From 8c63c3bf3e32a13c22edff2a9cc7310a46092e70 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 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 5d8142773fac..ba0e493ad0c6 100644 --- a/drivers/mmc/host/sh_mmcif.c +++ b/drivers/mmc/host/sh_mmcif.c @@ -1229,6 +1229,10 @@ 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; -- 2.43.0