While performing suspend/resume, we were getting below kernel crash.
[ 54.541672] [FTS][Info]gesture suspend...
[ 54.605256] [FTS][Error][GESTURE]Enter into gesture(suspend) failed!
[ 54.605256]
[ 58.345850] irq event 10: bogus return value fff3
..
[ 58.345966] [] el1_irq+0xb0/0x124
[ 58.345971] [] arch_cpu_idle+0x10/0x18
[ 58.345975] [] do_idle+0x1ac/0x1e0
[ 58.345979] [] cpu_startup_entry+0x20/0x28
[ 58.345983] [] rest_init+0xd0/0xdc
[ 58.345988] [] start_kernel+0x390/0x3a4
[ 58.345990] handlers:
[ 58.345994] [] bam_dma_irq
The reason for the crash we found is, bam_dma_irq() was returning
negative value when the device resumes in some conditions.
In addition, the irq handler should have one of the below return values.
IRQ_NONEinterrupt was not from this device or was not handled
IRQ_HANDLED interrupt was handled by this device
IRQ_WAKE_THREAD handler requests to wake the handler thread
Therefore, to resolve this crash, we have changed the return value to
IRQ_NONE.
Signed-off-by: Parth Y Shah
---
drivers/dma/qcom/bam_dma.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/dma/qcom/bam_dma.c b/drivers/dma/qcom/bam_dma.c
index 4eeb8bb..d5773d4 100644
--- a/drivers/dma/qcom/bam_dma.c
+++ b/drivers/dma/qcom/bam_dma.c
@@ -875,7 +875,7 @@ static irqreturn_t bam_dma_irq(int irq, void *data)
ret = bam_pm_runtime_get_sync(bdev->dev);
if (ret < 0)
- return ret;
+ return IRQ_NONE;
if (srcs & BAM_IRQ) {
clr_mask = readl_relaxed(bam_addr(bdev, 0, BAM_IRQ_STTS));
--
2.7.4
