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idma64: Don't try to serve interrupts when device is powered off 

[ Upstream commit 9140ce4787 ]

When iDMA 64-bit device is powered off, the IRQ status register
is all 1:s. This is never happen in real case and signalling that
the device is simply powered off. Don't try to serve interrupts
that are not ours.

Fixes: 667dfed986 ("dmaengine: add a driver for Intel integrated DMA 64-bit")
Reported-by: Heiner Kallweit <hkallweit1@gmail.com>
Closes: https://lore.kernel.org/r/700bbb84-90e1-4505-8ff0-3f17ea8bc631@gmail.com
Tested-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20240321120453.1360138-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Andy Shevchenko 2024-03-21 14:04:21 +02:00 committed by Greg Kroah-Hartman
parent 6e98921f6f
commit 4b80c0260b
1 changed files with 4 additions and 0 deletions
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4
drivers/dma/idma64.c
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@ -171,6 +171,10 @@ static irqreturn_t idma64_irq(int irq, void *dev)
u32 status_err;
unsigned short i;
/* Since IRQ may be shared, check if DMA controller is powered on */
if (status == GENMASK(31, 0))
return IRQ_NONE;
dev_vdbg(idma64->dma.dev, "%s: status=%#x\n", __func__, status);
/* Check if we have any interrupt from the DMA controller */