RE: [PATCH] i2c: tegra: fix possible race condition after tx

From: Stephen Warren
Date: Thu Aug 11 2011 - 16:54:54 EST

Doug Anderson wrote at Thursday, August 11, 2011 2:19 PM:
> In tegra_i2c_fill_tx_fifo, once we have finished pushing all the bytes
> to the I2C hardware controller, the interrupt might happen before we
> have updated i2c_dev->msg_buf_remaining at the end of the function.
> Then, in tegra_i2c_isr, we will call again tegra_i2c_fill_tx_fifo
> triggering weird behaviour. This has been shown to happen under real
> conditions.
> Signed-off-by: Doug Anderson <dianders@xxxxxxxxxxxx>

Acked-by: Stephen Warren <swarren@xxxxxxxxxx>

It's worth pointing out that this patch supersedes a previous attempt to fix
the same problem, originally posted in,
if I'm understanding correctly.


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