Hi,
On Wed, Mar 02 2011, Michael Buesch wrote:
> Either OMAP_MMC_STAT_CARD_ERR or OMAP_MMC_STAT_END_OF_CMD might
> fire if there is no host->cmd pointer.
> Check for a valid host->cmd pointer before calling mmc_omap_cmd_done().
>
> Signed-off-by: Michael Buesch <mb@xxxxxxxxx>
> Acked-by: Tony Lindgren <tony@xxxxxxxxxxx>
>
> ---
>
> Fixes
>
> [ 3.814483] Unable to handle kernel NULL pointer dereference at virtual address 00000018
> ...
> [ 3.841247] CPU: 0 Not tainted (2.6.38-rc6 #5)
> [ 3.846374] PC is at mmc_omap_cmd_done+0x1c/0x154
> [ 3.851379] LR is at mmc_omap_cmd_done+0x1c/0x154
> ...
> [ 4.140014] [<c0234af0>] (mmc_omap_cmd_done+0x1c/0x154) from [<c0234ea4>] (mmc_omap_irq+0x27c/0x32c)
> [ 4.149749] [<c0234ea4>] (mmc_omap_irq+0x27c/0x32c) from [<c008645c>] (handle_IRQ_event+0x24/0xe4)
> [ 4.159332] [<c008645c>] (handle_IRQ_event+0x24/0xe4) from [<c0087dac>] (handle_level_irq+0xbc/0x13c)
> [ 4.169158] [<c0087dac>] (handle_level_irq+0xbc/0x13c) from [<c002b070>] (asm_do_IRQ+0x70/0x94)
> [ 4.178466] [<c002b070>] (asm_do_IRQ+0x70/0x94) from [<c003016c>] (__irq_svc+0x4c/0xb8)
>
>
> Index: linux-omap-2.6/drivers/mmc/host/omap.c
> ===================================================================
> --- linux-omap-2.6.orig/drivers/mmc/host/omap.c 2011-02-27 12:32:03.051061690 +0100
> +++ linux-omap-2.6/drivers/mmc/host/omap.c 2011-02-27 12:32:27.622530875 +0100
> @@ -832,7 +832,7 @@
> return IRQ_HANDLED;
> }
>
> - if (end_command)
> + if (end_command && host->cmd)
> mmc_omap_cmd_done(host, host->cmd);
> if (host->data != NULL) {
> if (transfer_error)
>
>
Thanks, pushed to mmc-next.
- Chris.
--
Chris Ball <cjb@xxxxxxxxxx> <http://printf.net/>
One Laptop Per Child
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