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Input: wacom - fix runtime PM related deadlock

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When runtime PM is enabled by default for input devices, X hangs in
wacom open:
[<ffffffff814a00ea>] mutex_lock+0x1a/0x40
[<ffffffffa02bc94b>] wacom_resume+0x3b/0x90 [wacom]
[<ffffffff81327a32>] usb_resume_interface+0xd2/0x190
[<ffffffff81327b5d>] usb_resume_both+0x6d/0x110
[<ffffffff81327c24>] usb_runtime_resume+0x24/0x40
[<ffffffff8130a2cf>] __pm_runtime_resume+0x26f/0x450
[<ffffffff8130a23a>] __pm_runtime_resume+0x1da/0x450
[<ffffffff8130a53a>] pm_runtime_resume+0x2a/0x50
[<ffffffff81328176>] usb_autopm_get_interface+0x26/0x60
[<ffffffffa02bc626>] wacom_open+0x36/0x90 [wacom]

wacom_open() takes wacom->lock and calls usb_autopm_get_interface(),
which in turn calls wacom_resume() which tries to acquire the lock
again.

The fix is to call usb_autopm_get_interface() first, before we take
the lock.

Since we do not do usb_autopm_put_interface() until wacom_close()
is called runtime PM is effectively disabled for the driver, however
changing it now would risk regressions so the complete fix will
have to wait till the next merge window.

Reported-by: Jiri Slaby <jslaby@suse.cz>
Acked-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Dmitry Torokhov 2010-10-04 21:46:11 -07:00
parent d2520a426d
commit f6cd378372
1 changed files with 12 additions and 11 deletions
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23
drivers/input/tablet/wacom_sys.c
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@ -103,27 +103,26 @@ static void wacom_sys_irq(struct urb *urb)
static int wacom_open(struct input_dev *dev)
{
struct wacom *wacom = input_get_drvdata(dev);
int retval = 0;
if (usb_autopm_get_interface(wacom->intf) < 0)
return -EIO;
mutex_lock(&wacom->lock);
wacom->irq->dev = wacom->usbdev;
if (usb_autopm_get_interface(wacom->intf) < 0) {
mutex_unlock(&wacom->lock);
return -EIO;
}
if (usb_submit_urb(wacom->irq, GFP_KERNEL)) {
usb_autopm_put_interface(wacom->intf);
mutex_unlock(&wacom->lock);
return -EIO;
retval = -EIO;
goto out;
}
wacom->open = true;
wacom->intf->needs_remote_wakeup = 1;
out:
mutex_unlock(&wacom->lock);
return 0;
if (retval)
usb_autopm_put_interface(wacom->intf);
return retval;
}
static void wacom_close(struct input_dev *dev)
@ -135,6 +134,8 @@ static void wacom_close(struct input_dev *dev)
wacom->open = false;
wacom->intf->needs_remote_wakeup = 0;
mutex_unlock(&wacom->lock);
usb_autopm_put_interface(wacom->intf);
}
static int wacom_parse_hid(struct usb_interface *intf, struct hid_descriptor *hid_desc,