diff options
| author | Chuansheng Liu <chuansheng.liu@intel.com> | 2013-11-05 14:52:45 +0800 |
|---|---|---|
| committer | Chris Ball <chris@printf.net> | 2014-01-13 12:48:13 -0500 |
| commit | 63c211803a272d59dcb11af82ad0364b3d1d2a2e (patch) | |
| tree | 5c0884f4ded5994df5a09501a3ec4be7058b1f3e /drivers/mmc | |
| parent | 00411135474264ce74310d2a7f7017885dd41545 (diff) | |
| download | linux-63c211803a272d59dcb11af82ad0364b3d1d2a2e.tar.bz2 | |
mmc: sdhci: Setting the host->mrq to NULL before executing tuning
In function sdhci_request(), it is possible to do the tuning execution
like below:
sdhci_request() {
spin_lock_irqsave(&host->lock, flags);
host->mrq = mrq;
...
spin_unlock_irqrestore(&host->lock, flags);
<=== Here it is possible one pending finish_tasklet get running
and it will operate the original mrq, and notified the mrq
is done, and causes memory corruption.
sdhci_execute_tuning(mmc, tuning_opcode);
spin_lock_irqsave(&host->lock, flags);
host->mrq = mrq;
...
}
In the above race place, the original mrq should not be finished wrongly,
so here before unlock the spinlock, we need to set the host->mrq to NULL
to avoid this case.
Signed-off-by: Liu, Chuansheng <chuansheng.liu@intel.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/host/sdhci.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index 6840322c12a0..cc00bed3e200 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -1396,6 +1396,13 @@ static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq) mmc->card->type == MMC_TYPE_MMC ? MMC_SEND_TUNING_BLOCK_HS200 : MMC_SEND_TUNING_BLOCK; + + /* Here we need to set the host->mrq to NULL, + * in case the pending finish_tasklet + * finishes it incorrectly. + */ + host->mrq = NULL; + spin_unlock_irqrestore(&host->lock, flags); sdhci_execute_tuning(mmc, tuning_opcode); spin_lock_irqsave(&host->lock, flags); |