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authorGuennadi Liakhovetski <g.liakhovetski@gmx.de>2012-09-18 06:42:42 +0000
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-10-13 05:47:24 +0900
commit8c6924929b212796dcab375c9ac482baef142205 (patch)
treebeb4263ad48b871027acb3860332a6c2d308ee68
parent43607369d9051678701f6f9dedfac2fbc85bc601 (diff)
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 <koba@kmckk.co.jp> Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Chris Ball <cjb@laptop.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/mmc/host/sh_mmcif.c4
1 files changed, 4 insertions, 0 deletions
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;