[PATCH 3.12 094/181] usb: usbtest: Add timetout to simple_io()

Jiri Slaby
2014-06-30T12:02:28Z

From: Roger Quadros <rogerq@ti.com>

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

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

commit e5e4746510d140261918aecce2e5e3aa4456f7e9 upstream.

Without a timetout some tests e.g. test_halt() can remain stuck forever.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Reviewed-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
drivers/usb/misc/usbtest.c | 14 +++++++++++---
1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/misc/usbtest.c b/drivers/usb/misc/usbtest.c
index aa28ac8c7607..afe616b55f01 100644
--- a/drivers/usb/misc/usbtest.c
+++ b/drivers/usb/misc/usbtest.c
@@ -10,6 +10,7 @@

#include <linux/usb.h>

+#define SIMPLE_IO_TIMEOUT 10000 /* in milliseconds */

/*-------------------------------------------------------------------------*/

@@ -366,6 +367,7 @@ static int simple_io(
int max = urb->transfer_buffer_length;
struct completion completion;
int retval = 0;
+ unsigned long expire;

urb->context = &completion;
while (retval == 0 && iterations-- > 0) {
@@ -378,9 +380,15 @@ static int simple_io(
if (retval != 0)
break;

- /* NOTE: no timeouts; can't be broken out of by interrupt */
- wait_for_completion(&completion);
- retval = urb->status;
+ expire = msecs_to_jiffies(SIMPLE_IO_TIMEOUT);
+ if (!wait_for_completion_timeout(&completion, expire)) {
+ usb_kill_urb(urb);
+ retval = (urb->status == -ENOENT ?
+ -ETIMEDOUT : urb->status);
+ } else {
+ retval = urb->status;
+ }
+
urb->dev = udev;
if (retval == 0 && usb_pipein(urb->pipe))
retval = simple_check_buf(tdev, urb);
--
2.0.0