On Tue, Dec 7, 2010 at 5:27 PM, Paul Walmsley <paul@xxxxxxxxx> wrote:
>
> In the OMAP HSMMC driver, the code path entered via mmc_host_enable() can
> include register accesses to the HSMMC IP block. For this to work, both
> the device interface clock and functional clock need to be enabled before
> mmc_host_enable() is called. However, omap_hsmmc_probe() calls
> mmc_host_enable() before enabling the device interface clock. This can
> crash the kernel with:
>
> Unhandled fault: external abort on non-linefetch (0x1028) at 0xfa09c014
>
> Fix by calling mmc_host_enable() after the device interface clock is
> enabled.
>
> Signed-off-by: Paul Walmsley <paul@xxxxxxxxx>
> Cc: Madhusudhan Chikkature Rajashekar <madhu.cr@xxxxxx>
> Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>
> Cc: Kishore Kadiyala <kishore.kadiyala@xxxxxx>
> Cc: Tero Kristo <Tero.Kristo@xxxxxxxxx>
> ---
Acked-by: Madhusudhan Chikkature <madhu.cr@xxxxxx>
> drivers/mmc/host/omap_hsmmc.c | 6 +++---
> 1 files changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
> index 5d46021..58a2c5e 100644
> --- a/drivers/mmc/host/omap_hsmmc.c
> +++ b/drivers/mmc/host/omap_hsmmc.c
> @@ -2101,14 +2101,14 @@ static int __init omap_hsmmc_probe(struct platform_device *pdev)
> /* we start off in DISABLED state */
> host->dpm_state = DISABLED;
>
> - if (mmc_host_enable(host->mmc) != 0) {
> + if (clk_enable(host->iclk) != 0) {
> clk_put(host->iclk);
> clk_put(host->fclk);
> goto err1;
> }
>
> - if (clk_enable(host->iclk) != 0) {
> - mmc_host_disable(host->mmc);
> + if (mmc_host_enable(host->mmc) != 0) {
> + clk_disable(host->iclk);
> clk_put(host->iclk);
> clk_put(host->fclk);
> goto err1;
> --
> 1.7.2.3
>
>
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