[PATCH] usb-storage: get rid of the timer during URB submission
This patch uses completion timeout instead of a timer to implement
a timeout when submitting an URB.
It also put the task in interruptible state instead of an
uninterruptible one while waiting for the completion.
Signed-off-by: Franck Bui-Huu <vagabon.xyz@gmail.com>
Signed-off-by: Matthew Dharm <mdharm-usb@one-eyed-alien.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/storage/transport.c b/drivers/usb/storage/transport.c
index 7ca896a..038f458 100644
--- a/drivers/usb/storage/transport.c
+++ b/drivers/usb/storage/transport.c
@@ -115,19 +115,6 @@
complete(urb_done_ptr);
}
-
-/* This is the timeout handler which will cancel an URB when its timeout
- * expires.
- */
-static void timeout_handler(unsigned long us_)
-{
- struct us_data *us = (struct us_data *) us_;
-
- if (test_and_clear_bit(US_FLIDX_URB_ACTIVE, &us->flags)) {
- US_DEBUGP("Timeout -- cancelling URB\n");
- usb_unlink_urb(us->current_urb);
- }
-}
/* This is the common part of the URB message submission code
*
@@ -138,7 +125,7 @@
static int usb_stor_msg_common(struct us_data *us, int timeout)
{
struct completion urb_done;
- struct timer_list to_timer;
+ long timeleft;
int status;
/* don't submit URBs during abort/disconnect processing */
@@ -185,22 +172,17 @@
}
}
- /* submit the timeout timer, if a timeout was requested */
- if (timeout > 0) {
- init_timer(&to_timer);
- to_timer.expires = jiffies + timeout;
- to_timer.function = timeout_handler;
- to_timer.data = (unsigned long) us;
- add_timer(&to_timer);
- }
-
/* wait for the completion of the URB */
- wait_for_completion(&urb_done);
- clear_bit(US_FLIDX_URB_ACTIVE, &us->flags);
+ timeleft = wait_for_completion_interruptible_timeout(
+ &urb_done, timeout ? : MAX_SCHEDULE_TIMEOUT);
- /* clean up the timeout timer */
- if (timeout > 0)
- del_timer_sync(&to_timer);
+ clear_bit(US_FLIDX_URB_ACTIVE, &us->flags);
+
+ if (timeleft <= 0) {
+ US_DEBUGP("%s -- cancelling URB\n",
+ timeleft == 0 ? "Timeout" : "Signal");
+ usb_unlink_urb(us->current_urb);
+ }
/* return the URB status */
return us->current_urb->status;