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-rw-r--r--drivers/hid/hid-core.c23
-rw-r--r--drivers/hid/hid-magicmouse.c5
-rw-r--r--drivers/hid/hidraw.c48
-rw-r--r--drivers/hid/usbhid/hid-core.c24
-rw-r--r--drivers/hid/usbhid/hiddev.c19
-rw-r--r--include/linux/hid.h8
6 files changed, 86 insertions, 41 deletions
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index 69fdf1e2347b..33cac4890ca4 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -1081,35 +1081,28 @@ int hid_input_report(struct hid_device *hid, int type, u8 *data, int size, int i
buf = kmalloc(sizeof(char) * HID_DEBUG_BUFSIZE, GFP_ATOMIC);
- if (!buf) {
- report = hid_get_report(report_enum, data);
+ if (!buf)
goto nomem;
- }
-
- snprintf(buf, HID_DEBUG_BUFSIZE - 1,
- "\nreport (size %u) (%snumbered)\n", size, report_enum->numbered ? "" : "un");
- hid_debug_event(hid, buf);
-
- report = hid_get_report(report_enum, data);
- if (!report) {
- kfree(buf);
- return -1;
- }
/* dump the report */
snprintf(buf, HID_DEBUG_BUFSIZE - 1,
- "report %d (size %u) = ", report->id, size);
+ "\nreport (size %u) (%snumbered) = ", size, report_enum->numbered ? "" : "un");
hid_debug_event(hid, buf);
+
for (i = 0; i < size; i++) {
snprintf(buf, HID_DEBUG_BUFSIZE - 1,
" %02x", data[i]);
hid_debug_event(hid, buf);
}
hid_debug_event(hid, "\n");
-
kfree(buf);
nomem:
+ report = hid_get_report(report_enum, data);
+
+ if (!report)
+ return -1;
+
if (hdrv && hdrv->raw_event && hid_match_report(hid, report)) {
ret = hdrv->raw_event(hid, report, data, size);
if (ret != 0)
diff --git a/drivers/hid/hid-magicmouse.c b/drivers/hid/hid-magicmouse.c
index 0d471fc2ab82..f10d56a15f21 100644
--- a/drivers/hid/hid-magicmouse.c
+++ b/drivers/hid/hid-magicmouse.c
@@ -354,12 +354,15 @@ static int magicmouse_probe(struct hid_device *hdev,
goto err_free;
}
- ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_HIDINPUT);
+ ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
if (ret) {
dev_err(&hdev->dev, "magicmouse hw start failed\n");
goto err_free;
}
+ /* we are handling the input ourselves */
+ hidinput_disconnect(hdev);
+
report = hid_register_report(hdev, HID_INPUT_REPORT, TOUCH_REPORT_ID);
if (!report) {
dev_err(&hdev->dev, "unable to register touch report\n");
diff --git a/drivers/hid/hidraw.c b/drivers/hid/hidraw.c
index a9becf9cd0f6..3ccd47850677 100644
--- a/drivers/hid/hidraw.c
+++ b/drivers/hid/hidraw.c
@@ -106,38 +106,48 @@ out:
static ssize_t hidraw_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
{
unsigned int minor = iminor(file->f_path.dentry->d_inode);
- /* FIXME: What stops hidraw_table going NULL */
- struct hid_device *dev = hidraw_table[minor]->hid;
+ struct hid_device *dev;
__u8 *buf;
int ret = 0;
- if (!dev->hid_output_raw_report)
- return -ENODEV;
+ mutex_lock(&minors_lock);
+ dev = hidraw_table[minor]->hid;
+
+ if (!dev->hid_output_raw_report) {
+ ret = -ENODEV;
+ goto out;
+ }
if (count > HID_MAX_BUFFER_SIZE) {
printk(KERN_WARNING "hidraw: pid %d passed too large report\n",
task_pid_nr(current));
- return -EINVAL;
+ ret = -EINVAL;
+ goto out;
}
if (count < 2) {
printk(KERN_WARNING "hidraw: pid %d passed too short report\n",
