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mfd: rtsx: Fix oops when rtsx_pci_sdmmc is not probed 

If rtsx_pci_sdmmc is not probed, function pointer pcr->slots[].card_event
will point to NULL, and thus rtsx_pci_card_detect will reference a NULL
pointer.
Check card_event pointer before referencing it can avoid kernel panic.

Signed-off-by: Wei WANG <wei_wang@realsil.com.cn>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Wei WANG 2013-01-27 01:55:16 +01:00 committed by Samuel Ortiz
parent ff0decd493
commit 2d1484f599
1 changed files with 2 additions and 2 deletions
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4
drivers/mfd/rtsx_pcr.c
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@ -786,10 +786,10 @@ static void rtsx_pci_card_detect(struct work_struct *work)
spin_unlock_irqrestore(&pcr->lock, flags);
if (card_detect & SD_EXIST)
if ((card_detect & SD_EXIST) && pcr->slots[RTSX_SD_CARD].card_event)
pcr->slots[RTSX_SD_CARD].card_event(
pcr->slots[RTSX_SD_CARD].p_dev);
if (card_detect & MS_EXIST)
if ((card_detect & MS_EXIST) && pcr->slots[RTSX_MS_CARD].card_event)
pcr->slots[RTSX_MS_CARD].card_event(
pcr->slots[RTSX_MS_CARD].p_dev);
}