linux-kernel - Re: [PATCH 4/7] ide: ide_hwgroup_t.rq doesn't need an ide

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Date:	Fri, 10 Oct 2008 10:34:28 +0200
From:	Elias Oltmanns <eo@...ensachen.de>
To:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Cc:	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/7] ide: ide_hwgroup_t.rq doesn't need an ide_lock held

Bartlomiej Zolnierkiewicz <bzolnier@...il.com> wrote:
> From: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
> Subject: [PATCH] ide: ide_hwgroup_t.rq doesn't need an ide_lock held
>
> While at it:
> - no need to check for hwgroup presence in ide_dump_opcode()
>
> Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
> ---
[...]
> Index: b/drivers/ide/ide-io.c
> ===================================================================
> --- a/drivers/ide/ide-io.c
> +++ b/drivers/ide/ide-io.c
[...]
> @@ -274,7 +269,11 @@ static void ide_complete_pm_request (ide
>  		drive->dev_flags &= ~IDE_DFLAG_BLOCKED;
>  		blk_start_queue(drive->queue);
>  	}
> -	HWGROUP(drive)->rq = NULL;
> +	spin_unlock_irqrestore(&ide_lock, flags);
> +
> +	drive->hwif->hwgroup->rq = NULL;
> +
> +	spin_lock_irqsave(&ide_lock, flags);
>  	if (__blk_end_request(rq, 0, 0))
>  		BUG();
>  	spin_unlock_irqrestore(&ide_lock, flags);

Is it really an improvement to release the lock here?

Regards,

Elias
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