linux-kernel - Re: [PATCH] scsi: debug: fix type mismatch warning for sg_pcopy_from

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Message-ID: <10573000.xg2bp6EQuX@wuerfel>
Date:	Thu, 21 May 2015 13:28:55 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Dave Gordon <david.s.gordon@...el.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Akinobu Mita <akinobu.mita@...il.com>,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	jbottomley@...n.com
Subject: Re: [PATCH] scsi: debug: fix type mismatch warning for sg_pcopy_from_buffer

On Thursday 21 May 2015 12:09:58 Dave Gordon wrote:
> From b304c5a99ea260eac1cf98ced5f3c79c793ad4fd Mon Sep 17 00:00:00 2001
> From: Dave Gordon <david.s.gordon@...el.com>
> Date: Thu, 21 May 2015 12:06:27 +0100
> Subject: [PATCH] scsi: resolve sg buffer const-ness issue
> 
> do_device_access() takes a separate parameter to indicate the direction
> of data transfer, which it used to use to select the appropriate function
> out of sg_pcopy_{to,from}_buffer(). However these two functions now have
> different const-ness in their signatures, leading to compiler warnings.
> 
> So this patch makes it bypass these wrappers and call the underlying
> function sg_copy_buffer() directly; this has the same calling style as
> do_device_access() i.e. a separate direction-of-transfer parameter and
> no pointers-to-const, so skipping the wrappers not only eliminates the
> warning, it also make the code simpler 
> 
> Signed-off-by: Dave Gordon <david.s.gordon@...el.com>
> ---

Acked-by: Arnd Bergmann <arnd@...db.de>
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