From 8c6924929b212796dcab375c9ac482baef142205 Mon Sep 17 00:00:00 2001 From: Guennadi Liakhovetski Date: Tue, 18 Sep 2012 06:42:42 +0000 Subject: mmc: sh-mmcif: avoid oops on spurious interrupts commit 8464dd52d3198dd05cafb005371d76e5339eb842 upstream. 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 Signed-off-by: Chris Ball Signed-off-by: Greg Kroah-Hartman --- 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 724b35e85a26..3b8236bedee5 100644 --- a/drivers/mmc/host/sh_mmcif.c +++ b/drivers/mmc/host/sh_mmcif.c @@ -1191,6 +1191,10 @@ 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; -- cgit v1.2.3