linux-kernel - Re: [PATCH] pch_gpio: transform mutex into spinlock

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Message-ID: <4E092814.1080701@dsn.okisemi.com>
Date:	Tue, 28 Jun 2011 10:02:12 +0900
From:	Tomoya MORINAGA <tomoya-linux@....okisemi.com>
To:	Grant Likely <grant.likely@...retlab.ca>
CC:	Alexander Stein <alexander.stein@...tec-electronic.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"toshiharu-linux@....okisemi.com" <toshiharu-linux@....okisemi.com>
Subject: Re: [PATCH] pch_gpio: transform mutex into spinlock

(2011/06/28 7:47), Grant Likely wrote:
> On Tue, Jun 21, 2011 at 04:17:27PM +0200, Alexander Stein wrote:
>> gpio_chip.can_sleep is 0, but gpio_set_value&  friends lock a mutex. Thus
>> those functions are not callable from interrupt context.
>> Changing mutex into spinlock.
>>
>> Signed-off-by: Alexander Stein<alexander.stein@...tec-electronic.com>
>
> Tomoya, what do you think of this patch?
>

Seeing some upstreamed GPIO driver, Alexander's comment looks right.

Best Regards,

tomoya
OKI SEMICONDUCTOR CO., LTD.
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