mmc: sdhci: Ignore unexpected CARD_INT interrupts

commit 161e6d44a5e2d3f85365cb717d60e363171b39e6 upstream.

One of our kernelCI boxes hanged at boot because a faulty eSDHC device
was triggering spurious CARD_INT interrupts for SD cards, causing CMD52
reads, which are not allowed for SD devices.  This adds a sanity check
to the interruption path, preventing that illegal command from getting
sent if the CARD_INT interruption should be disabled.

This quirk allows that particular machine to resume boot despite the
faulty hardware, instead of getting hung dealing with thousands of
mishandled interrupts.

Suggested-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.co.uk>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index e1e274a0a34f..ba637ff8aa7e 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -2719,7 +2719,8 @@ static irqreturn_t sdhci_irq(int irq, void *dev_id)
                 if (intmask & SDHCI_INT_RETUNE)
                         mmc_retune_needed(host->mmc);
 
-                if (intmask & SDHCI_INT_CARD_INT) {
+                if ((intmask & SDHCI_INT_CARD_INT) &&
+                    (host->ier & SDHCI_INT_CARD_INT)) {
                         sdhci_enable_sdio_irq_nolock(host, false);
                         host->thread_isr |= SDHCI_INT_CARD_INT;
                         result = IRQ_WAKE_THREAD;