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| author | Marcus Folkesson <marcus.folkesson@gmail.com> | 2018-03-17 18:51:34 +0100 |
|---|---|---|
| committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2018-03-17 19:05:18 +0100 |
| commit | 1f701f6d10a4578b7b2389fd80e4ef28aeb80057 (patch) | |
| tree | bc2ce8dd28d0ac146ecff798433e1ab746fde00a | |
| parent | Input: synaptics_usb - do not rely on input_dev->users (diff) | |
| download | linux-1f701f6d10a4578b7b2389fd80e4ef28aeb80057.tar.xz linux-1f701f6d10a4578b7b2389fd80e4ef28aeb80057.zip | |
Input: pagasus_notetaker - fix deadlock in autosuspend
usb_autopm_get_interface() that is called in pegasus_open() does an
autoresume if the device is suspended.
input_dev->mutex used in pegasus_resume() is in this case already
taken by the input subsystem and will cause a deadlock.
Signed-off-by: Marcus Folkesson <marcus.folkesson@gmail.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
| -rw-r--r-- | drivers/input/tablet/pegasus_notetaker.c | 25 |
1 files changed, 19 insertions, 6 deletions
diff --git a/drivers/input/tablet/pegasus_notetaker.c b/drivers/input/tablet/pegasus_notetaker.c index 47de5a81172f..9ab1ed5e20e7 100644 --- a/drivers/input/tablet/pegasus_notetaker.c +++ b/drivers/input/tablet/pegasus_notetaker.c @@ -41,6 +41,7 @@ #include <linux/usb/input.h> #include <linux/slab.h> #include <linux/workqueue.h> +#include <linux/mutex.h> /* USB HID defines */ #define USB_REQ_GET_REPORT 0x01 @@ -76,6 +77,10 @@ struct pegasus { struct usb_device *usbdev; struct usb_interface *intf; struct urb *irq; + + /* serialize access to open/suspend */ + struct mutex pm_mutex; + char name[128]; char phys[64]; struct work_struct init; @@ -216,6 +221,7 @@ static int pegasus_open(struct input_dev *dev) if (error) return error; + mutex_lock(&pegasus->pm_mutex); pegasus->irq->dev = pegasus->usbdev; if (usb_submit_urb(pegasus->irq, GFP_KERNEL)) { error = -EIO; @@ -226,12 +232,14 @@ static int pegasus_open(struct input_dev *dev) if (error) goto err_kill_urb; + mutex_unlock(&pegasus->pm_mutex); return 0; err_kill_urb: usb_kill_urb(pegasus->irq); cancel_work_sync(&pegasus->init); err_autopm_put: + mutex_unlock(&pegasus->pm_mutex); usb_autopm_put_interface(pegasus->intf); return error; } @@ -240,8 +248,11 @@ static void pegasus_close(struct input_dev *dev) { struct pegasus *pegasus = input_get_drvdata(dev); + mutex_lock(&pegasus->pm_mutex); usb_kill_urb(pegasus->irq); cancel_work_sync(&pegasus->init); + mutex_unlock(&pegasus->pm_mutex); + usb_autopm_put_interface(pegasus->intf); } @@ -274,6 +285,8 @@ static int pegasus_probe(struct usb_interface *intf, goto err_free_mem; } + mutex_init(&pegasus->pm_mutex); + pegasus->usbdev = dev; pegasus->dev = input_dev; pegasus->intf = intf; @@ -388,10 +401,10 @@ static int pegasus_suspend(struct usb_interface *intf, pm_message_t message) { struct pegasus *pegasus = usb_get_intfdata(intf); - mutex_lock(&pegasus->dev->mutex); + mutex_lock(&pegasus->pm_mutex); usb_kill_urb(pegasus->irq); cancel_work_sync(&pegasus->init); - mutex_unlock(&pegasus->dev->mutex); + mutex_unlock(&pegasus->pm_mutex); return 0; } @@ -401,10 +414,10 @@ static int pegasus_resume(struct usb_interface *intf) struct pegasus *pegasus = usb_get_intfdata(intf); int retval = 0; - mutex_lock(&pegasus->dev->mutex); + mutex_lock(&pegasus->pm_mutex); if (pegasus->dev->users && usb_submit_urb(pegasus->irq, GFP_NOIO) < 0) retval = -EIO; - mutex_unlock(&pegasus->dev->mutex); + mutex_unlock(&pegasus->pm_mutex); return retval; } @@ -414,14 +427,14 @@ static int pegasus_reset_resume(struct usb_interface *intf) struct pegasus *pegasus = usb_get_intfdata(intf); int retval = 0; - mutex_lock(&pegasus->dev->mutex); + mutex_lock(&pegasus->pm_mutex); if (pegasus->dev->users) { retval = pegasus_set_mode(pegasus, PEN_MODE_XY, NOTETAKER_LED_MOUSE); if (!retval && usb_submit_urb(pegasus->irq, GFP_NOIO) < 0) retval = -EIO; } - mutex_unlock(&pegasus->dev->mutex); + mutex_unlock(&pegasus->pm_mutex); return retval; } |