[PATCH V2 1/2] mmc: sdhci-esdhc-imx: fix access hardirq-unsafe lock in atomic context

[Shawn Guo]

On Thu, Dec 26, 2013 at 03:23:53PM +0800, Dong Aisheng wrote:
> Sometimes we may meet the following lockdep issue.
> The root cause is .set_clock callback is executed with spin_lock_irqsave
> in sdhci_do_set_ios. However, the IMX set_clock callback will try to access
> clk_get_rate which is using a mutex lock.
> 
> The fix avoids access mutex in .set_clock callback by initializing the
> pltfm_host->clock at probe time and use it later instead of calling
> clk_get_rate again in atomic context.

<snip>

> Cc: Chris Ball <cjb at laptop.org>
> Cc: Fabio Estevam <fabio.estevam at freescale.com>
> Cc: Shawn Guo <shawn.guo at linaro.org>

For both,

Acked-by: Shawn Guo <shawn.guo at linaro.org>

> Fixes: 0ddf03c mmc: esdhc-imx: parse max-frequency from devicetree
> Signed-off-by: Dong Aisheng <b29396 at freescale.com>