tree 5c8b730a137696ef979f05ceae869b6e0348794c
parent 566cf877a1fcb6d6dc0126b076aad062054c2637
author Gabriel Krisman Bertazi <krisman@collabora.co.uk> 1484576622 -0200
committer Ulf Hansson <ulf.hansson@linaro.org> 1485858409 +0100

mmc: sdhci: Ignore unexpected CARD_INT interrupts

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>
Cc: <stable@vger.kernel.org>