From: Miquel Raynal <miquel.raynal@xxxxxxxxxxx>
commit 96891e90d1256b569b1c183e7c9a0cfc568fa3b0 upstream.
A couple of hardware registers need to be set to reflect which
interrupts have been allocated to the device. Each register is 32-bit
wide and can receive four 8-bit values. If we provide any other interrupt
number than four, the irq_num variable will never be 0 within the while
check and the while block will loop forever.
There is an easy way to prevent this: just break the for loop
when we reach "irq_num == 0", which anyway means all interrupts have
been processed.
Cc: stable@xxxxxxxxxxxxxxx
Fixes: 17ce252266c7 ("dmaengine: xilinx: xdma: Add xilinx xdma driver")
Signed-off-by: Miquel Raynal <miquel.raynal@xxxxxxxxxxx>
Acked-by: Lizhi Hou <lizhi.hou@xxxxxxx>
Link: https://lore.kernel.org/r/20230731101442.792514-2-miquel.raynal@xxxxxxxxxxx
Signed-off-by: Vinod Koul <vkoul@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/dma/xilinx/xdma.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/dma/xilinx/xdma.c b/drivers/dma/xilinx/xdma.c
index ad5ff63354cf..5116188b9977 100644
--- a/drivers/dma/xilinx/xdma.c
+++ b/drivers/dma/xilinx/xdma.c
@@ -668,6 +668,8 @@ static int xdma_set_vector_reg(struct xdma_device *xdev, u32 vec_tbl_start,
val |= irq_start << shift;
irq_start++;
irq_num--;
+ if (!irq_num)
+ break;
}
/* write IRQ register */
--
2.41.0
