[PATCH] [PATCH] drm/i915: Fix race condition in accessing GMBUS

Ben Widawsky ben at bwidawsk.net
Mon Feb 13 01:04:41 PST 2012

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 at 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?


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