Commit 12e510db authored by Marcus Folkesson's avatar Marcus Folkesson Committed by Dmitry Torokhov

Input: usbtouchscreen - fix deadlock in autosuspend

usb_autopm_get_interface() that is called in usbtouch_open() does an
autoresume if the device is suspended.

input_dev->mutex used in usbtouch_resume() is in this case already
taken by the input subsystem and will cause a deadlock.
Signed-off-by: default avatarMarcus Folkesson <marcus.folkesson@gmail.com>
Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
parent 553d16af
...@@ -54,6 +54,7 @@ ...@@ -54,6 +54,7 @@
#include <linux/usb.h> #include <linux/usb.h>
#include <linux/usb/input.h> #include <linux/usb/input.h>
#include <linux/hid.h> #include <linux/hid.h>
#include <linux/mutex.h>
static bool swap_xy; static bool swap_xy;
module_param(swap_xy, bool, 0644); module_param(swap_xy, bool, 0644);
...@@ -107,6 +108,7 @@ struct usbtouch_usb { ...@@ -107,6 +108,7 @@ struct usbtouch_usb {
struct usb_interface *interface; struct usb_interface *interface;
struct input_dev *input; struct input_dev *input;
struct usbtouch_device_info *type; struct usbtouch_device_info *type;
struct mutex pm_mutex; /* serialize access to open/suspend */
char name[128]; char name[128];
char phys[64]; char phys[64];
void *priv; void *priv;
...@@ -1450,6 +1452,7 @@ static int usbtouch_open(struct input_dev *input) ...@@ -1450,6 +1452,7 @@ static int usbtouch_open(struct input_dev *input)
if (r < 0) if (r < 0)
goto out; goto out;
mutex_lock(&usbtouch->pm_mutex);
if (!usbtouch->type->irq_always) { if (!usbtouch->type->irq_always) {
if (usb_submit_urb(usbtouch->irq, GFP_KERNEL)) { if (usb_submit_urb(usbtouch->irq, GFP_KERNEL)) {
r = -EIO; r = -EIO;
...@@ -1459,6 +1462,7 @@ static int usbtouch_open(struct input_dev *input) ...@@ -1459,6 +1462,7 @@ static int usbtouch_open(struct input_dev *input)
usbtouch->interface->needs_remote_wakeup = 1; usbtouch->interface->needs_remote_wakeup = 1;
out_put: out_put:
mutex_unlock(&usbtouch->pm_mutex);
usb_autopm_put_interface(usbtouch->interface); usb_autopm_put_interface(usbtouch->interface);
out: out:
return r; return r;
...@@ -1469,8 +1473,11 @@ static void usbtouch_close(struct input_dev *input) ...@@ -1469,8 +1473,11 @@ static void usbtouch_close(struct input_dev *input)
struct usbtouch_usb *usbtouch = input_get_drvdata(input); struct usbtouch_usb *usbtouch = input_get_drvdata(input);
int r; int r;
mutex_lock(&usbtouch->pm_mutex);
if (!usbtouch->type->irq_always) if (!usbtouch->type->irq_always)
usb_kill_urb(usbtouch->irq); usb_kill_urb(usbtouch->irq);
mutex_unlock(&usbtouch->pm_mutex);
r = usb_autopm_get_interface(usbtouch->interface); r = usb_autopm_get_interface(usbtouch->interface);
usbtouch->interface->needs_remote_wakeup = 0; usbtouch->interface->needs_remote_wakeup = 0;
if (!r) if (!r)
...@@ -1493,10 +1500,10 @@ static int usbtouch_resume(struct usb_interface *intf) ...@@ -1493,10 +1500,10 @@ static int usbtouch_resume(struct usb_interface *intf)
struct input_dev *input = usbtouch->input; struct input_dev *input = usbtouch->input;
int result = 0; int result = 0;
mutex_lock(&input->mutex); mutex_lock(&usbtouch->pm_mutex);
if (input->users || usbtouch->type->irq_always) if (input->users || usbtouch->type->irq_always)
result = usb_submit_urb(usbtouch->irq, GFP_NOIO); result = usb_submit_urb(usbtouch->irq, GFP_NOIO);
mutex_unlock(&input->mutex); mutex_unlock(&usbtouch->pm_mutex);
return result; return result;
} }
...@@ -1519,10 +1526,10 @@ static int usbtouch_reset_resume(struct usb_interface *intf) ...@@ -1519,10 +1526,10 @@ static int usbtouch_reset_resume(struct usb_interface *intf)
} }
/* restart IO if needed */ /* restart IO if needed */
mutex_lock(&input->mutex); mutex_lock(&usbtouch->pm_mutex);
if (input->users) if (input->users)
err = usb_submit_urb(usbtouch->irq, GFP_NOIO); err = usb_submit_urb(usbtouch->irq, GFP_NOIO);
mutex_unlock(&input->mutex); mutex_unlock(&usbtouch->pm_mutex);
return err; return err;
} }
......
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