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

[Stephen Warren]

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 https://lkml.org/lkml/2011/4/19/514,
if I'm understanding correctly.

-- 
nvpublic

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/