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

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[ Upstream commit 9140ce47872bfd89fca888c2f992faa51d20c2bc ]

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 <[email protected]>
Closes: https://lore.kernel.org/r/[email protected]
Tested-by: Heiner Kallweit <[email protected]>
Signed-off-by: Andy Shevchenko <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Vinod Koul <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
This commit is contained in:
Andy Shevchenko 2024-03-21 14:04:21 +02:00 • committed by Greg Kroah-Hartman
commit 65a241aac3
1 changed files with 4 additions and 0 deletions
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4
drivers/dma/idma64.c
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@ -167,6 +167,10 @@ 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 */