[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 (file)
--- a/drivers/usb/storage/transport.c
+++ b/drivers/usb/storage/transport.c
@@ -115,19 +115,6 @@ static void usb_stor_blocking_completion(struct urb *urb, struct pt_regs *regs)
 
        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 void timeout_handler(unsigned long us_)
 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 @@ static int usb_stor_msg_common(struct us_data *us, int timeout)
                }
        }
  
-       /* 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;