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

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Message-ID: <53E9ACE9.4000608@redhat.com>
Date:	Tue, 12 Aug 2014 07:58:01 +0200
From:	Hans de Goede <hdegoede@...hat.com>
To:	Sanjeev Sharma <sanjeev_sharma@...tor.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
Subject: Re: [PATCH v2] uas: replace WARN_ON_ONCE() with lockdep_assert_held()

Hi,

On 08/12/2014 08:08 AM, Sanjeev Sharma wrote:
> 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()

Thanks!

Acked-by: Hans de Goede <hdegoede@...hat.com>

Regards,

Hans

> 
>  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)
> 
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