vdev->dev);
-
-	return 0;
-
-mei_failed:
-	mei_stop(&hw->mdev);
-mei_start_failed:
-	mei_cancel_work(&hw->mdev);
-	mei_disable_interrupts(&hw->mdev);
-	kfree(hw->recv_buf);
-hbuf_failed:
-	vdev->config->del_vqs(vdev);
-vqs_failed:
-	return ret;
-}
-
-static int __maybe_unused mei_virtio_pm_runtime_idle(struct device *device)
-{
-	struct virtio_device *vdev = dev_to_virtio(device);
-	struct mei_virtio_hw *hw = vdev->priv;
-
-	dev_dbg(&vdev->dev, "rpm: mei_virtio : runtime_idle\n");
-
-	if (!hw)
-		return -ENODEV;
-
-	if (mei_write_is_idle(&hw->mdev))
-		pm_runtime_autosuspend(device);
-
-	return -EBUSY;
-}
-
-static int __maybe_unused mei_virtio_pm_runtime_suspend(struct device *device)
-{
-	return 0;
-}
-
-static int __maybe_unused mei_virtio_pm_runtime_resume(struct device *device)
-{
-	return 0;
-}
-
-static int __maybe_unused mei_virtio_freeze(struct virtio_device *vdev)
-{
-	struct mei_virtio_hw *hw = vdev->priv;
-
-	dev_dbg(&vdev->dev, "freeze\n");
-
-	if (!hw)
-		return -ENODEV;
-
-	mei_stop(&hw->mdev);
-	mei_disable_interrupts(&hw->mdev);
-	cancel_work_sync(&hw->intr_handler);
-	vdev->config->reset(vdev);
-	mei_virtio_remove_vqs(vdev);
-
-	return 0;
-}
-
-static int __maybe_unused mei_virtio_restore(struct virtio_device *vdev)
-{
-	struct mei_virtio_hw *hw = vdev->priv;
-	int ret;
-
-	dev_dbg(&vdev->dev, "restore\n");
-
-	if (!hw)
-		return -ENODEV;
-
-	ret = mei_virtio_init_vqs(hw, vdev);
-	if (ret)
-		return ret;
-
-	virtio_device_ready(vdev);
-
-	ret = mei_restart(&hw->mdev);
-	if (ret)
-		return ret;
-
-	/* Start timer if stopped in suspend */
-	schedule_delayed_work(&hw->mdev.timer_work, HZ);
-
-	return 0;
-}
-
-static const struct dev_pm_ops mei_virtio_pm_ops = {
-	SET_RUNTIME_PM_OPS(mei_virtio_pm_runtime_suspend,
-			   mei_virtio_pm_runtime_resume,
-			   mei_virtio_pm_runtime_idle)
-};
-
-static void mei_virtio_remove(struct virtio_device *vdev)
-{
-	struct mei_virtio_hw *hw = vdev->priv;
-
-	mei_stop(&hw->mdev);
-	mei_disable_interrupts(&hw->mdev);
-	cancel_work_sync(&hw->intr_handler);
-	mei_deregister(&hw->mdev);
-	vdev->config->reset(vdev);
-	mei_virtio_remove_vqs(vdev);
-	kfree(hw->recv_buf);
-	pm_runtime_disable(&vdev->dev);
-}
-
-static struct virtio_device_id id_table[] = {
-	{ VIRTIO_ID_MEI, VIRTIO_DEV_ANY_ID },
-	{ }
-};
-
-static struct virtio_driver mei_virtio_driver = {
-	.id_table = id_table,
-	.probe = mei_virtio_probe,
-	.remove = mei_virtio_remove,
-	.config_changed = mei_virtio_config_changed,
-	.driver = {
-		.name = KBUILD_MODNAME,
-		.owner = THIS_MODULE,
-		.pm = &mei_virtio_pm_ops,
-	},
-#ifdef CONFIG_PM_SLEEP
-	.freeze = mei_virtio_freeze,
-	.restore = mei_virtio_restore,
-#endif
-};
-
-module_virtio_driver(mei_virtio_driver);
-MODULE_DEVICE_TABLE(virtio, id_table);
-MODULE_DESCRIPTION("Virtio MEI frontend driver");
-MODULE_LICENSE("GPL v2");