mmc: via-sdmmc: Fix data race bug
[ Upstream commit 87d7ad089b
]
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@gmail.com>
Link: https://lore.kernel.org/r/20200822061528.7035-1-madhuparnabhowmik10@gmail.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
5.4-rM2-2.2.x-imx-squashed
parent
67e18c92e0
commit
d3fb88a51c
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@ -1259,11 +1259,14 @@ static void via_init_sdc_pm(struct via_crdr_mmc_host *host)
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static int via_sd_suspend(struct pci_dev *pcidev, pm_message_t state)
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{
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struct via_crdr_mmc_host *host;
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unsigned long flags;
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host = pci_get_drvdata(pcidev);
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spin_lock_irqsave(&host->lock, flags);
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via_save_pcictrlreg(host);
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via_save_sdcreg(host);
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spin_unlock_irqrestore(&host->lock, flags);
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pci_save_state(pcidev);
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pci_enable_wake(pcidev, pci_choose_state(pcidev, state), 0);
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