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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>
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@ -317,6 +317,7 @@ static void sdhci_config_dma(struct sdhci_host *host)
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static void sdhci_init(struct sdhci_host *host, int soft)
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{
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struct mmc_host *mmc = host->mmc;
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unsigned long flags;
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if (soft)
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sdhci_do_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA);
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@ -326,7 +327,9 @@ static void sdhci_init(struct sdhci_host *host, int soft)
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if (host->v4_mode)
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sdhci_do_enable_v4_mode(host);
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spin_lock_irqsave(&host->lock, flags);
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sdhci_set_default_irqs(host);
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spin_unlock_irqrestore(&host->lock, flags);
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host->cqe_on = false;
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