Merge tag 's390-5.16-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

Pull s390 updates from Vasily Gorbik:

 - Add support for ftrace with direct call and ftrace direct call
   samples.

 - Add support for kernel command lines longer than current 896 bytes
   and make its length configurable.

 - Add support for BEAR enhancement facility to improve last breaking
   event instruction tracking.

 - Add kprobes sanity checks and testcases to prevent kprobe in the mid
   of an instruction.

 - Allow concurrent access to /dev/hwc for the CPUMF users.

 - Various ftrace / jump label improvements.

 - Convert unwinder tests to KUnit.

 - Add s390_iommu_aperture kernel parameter to tweak the limits on
   concurrently usable DMA mappings.

 - Add ap.useirq AP module option which can be used to disable interrupt
   use.

 - Add add_disk() error handling support to block device drivers.

 - Drop arch specific and use generic implementation of strlcpy and
   strrchr.

 - Several __pa/__va usages fixes.

 - Various cio, crypto, pci, kernel doc and other small fixes and
   improvements all over the code.

[ Merge fixup as per https://lore.kernel.org/all/YXAqZ%2FEszRisunQw@osiris/ ]

* tag 's390-5.16-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (63 commits)
  s390: make command line configurable
  s390: support command lines longer than 896 bytes
  s390/kexec_file: move kernel image size check
  s390/pci: add s390_iommu_aperture kernel parameter
  s390/spinlock: remove incorrect kernel doc indicator
  s390/string: use generic strlcpy
  s390/string: use generic strrchr
  s390/ap: function rework based on compiler warning
  s390/cio: make ccw_device_dma_* more robust
  s390/vfio-ap: s390/crypto: fix all kernel-doc warnings
  s390/hmcdrv: fix kernel doc comments
  s390/ap: new module option ap.useirq
  s390/cpumf: Allow multiple processes to access /dev/hwc
  s390/bitops: return true/false (not 1/0) from bool functions
  s390: add support for BEAR enhancement facility
  s390: introduce nospec_uses_trampoline()
  s390: rename last_break to pgm_last_break
  s390/ptrace: add last_break member to pt_regs
  s390/sclp: sort out physical vs virtual pointers usage
  s390/setup: convert start and end initrd pointers to virtual
  ...

3 files changed, 19 insertions, 4 deletions

diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c
index 44461928aab8..2bc55ccf3f23 100644
--- a/drivers/s390/cio/css.c
+++ b/drivers/s390/cio/css.c
@@ -792,10 +792,13 @@ static int __unset_online(struct device *dev, void *data)
 {
 	struct idset *set = data;
 	struct subchannel *sch = to_subchannel(dev);
-	struct ccw_device *cdev = sch_get_cdev(sch);
+	struct ccw_device *cdev;
 
-	if (cdev && cdev->online)
-		idset_sch_del(set, sch->schid);
+	if (sch->st == SUBCHANNEL_TYPE_IO) {
+		cdev = sch_get_cdev(sch);
+		if (cdev && cdev->online)
+			idset_sch_del(set, sch->schid);
+	}
 
 	return 0;
 }
diff --git a/drivers/s390/cio/device.c b/drivers/s390/cio/device.c
index 8d14569823d7..07a17613fab5 100644
--- a/drivers/s390/cio/device.c
+++ b/drivers/s390/cio/device.c
@@ -1322,6 +1322,7 @@ static int purge_fn(struct device *dev, void *data)
 {
 	struct ccw_device *cdev = to_ccwdev(dev);
 	struct ccw_dev_id *id = &cdev->private->dev_id;
+	struct subchannel *sch = to_subchannel(cdev->dev.parent);
 
 	spin_lock_irq(cdev->ccwlock);
 	if (is_blacklisted(id->ssid, id->devno) &&
@@ -1330,6 +1331,7 @@ static int purge_fn(struct device *dev, void *data)
 		CIO_MSG_EVENT(3, "ccw: purging 0.%x.%04x\n", id->ssid,
 			      id->devno);
 		ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
+		css_sched_sch_todo(sch, SCH_TODO_UNREG);
 		atomic_set(&cdev->private->onoff, 0);
 	}
 	spin_unlock_irq(cdev->ccwlock);
diff --git a/drivers/s390/cio/device_ops.c b/drivers/s390/cio/device_ops.c
index 0fe7b2f2e7f5..c533d1dadc6b 100644
--- a/drivers/s390/cio/device_ops.c
+++ b/drivers/s390/cio/device_ops.c
@@ -825,13 +825,23 @@ EXPORT_SYMBOL_GPL(ccw_device_get_chid);
  */
 void *ccw_device_dma_zalloc(struct ccw_device *cdev, size_t size)
 {
-	return cio_gp_dma_zalloc(cdev->private->dma_pool, &cdev->dev, size);
+	void *addr;
+
+	if (!get_device(&cdev->dev))
+		return NULL;
+	addr = cio_gp_dma_zalloc(cdev->private->dma_pool, &cdev->dev, size);
+	if (IS_ERR_OR_NULL(addr))
+		put_device(&cdev->dev);
+	return addr;
 }
 EXPORT_SYMBOL(ccw_device_dma_zalloc);
 
 void ccw_device_dma_free(struct ccw_device *cdev, void *cpu_addr, size_t size)
 {
+	if (!cpu_addr)
+		return;
 	cio_gp_dma_free(cdev->private->dma_pool, cpu_addr, size);
+	put_device(&cdev->dev);
 }
 EXPORT_SYMBOL(ccw_device_dma_free);