Commit a016a816 authored by Alan Stern's avatar Alan Stern Committed by Greg Kroah-Hartman
Browse files

USB: add usbfs snooping for REAP and DISCARD 



This patch improves the usbfs_snoop debugging facility by adding
messages for a couple of significant events which, up to now, have not
been logged.  The events are reaping and discarding (i.e.,
cancelling) an URB.  The debugging messages include the userspace
address of the URB being reaped or discarded.

The reaping messages have to be added in four places, in order to
handle blocking and non-blocking reaps in both normal and 32-bit
compatibility mode.

Signed-off-by: default avatarAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 0290cc9f

drivers/usb/core/devio.c

+13 −3
Original line number Diff line number Diff line
@@ -1716,8 +1716,12 @@ static struct async *reap_as(struct usb_dev_state *ps) 
static int proc_reapurb(struct usb_dev_state *ps, void __user *arg)

{

	struct async *as = reap_as(ps);



	if (as) {

		int retval = processcompl(as, (void __user * __user *)arg);

		int retval;



		snoop(&ps->dev->dev, "reap %p\n", as->userurb);

		retval = processcompl(as, (void __user * __user *)arg);

		free_async(as);

		return retval;

	}
@@ -1733,6 +1737,7 @@ static int proc_reapurbnonblock(struct usb_dev_state *ps, void __user *arg) 


	as = async_getcompleted(ps);

	if (as) {

		snoop(&ps->dev->dev, "reap %p\n", as->userurb);

		retval = processcompl(as, (void __user * __user *)arg);

		free_async(as);

	} else {
@@ -1859,8 +1864,12 @@ static int processcompl_compat(struct async *as, void __user * __user *arg) 
static int proc_reapurb_compat(struct usb_dev_state *ps, void __user *arg)

{

	struct async *as = reap_as(ps);



	if (as) {

		int retval = processcompl_compat(as, (void __user * __user *)arg);

		int retval;



		snoop(&ps->dev->dev, "reap %p\n", as->userurb);

		retval = processcompl_compat(as, (void __user * __user *)arg);

		free_async(as);

		return retval;

	}
@@ -1876,6 +1885,7 @@ static int proc_reapurbnonblock_compat(struct usb_dev_state *ps, void __user *ar 


	as = async_getcompleted(ps);

	if (as) {

		snoop(&ps->dev->dev, "reap %p\n", as->userurb);

		retval = processcompl_compat(as, (void __user * __user *)arg);

		free_async(as);

	} else {
@@ -2280,7 +2290,7 @@ static long usbdev_do_ioctl(struct file *file, unsigned int cmd, 
#endif



	case USBDEVFS_DISCARDURB:

		snoop(&dev->dev, "%s: DISCARDURB\n", __func__);

		snoop(&dev->dev, "%s: DISCARDURB %p\n", __func__, p);

		ret = proc_unlinkurb(ps, p);

		break;

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