linux-kernel - [PATCH v2] uas: replace WARN_ON_ONCE() with lockdep_assert

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Message-ID: <1407823717-17265-1-git-send-email-sanjeev_sharma@mentor.com>
Date:	Tue, 12 Aug 2014 11:38:37 +0530
From:	Sanjeev Sharma <sanjeev_sharma@...tor.com>
To:	<hdegoede@...hat.com>
CC:	<gregkh@...uxfoundation.org>, <kraxel@...hat.com>,
	<mdharm-usb@...-eyed-alien.net>, <linux-usb@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-scsi@...r.kernel.org>,
	Sanjeev Sharma <sanjeev_sharma@...tor.com>,
	Sanjeev Sharma <Sanjeev_Sharma@...tor.com>
Subject: [PATCH v2] uas: replace WARN_ON_ONCE() with lockdep_assert_held()

spin_is_locked() always return false in uniprocessor configuration and therefore it
would be advise to replace with lockdep_assert_held().

Signed-off-by: Sanjeev Sharma <Sanjeev_Sharma@...tor.com>
---
Changes in v2:
 - replaced WARN_ON_ONCE() with lockdep_assert_held() to
 avoid runtime overhead instead of assert_spin_locked()

 drivers/usb/storage/uas.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/usb/storage/uas.c b/drivers/usb/storage/uas.c
index 3f42785..05b2d8e 100644
--- a/drivers/usb/storage/uas.c
+++ b/drivers/usb/storage/uas.c
@@ -154,7 +154,7 @@ static void uas_mark_cmd_dead(struct uas_dev_info *devinfo,
 	struct scsi_cmnd *cmnd = container_of(scp, struct scsi_cmnd, SCp);
 
 	uas_log_cmd_state(cmnd, caller);
-	WARN_ON_ONCE(!spin_is_locked(&devinfo->lock));
+	lockdep_assert_held(&devinfo->lock);
 	WARN_ON_ONCE(cmdinfo->state & COMMAND_ABORTED);
 	cmdinfo->state |= COMMAND_ABORTED;
 	cmdinfo->state &= ~IS_IN_WORK_LIST;
@@ -181,7 +181,7 @@ static void uas_add_work(struct uas_cmd_info *cmdinfo)
 	struct scsi_cmnd *cmnd = container_of(scp, struct scsi_cmnd, SCp);
 	struct uas_dev_info *devinfo = cmnd->device->hostdata;
 
-	WARN_ON_ONCE(!spin_is_locked(&devinfo->lock));
+	lockdep_assert_held(&devinfo->lock);
 	cmdinfo->state |= IS_IN_WORK_LIST;
 	schedule_work(&devinfo->work);
 }
@@ -283,7 +283,7 @@ static int uas_try_complete(struct scsi_cmnd *cmnd, const char *caller)
 	struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 	struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
 
-	WARN_ON_ONCE(!spin_is_locked(&devinfo->lock));
+	lockdep_assert_held(&devinfo->lock);
 	if (cmdinfo->state & (COMMAND_INFLIGHT |
 			      DATA_IN_URB_INFLIGHT |
 			      DATA_OUT_URB_INFLIGHT |
@@ -622,7 +622,7 @@ static int uas_submit_urbs(struct scsi_cmnd *cmnd,
 	struct urb *urb;
 	int err;
 
-	WARN_ON_ONCE(!spin_is_locked(&devinfo->lock));
+	lockdep_assert_held(&devinfo->lock);
 	if (cmdinfo->state & SUBMIT_STATUS_URB) {
 		urb = uas_submit_sense_urb(cmnd, gfp, cmdinfo->stream);
 		if (!urb)
-- 
1.7.11.7

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