4.19-stable review patch. If anyone has any objections, please let me know.
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From: Andy Shevchenko andriy.shevchenko@linux.intel.com
[ 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: 667dfed98615 ("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.i... Signed-off-by: Vinod Koul vkoul@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/dma/idma64.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/drivers/dma/idma64.c b/drivers/dma/idma64.c index 89c5e5b460687..920e98dc7113e 100644 --- a/drivers/dma/idma64.c +++ b/drivers/dma/idma64.c @@ -172,6 +172,10 @@ 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 */