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mmc: sh-mmcif: avoid oops on spurious interrupts

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commit 8464dd52d3 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>
This commit is contained in:
Guennadi Liakhovetski 2012-09-18 06:42:42 +00:00 committed by Greg Kroah-Hartman
parent 3883e28264
commit 719740d5de
1 changed files with 4 additions and 0 deletions
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4
drivers/mmc/host/sh_mmcif.c
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@ -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;