From: Haibo Chen <haibo.chen@xxxxxxx>
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@xxxxxxx>
---
drivers/mmc/host/sdhci.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 3f716466fcfd..79b6324a500c 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -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;
--
2.17.1
