linux-kernel - Re: [PATCH v4 7/8] DMA: Freescale: use spin_lock_bh instead of spin_lock

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Message-ID: <5365FCF2.9090008@freescale.com>
Date:	Sun, 4 May 2014 16:40:18 +0800
From:	Hongbo Zhang <hongbo.zhang@...escale.com>
To:	Vinod Koul <vinod.koul@...el.com>
CC:	<vkoul@...radead.org>, <dan.j.williams@...el.com>,
	<dmaengine@...r.kernel.org>, <scottwood@...escale.com>,
	<leo.li@...escale.com>, <linuxppc-dev@...ts.ozlabs.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 7/8] DMA: Freescale: use spin_lock_bh instead of spin_lock_irqsave


On 05/03/2014 12:51 AM, Vinod Koul wrote:
> On Fri, Apr 18, 2014 at 04:17:50PM +0800, hongbo.zhang@...escale.com wrote:
>> From: Hongbo Zhang <hongbo.zhang@...escale.com>
>>
>> The usage of spin_lock_irqsave() is a stronger locking mechanism than is
>> required throughout the driver. The minimum locking required should be used
>> instead. Interrupts will be turned off and context will be saved, it is
>> unnecessary to use irqsave.
>>
>> This patch changes all instances of spin_lock_irqsave() to spin_lock_bh(). All
>> manipulation of protected fields is done using tasklet context or weaker, which
>> makes spin_lock_bh() the correct choice.
>>
> This doesnt apply, perhpas due to depends on 6/8
>
So let's wait for the review result of 6/8.


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