task_pid_nr(current));
- return -EINVAL;
+ ret = -EINVAL;
+ goto out;
}
buf = kmalloc(count * sizeof(__u8), GFP_KERNEL);
- if (!buf)
- return -ENOMEM;
+ if (!buf) {
+ ret = -ENOMEM;
+ goto out;
+ }
if (copy_from_user(buf, buffer, count)) {
ret = -EFAULT;
- goto out;
+ goto out_free;
}
ret = dev->hid_output_raw_report(dev, buf, count, HID_OUTPUT_REPORT);
-out:
+out_free:
kfree(buf);
+out:
+ mutex_unlock(&minors_lock);
return ret;
}
@@ -165,11 +175,8 @@ static int hidraw_open(struct inode *inode, struct file *file)
goto out;
}
- lock_kernel();
mutex_lock(&minors_lock);
if (!hidraw_table[minor]) {
- printk(KERN_EMERG "hidraw device with minor %d doesn't exist\n",
- minor);
kfree(list);
err = -ENODEV;
goto out_unlock;
@@ -197,7 +204,6 @@ static int hidraw_open(struct inode *inode, struct file *file)
out_unlock:
mutex_unlock(&minors_lock);
- unlock_kernel();
out:
return err;
@@ -209,11 +215,8 @@ static int hidraw_release(struct inode * inode, struct file * file)
struct hidraw *dev;
struct hidraw_list *list = file->private_data;
- if (!hidraw_table[minor]) {
- printk(KERN_EMERG "hidraw device with minor %d doesn't exist\n",
- minor);
+ if (!hidraw_table[minor])
return -ENODEV;
- }
list_del(&list->node);
dev = hidraw_table[minor];
@@ -238,11 +241,12 @@ static long hidraw_ioctl(struct file *file, unsigned int cmd,
struct inode *inode = file->f_path.dentry->d_inode;
unsigned int minor = iminor(inode);
long ret = 0;
- /* FIXME: What stops hidraw_table going NULL */
- struct hidraw *dev = hidraw_table[minor];
+ struct hidraw *dev;
void __user *user_arg = (void __user*) arg;
- lock_kernel();
+ mutex_lock(&minors_lock);
+ dev = hidraw_table[minor];
+
switch (cmd) {
case HIDIOCGRDESCSIZE:
if (put_user(dev->hid->rsize, (int __user *)arg))
@@ -315,7 +319,7 @@ static long hidraw_ioctl(struct file *file, unsigned int cmd,
ret = -ENOTTY;
}
- unlock_kernel();
+ mutex_unlock(&minors_lock);
return ret;
}
diff --git a/drivers/hid/usbhid/hid-core.c b/drivers/hid/usbhid/hid-core.c
index a2ebe1996740..ca3751fd4473 100644
--- a/drivers/hid/usbhid/hid-core.c
+++ b/drivers/hid/usbhid/hid-core.c
@@ -1313,6 +1313,11 @@ static int hid_suspend(struct usb_interface *intf, pm_message_t message)
{
set_bit(HID_REPORTED_IDLE, &usbhid->iofl);
spin_unlock_irq(&usbhid->lock);
+ if (hid->driver && hid->driver->suspend) {
+ status = hid->driver->suspend(hid, message);
+ if (status < 0)
+ return status;
+ }
} else {
usbhid_mark_busy(usbhid);
spin_unlock_irq(&usbhid->lock);
@@ -1320,6 +1325,11 @@ static int hid_suspend(struct usb_interface *intf, pm_message_t message)
}
} else {
+ if (hid->driver && hid->driver->suspend) {
+ status = hid->driver->suspend(hid, message);
+ if (status < 0)
+ return status;
+ }
spin_lock_irq(&usbhid->lock);
set_bit(HID_REPORTED_IDLE, &usbhid->iofl);
spin_unlock_irq(&usbhid->lock);
@@ -1374,6 +1384,11 @@ static int hid_resume(struct usb_interface *intf)
hid_io_error(hid);
usbhid_restart_queues(usbhid);
+ if (status >= 0 && hid->driver && hid->driver->resume) {
+ int ret = hid->driver->resume(hid);
+ if (ret < 0)
+ status = ret;
+ }
dev_dbg(&intf->dev, "resume status %d\n", status);
