From: Ben Widawsky <ben@bwidawsk.net>
To: Yufeng Shen <miletus@chromium.org>
Cc: linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
Eugeni Dodonov <eugeni.dodonov@intel.com>
Subject: Re: [PATCH] [PATCH] drm/i915: Fix race condition in accessing GMBUS
Date: Mon, 13 Feb 2012 10:04:41 +0100 [thread overview]
Message-ID: <20120213090440.GA11414@seagal.ffwll.local> (raw)
In-Reply-To: <1328896201-20909-1-git-send-email-miletus@chromium.org>
On Fri, Feb 10, 2012 at 12:50:01PM -0500, Yufeng Shen wrote:
> GMBUS has several ports and each has it's own corresponding
> I2C adpater. When multiple I2C adapters call gmbus_xfer() at
> the same time there is a race condition in using the underlying
> GMBUS controller. Fixing this by adding a mutex lock when calling
> gmbus_xfer().
>
> Signed-off-by: Yufeng Shen <miletus@chromium.org>
I do not see the race. All the i2c transfers should be protected
correctly by the i2c core, or else I think we haven't registered our
device properly. Could you give an example of when/how this can happen?
Ben
next prev parent reply other threads:[~2012-02-13 9:12 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-09 22:14 [PATCH] drm/i915: Fix race condition in accessing GMBUS Yufeng Shen
2012-02-10 17:17 ` Daniel Vetter
2012-02-10 17:50 ` [PATCH] " Yufeng Shen
2012-02-13 9:04 ` Ben Widawsky [this message]
2012-02-13 21:38 ` Yufeng Shen
2012-02-13 20:31 ` Daniel Vetter
2012-02-13 22:35 ` y
2012-02-13 22:36 ` Yufeng Shen
2012-02-14 9:47 ` Daniel Vetter
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