On Thu, Mar 15, 2012 at 12:04 AM, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote:
> Is there any way to reproduce this?
>
> It seems to be saying that usb_stor_pre_reset() was called twice
> without usb_stor_post_reset() being called in between, because the
> post_reset routine is where the lock gets released. I don't know of
> any way that could happen.
Looks it is a device with multiple usb mass interfaces, care to
post the 'lsusb -v' of the device?
If so, the following patch should remove the warning.
diff --git a/drivers/usb/storage/usb.c b/drivers/usb/storage/usb.c
index c18538e..1c209a0 100644
--- a/drivers/usb/storage/usb.c
+++ b/drivers/usb/storage/usb.c
@@ -194,11 +194,13 @@ EXPORT_SYMBOL_GPL(usb_stor_reset_resume);
int usb_stor_pre_reset(struct usb_interface *iface)
{
struct us_data *us = usb_get_intfdata(iface);
+ int if_num = (int)(iface -
+ us->pusb_dev->actconfig->interface[0]);
US_DEBUGP("%s\n", __func__);
/* Make sure no command runs during the reset */
- mutex_lock(&us->dev_mutex);
+ mutex_lock_nested(&us->dev_mutex, if_num);
return 0;
}
EXPORT_SYMBOL_GPL(usb_stor_pre_reset);
Thanks,
--
Ming Lei
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