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uas: Avoid unnecessary unlock / lock calls around unlink_data_urbs

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All callers of unlink_data_urbs drop devinfo->lock before calling it, and
then immediately take it again after the call. And the first thing
unlink_data_urbs does is take the lock again, and the last thing it does
is drop it. This commit removes all the unnecessary lock dropping and taking.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
This commit is contained in:
Hans de Goede 2013-10-17 19:19:04 +02:00 committed by Sarah Sharp
parent 6ce8213b33
commit 7e50e0bec4
1 changed files with 7 additions and 13 deletions
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20
drivers/usb/storage/uas.c
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@ -93,28 +93,26 @@ static void uas_configure_endpoints(struct uas_dev_info *devinfo);
static void uas_free_streams(struct uas_dev_info *devinfo);
static void uas_log_cmd_state(struct scsi_cmnd *cmnd, const char *caller);
/* Must be called with devinfo->lock held, will temporary unlock the lock */
static void uas_unlink_data_urbs(struct uas_dev_info *devinfo,
struct uas_cmd_info *cmdinfo)
struct uas_cmd_info *cmdinfo,
unsigned long *lock_flags)
{
unsigned long flags;
/*
* The UNLINK_DATA_URBS flag makes sure uas_try_complete
* (called by urb completion) doesn't release cmdinfo
* underneath us.
*/
spin_lock_irqsave(&devinfo->lock, flags);
cmdinfo->state |= UNLINK_DATA_URBS;
spin_unlock_irqrestore(&devinfo->lock, flags);
spin_unlock_irqrestore(&devinfo->lock, *lock_flags);
if (cmdinfo->data_in_urb)
usb_unlink_urb(cmdinfo->data_in_urb);
if (cmdinfo->data_out_urb)
usb_unlink_urb(cmdinfo->data_out_urb);
spin_lock_irqsave(&devinfo->lock, flags);
spin_lock_irqsave(&devinfo->lock, *lock_flags);
cmdinfo->state &= ~UNLINK_DATA_URBS;
spin_unlock_irqrestore(&devinfo->lock, flags);
}
static void uas_do_work(struct work_struct *work)
@ -361,9 +359,7 @@ static void uas_stat_cmplt(struct urb *urb)
uas_sense(urb, cmnd);
if (cmnd->result != 0) {
/* cancel data transfers on error */
spin_unlock_irqrestore(&devinfo->lock, flags);
uas_unlink_data_urbs(devinfo, cmdinfo);
spin_lock_irqsave(&devinfo->lock, flags);
uas_unlink_data_urbs(devinfo, cmdinfo, &flags);
}
cmdinfo->state &= ~COMMAND_INFLIGHT;
uas_try_complete(cmnd, __func__);
@ -787,9 +783,7 @@ static int uas_eh_abort_handler(struct scsi_cmnd *cmnd)
spin_unlock_irqrestore(&devinfo->lock, flags);
ret = uas_eh_task_mgmt(cmnd, "ABORT TASK", TMF_ABORT_TASK);
} else {
spin_unlock_irqrestore(&devinfo->lock, flags);
uas_unlink_data_urbs(devinfo, cmdinfo);
spin_lock_irqsave(&devinfo->lock, flags);
uas_unlink_data_urbs(devinfo, cmdinfo, &flags);
uas_try_complete(cmnd, __func__);
spin_unlock_irqrestore(&devinfo->lock, flags);
ret = SUCCESS;