[PATCH 3.12 23/84] HID: usbhid: Fix the check for HID_RESET_PENDING in hid_io_error

From: Jiri Slaby
Date: Fri Oct 02 2015 - 09:49:16 EST


From: Don Zickus <dzickus@xxxxxxxxxx>

3.12-stable review patch. If anyone has any objections, please let me know.

===============

commit 3af4e5a95184d6d3c1c6a065f163faa174a96a1d upstream.

It was reported that after 10-20 reboots, a usb keyboard plugged
into a docking station would not work unless it was replugged in.

Using usbmon, it turns out the interrupt URBs were streaming with
callback errors of -71 for some reason. The hid-core.c::hid_io_error was
supposed to retry and then reset, but the reset wasn't really happening.

The check for HID_NO_BANDWIDTH was inverted. Fix was simple.

Tested by reporter and locally by me by unplugging a keyboard halfway until I
could recreate a stream of errors but no disconnect.

Signed-off-by: Don Zickus <dzickus@xxxxxxxxxx>
Signed-off-by: Jiri Kosina <jkosina@xxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
---
drivers/hid/usbhid/hid-core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/hid/usbhid/hid-core.c b/drivers/hid/usbhid/hid-core.c
index bcc3193d297c..f44be51e261d 100644
--- a/drivers/hid/usbhid/hid-core.c
+++ b/drivers/hid/usbhid/hid-core.c
@@ -180,7 +180,7 @@ static void hid_io_error(struct hid_device *hid)
if (time_after(jiffies, usbhid->stop_retry)) {

/* Retries failed, so do a port reset unless we lack bandwidth*/
- if (test_bit(HID_NO_BANDWIDTH, &usbhid->iofl)
+ if (!test_bit(HID_NO_BANDWIDTH, &usbhid->iofl)
&& !test_and_set_bit(HID_RESET_PENDING, &usbhid->iofl)) {

schedule_work(&usbhid->reset_work);
--
2.6.0

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