From: Gabriel Krisman Bertazi Date: Mon, 16 Jan 2017 14:23:42 +0000 (-0200) Subject: mmc: sdhci: Ignore unexpected CARD_INT interrupts X-Git-Tag: firefly_0821_release~176^2~4^2^2~11 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=3a8e217851c9854b3f122ed1651d68a05884c730;p=firefly-linux-kernel-4.4.55.git 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 Signed-off-by: Gabriel Krisman Bertazi Acked-by: Adrian Hunter Signed-off-by: Ulf Hansson Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index 7277dfd7338f..bda164089904 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -2629,7 +2629,8 @@ static irqreturn_t sdhci_irq(int irq, void *dev_id) pr_err("%s: Card is consuming too much power!\n", mmc_hostname(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;