return 0;
}
@@ -1382,9 +1397,16 @@ static int hid_reset_resume(struct usb_interface *intf)
{
struct hid_device *hid = usb_get_intfdata(intf);
struct usbhid_device *usbhid = hid->driver_data;
+ int status;
clear_bit(HID_REPORTED_IDLE, &usbhid->iofl);
- return hid_post_reset(intf);
+ status = hid_post_reset(intf);
+ if (status >= 0 && hid->driver && hid->driver->reset_resume) {
+ int ret = hid->driver->reset_resume(hid);
+ if (ret < 0)
+ status = ret;
+ }
+ return status;
}
#endif /* CONFIG_PM */
diff --git a/drivers/hid/usbhid/hiddev.c b/drivers/hid/usbhid/hiddev.c
index 433602aed468..c24d2fa3e3b6 100644
--- a/drivers/hid/usbhid/hiddev.c
+++ b/drivers/hid/usbhid/hiddev.c
@@ -267,6 +267,7 @@ static int hiddev_open(struct inode *inode, struct file *file)
struct hiddev_list *list;
int res, i;
+ /* See comment in hiddev_connect() for BKL explanation */
lock_kernel();
i = iminor(inode) - HIDDEV_MINOR_BASE;
@@ -894,8 +895,22 @@ int hiddev_connect(struct hid_device *hid, unsigned int force)
hiddev->hid = hid;
hiddev->exist = 1;
- /* when lock_kernel() usage is fixed in usb_open(),
- * we could also fix it here */
+ /*
+ * BKL here is used to avoid race after usb_register_dev().
+ * Once the device node has been created, open() could happen on it.
+ * The code below will then fail, as hiddev_table hasn't been
+ * updated.
+ *
+ * The obvious fix -- introducing mutex to guard hiddev_table[]
+ * doesn't work, as usb_open() and usb_register_dev() both take
+ * minor_rwsem, thus we'll have ABBA deadlock.
+ *
+ * Before BKL pushdown, usb_open() had been acquiring it in right
+ * order, so _open() was safe to use it to protect from this race.
+ * Now the order is different, but AB-BA deadlock still doesn't occur
+ * as BKL is dropped on schedule() (i.e. while sleeping on
+ * minor_rwsem). Fugly.
+ */
lock_kernel();
retval = usb_register_dev(usbhid->intf, &hiddev_class);
if (retval) {
diff --git a/include/linux/hid.h b/include/linux/hid.h
index f1f2b6f0d1c4..895001f7f4b2 100644
--- a/include/linux/hid.h
+++ b/include/linux/hid.h
@@ -591,6 +591,9 @@ struct hid_usage_id {
* @report_fixup: called before report descriptor parsing (NULL means nop)
* @input_mapping: invoked on input registering before mapping an usage
* @input_mapped: invoked on input registering after mapping an usage
+ * @suspend: invoked on suspend (NULL means nop)
+ * @resume: invoked on resume if device was not reset (NULL means nop)
+ * @reset_resume: invoked on resume if device was reset (NULL means nop)
*
* raw_event and event should return 0 on no action performed, 1 when no
* further processing should be done and negative on error
@@ -631,6 +634,11 @@ struct hid_driver {
int (*input_mapped)(struct hid_device *hdev,
struct hid_input *hidinput, struct hid_field *field,
struct hid_usage *usage, unsigned long **bit, int *max);
+#ifdef CONFIG_PM
+ int (*suspend)(struct hid_device *hdev, pm_message_t message);
+ int (*resume)(struct hid_device *hdev);
+ int (*reset_resume)(struct hid_device *hdev);
+#endif
/* private: */
struct device_driver driver;
};
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-22 07:07:18 +0100