From 8ba92a5da35997ba9f70cf58e6dd1326f7f6ef2a Mon Sep 17 00:00:00 2001 From: Guennadi Liakhovetski Date: Tue, 18 Sep 2012 06:42:42 +0000 Subject: [PATCH] mmc: sh-mmcif: avoid oops on spurious interrupts On some systems, e.g., kzm9g, MMCIF interfaces can produce spurious interrupts without any active request. To prevent the Oops, that results in such cases, don't dereference the mmc request pointer until we make sure, that we are indeed processing such a request. Reported-by: Tetsuyuki Kobayashi Signed-off-by: Guennadi Liakhovetski Cc: stable Signed-off-by: Chris Ball --- drivers/mmc/host/sh_mmcif.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/mmc/host/sh_mmcif.c b/drivers/mmc/host/sh_mmcif.c index 6df3dc3164f73..11d2bc3b51d57 100644 --- a/drivers/mmc/host/sh_mmcif.c +++ b/drivers/mmc/host/sh_mmcif.c @@ -1231,6 +1231,10 @@ static irqreturn_t sh_mmcif_intr(int irq, void *dev_id) host->sd_error = true; dev_dbg(&host->pd->dev, "int err state = %08x\n", state); } + if (host->state == STATE_IDLE) { + dev_info(&host->pd->dev, "Spurious IRQ status 0x%x", state); + return IRQ_HANDLED; + } if (state & ~(INT_CMD12RBE | INT_CMD12CRE)) { if (!host->dma_active) return IRQ_WAKE_THREAD; -- 2.39.5