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USB: chaoskey: fix error case of a timeout

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commit 92aa5986f4f7b5a8bf282ca0f50967f4326559f5 upstream.

In case of a timeout or if a signal aborts a read
communication with the device needs to be ended
lest we overwrite an active URB the next time we
do IO to the device, as the URB may still be active.

Signed-off-by: Oliver Neukum <oneukum@suse.de>
Cc: stable <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20191107142856.16774-1-oneukum@suse.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Oliver Neukum 2019-11-07 15:28:55 +01:00 • committed by Greg Kroah-Hartman
commit 878389a536
1 changed files with 21 additions and 3 deletions
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24
drivers/usb/misc/chaoskey.c
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@ -384,13 +384,17 @@ static int _chaoskey_fill(struct chaoskey *dev)
!dev->reading,
(started ? NAK_TIMEOUT : ALEA_FIRST_TIMEOUT) );
if (result < 0)
if (result < 0) {
usb_kill_urb(dev->urb);
goto out;
}
if (result == 0)
if (result == 0) {
result = -ETIMEDOUT;
else
usb_kill_urb(dev->urb);
} else {
result = dev->valid;
}
out:
/* Let the device go back to sleep eventually */
usb_autopm_put_interface(dev->interface);
@ -526,7 +530,21 @@ static int chaoskey_suspend(struct usb_interface *interface,
static int chaoskey_resume(struct usb_interface *interface)
{
struct chaoskey *dev;
struct usb_device *udev = interface_to_usbdev(interface);
usb_dbg(interface, "resume");
dev = usb_get_intfdata(interface);
/*
* We may have lost power.
* In that case the device that needs a long time
* for the first requests needs an extended timeout
* again
*/
if (le16_to_cpu(udev->descriptor.idVendor) == ALEA_VENDOR_ID)
dev->reads_started = false;
return 0;
}
#else