This is a note to let you know that I've just added the patch titled mmc: via-sdmmc: Fix data race bug to the 5.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: mmc-via-sdmmc-fix-data-race-bug.patch and it can be found in the queue-5.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 572eaabac066d032fd59a16a980b2c86cc7c643c Author: Madhuparna Bhowmik <madhuparnabhowmik10@xxxxxxxxx> Date: Sat Aug 22 11:45:28 2020 +0530 mmc: via-sdmmc: Fix data race bug [ Upstream commit 87d7ad089b318b4f319bf57f1daa64eb6d1d10ad ] via_save_pcictrlreg() should be called with host->lock held as it writes to pm_pcictrl_reg, otherwise there can be a race condition between via_sd_suspend() and via_sdc_card_detect(). The same pattern is used in the function via_reset_pcictrl() as well, where via_save_pcictrlreg() is called with host->lock held. Found by Linux Driver Verification project (linuxtesting.org). Signed-off-by: Madhuparna Bhowmik <madhuparnabhowmik10@xxxxxxxxx> Link: https://lore.kernel.org/r/20200822061528.7035-1-madhuparnabhowmik10@xxxxxxxxx Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/mmc/host/via-sdmmc.c b/drivers/mmc/host/via-sdmmc.c index 49dab9f42b6d6..9b755ea0fa03c 100644 --- a/drivers/mmc/host/via-sdmmc.c +++ b/drivers/mmc/host/via-sdmmc.c @@ -1257,11 +1257,14 @@ static void __maybe_unused via_init_sdc_pm(struct via_crdr_mmc_host *host) static int __maybe_unused via_sd_suspend(struct device *dev) { struct via_crdr_mmc_host *host; + unsigned long flags; host = dev_get_drvdata(dev); + spin_lock_irqsave(&host->lock, flags); via_save_pcictrlreg(host); via_save_sdcreg(host); + spin_unlock_irqrestore(&host->lock, flags); device_wakeup_enable(dev);