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mmc: sdhci: add spin lock for sdhci_set_default_irqs in sdhci_init 

When use one SDIO wifi which enable the runtime PM feature on i.MX6SX,
we meet system hang. This hang happened during the usdhc runtime resume,
in sdhci_init(), when call the sdhci_set_default_irqs. One interrupt
(SDHCI_INT_CARD_INT) triggered just after the host->ier update and before
the write of register SDHCI_SIGNAL_ENABLE. So in sdhci_irq, it will skip
the call of sdio_signal_irq() because current host->ier do not set the
SDHCI_INT_CARD_INT. So this SDIO wifi interrupt always keep triggered,
let the system stuck in irq handle, can't response any other thread.

This patch add spin lock for the sdhci_set_default_irqs to fix this issue.

Signed-off-by: Haibo Chen <haibo.chen@nxp.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Link: https://lore.kernel.org/r/1586941255-9237-1-git-send-email-haibo.chen@nxp.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Haibo Chen 2020-04-15 17:00:55 +08:00 committed by Ulf Hansson
parent 61ab64e2f5
commit 49769d4d35
1 changed files with 3 additions and 0 deletions
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3
drivers/mmc/host/sdhci.c
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@ -317,6 +317,7 @@ static void sdhci_config_dma(struct sdhci_host *host)
static void sdhci_init(struct sdhci_host *host, int soft)
{
struct mmc_host *mmc = host->mmc;
unsigned long flags;
if (soft)
sdhci_do_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA);
@ -326,7 +327,9 @@ static void sdhci_init(struct sdhci_host *host, int soft)
if (host->v4_mode)
sdhci_do_enable_v4_mode(host);
spin_lock_irqsave(&host->lock, flags);
sdhci_set_default_irqs(host);
spin_unlock_irqrestore(&host->lock, flags);
host->cqe_on = false;