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mmc: dw_mmc: Don't crash if we get an interrupt before slot has initted 

It's unlikely that this is really needed on any single-slot systems
where we disable card detects until the end of probe, but it still
seems safer to check to make sure that a slot has been initted before
we try to dereference it to find the SDIO interrupt mask.

Signed-off-by: Doug Anderson <dianders@chromium.org>
Tested-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Doug Anderson 2015-02-25 10:11:52 -08:00 committed by Ulf Hansson
parent fa0c328343
commit ed2540effa
1 changed files with 4 additions and 0 deletions
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4
drivers/mmc/host/dw_mmc.c
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@ -2217,6 +2217,10 @@ static irqreturn_t dw_mci_interrupt(int irq, void *dev_id)
/* Handle SDIO Interrupts */ /* Handle SDIO Interrupts */
for (i = 0; i < host->num_slots; i++) { for (i = 0; i < host->num_slots; i++) {
struct dw_mci_slot *slot = host->slot[i]; struct dw_mci_slot *slot = host->slot[i];
if (!slot)
continue;
if (pending & SDMMC_INT_SDIO(slot->sdio_id)) { if (pending & SDMMC_INT_SDIO(slot->sdio_id)) {
mci_writel(host, RINTSTS, mci_writel(host, RINTSTS,
SDMMC_INT_SDIO(slot->sdio_id)); SDMMC_INT_SDIO(slot->sdio_id));