From 85f46fbf5e242ef923fd313722e65cb6d2170149 Mon Sep 17 00:00:00 2001 From: Marcus Folkesson Date: Sat, 17 Mar 2018 10:54:13 -0700 Subject: Input: usbtouchscreen - do not rely on input_dev->users If the device is unused and suspended, a call to open will cause the device to autoresume through the call to usb_autopm_get_interface(). input_dev->users is already incremented by the input subsystem, therefore this expression will always be evaluated to true: if (input->users || usbtouch->type->irq_always) result = usb_submit_urb(usbtouch->irq, GFP_NOIO); The same URB will then be fail when resubmitted in usbtouch_open(). Introduce usbtouch->is_open to keep track of the state instead. Signed-off-by: Marcus Folkesson Signed-off-by: Dmitry Torokhov --- drivers/input/touchscreen/usbtouchscreen.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) (limited to 'drivers/input/touchscreen/usbtouchscreen.c') diff --git a/drivers/input/touchscreen/usbtouchscreen.c b/drivers/input/touchscreen/usbtouchscreen.c index d15a7e2d9bbf..c6cf90868503 100644 --- a/drivers/input/touchscreen/usbtouchscreen.c +++ b/drivers/input/touchscreen/usbtouchscreen.c @@ -109,6 +109,7 @@ struct usbtouch_usb { struct input_dev *input; struct usbtouch_device_info *type; struct mutex pm_mutex; /* serialize access to open/suspend */ + bool is_open; char name[128]; char phys[64]; void *priv; @@ -1461,6 +1462,7 @@ static int usbtouch_open(struct input_dev *input) } usbtouch->interface->needs_remote_wakeup = 1; + usbtouch->is_open = true; out_put: mutex_unlock(&usbtouch->pm_mutex); usb_autopm_put_interface(usbtouch->interface); @@ -1476,6 +1478,7 @@ static void usbtouch_close(struct input_dev *input) mutex_lock(&usbtouch->pm_mutex); if (!usbtouch->type->irq_always) usb_kill_urb(usbtouch->irq); + usbtouch->is_open = false; mutex_unlock(&usbtouch->pm_mutex); r = usb_autopm_get_interface(usbtouch->interface); @@ -1497,11 +1500,10 @@ static int usbtouch_suspend static int usbtouch_resume(struct usb_interface *intf) { struct usbtouch_usb *usbtouch = usb_get_intfdata(intf); - struct input_dev *input = usbtouch->input; int result = 0; mutex_lock(&usbtouch->pm_mutex); - if (input->users || usbtouch->type->irq_always) + if (usbtouch->is_open || usbtouch->type->irq_always) result = usb_submit_urb(usbtouch->irq, GFP_NOIO); mutex_unlock(&usbtouch->pm_mutex); @@ -1511,7 +1513,6 @@ static int usbtouch_resume(struct usb_interface *intf) static int usbtouch_reset_resume(struct usb_interface *intf) { struct usbtouch_usb *usbtouch = usb_get_intfdata(intf); - struct input_dev *input = usbtouch->input; int err = 0; /* reinit the device */ @@ -1527,7 +1528,7 @@ static int usbtouch_reset_resume(struct usb_interface *intf) /* restart IO if needed */ mutex_lock(&usbtouch->pm_mutex); - if (input->users) + if (usbtouch->is_open) err = usb_submit_urb(usbtouch->irq, GFP_NOIO); mutex_unlock(&usbtouch->pm_mutex); -- cgit v1.2.3-59-g8ed1b