From: Arnd Bergmann <arnd@arndb.de>
To: "Lars-Peter Clausen" <lars@metafoo.de>
Cc: Jon Hunter <jon-hunter@ti.com>, Vinod Koul <vinod.koul@intel.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/2] dma:of: Use a mutex to protect the of_dma_list
Date: Sat, 20 Apr 2013 12:38:08 +0200 [thread overview]
Message-ID: <201304201238.08908.arnd@arndb.de> (raw)
In-Reply-To: <51724393.1060608@metafoo.de>
On Saturday 20 April 2013, Lars-Peter Clausen wrote:
> On 04/20/2013 12:45 AM, Jon Hunter wrote:
> > I think that there is a problem here. For controllers using the
> > of_dma_simple_xlate(), this will call dma_request_channel() which also
> > uses a mutex.
>
> That would only be a problem if it'd use the same mutex. Holding two mutexes at
> the same time is not a problem per se.
>
I guess Jon originlly tried it with a spinlock as the outer lock, which indeed
does not work, but the new version does not have this problem.
Arnd
next prev parent reply other threads:[~2013-04-20 10:38 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-19 9:42 [PATCH 1/2] dma: of: Fix of_node reference leak Lars-Peter Clausen
2013-04-19 9:42 ` [PATCH 2/2] dma:of: Use a mutex to protect the of_dma_list Lars-Peter Clausen
2013-04-19 10:13 ` Arnd Bergmann
2013-04-19 11:04 ` Lars-Peter Clausen
2013-04-19 12:25 ` Arnd Bergmann
2013-04-19 22:45 ` Jon Hunter
2013-04-19 23:13 ` Arnd Bergmann
2013-04-22 1:22 ` Jon Hunter
2013-04-20 7:28 ` Lars-Peter Clausen
2013-04-20 10:38 ` Arnd Bergmann [this message]
2013-04-22 1:18 ` Jon Hunter
2013-04-19 10:10 ` [PATCH 1/2] dma: of: Fix of_node reference leak Arnd Bergmann
2013-04-19 22:29 ` Jon Hunter
2013-05-02 16:24 ` Vinod Koul
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