The rx_chn->irq[] array is unsigned int but it should be signed for the
error handling to work.  Also if k3_udma_glue_rx_get_irq() returns zero
then we should return -ENXIO instead of success.

Fixes: 128d5874c082 ("net: ti: icssg-prueth: Add ICSSG ethernet driver")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
---
I had previously fixed the issues with the tx_chns() version of this but
I didn't realize there was an rx version.  These functions got moved
around in net-next so that's why I noticed this bug...  Moving the
code around makes applying this to net-next kind of pain.

 drivers/net/ethernet/ti/icssg/icssg_prueth.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/ti/icssg/icssg_prueth.c b/drivers/net/ethernet/ti/icssg/icssg_prueth.c
index cf7b73f8f450..b69af69a1ccd 100644
--- a/drivers/net/ethernet/ti/icssg/icssg_prueth.c
+++ b/drivers/net/ethernet/ti/icssg/icssg_prueth.c
@@ -421,12 +421,14 @@ static int prueth_init_rx_chns(struct prueth_emac *emac,
 		if (!i)
 			fdqring_id = k3_udma_glue_rx_flow_get_fdq_id(rx_chn->rx_chn,
 								     i);
-		rx_chn->irq[i] = k3_udma_glue_rx_get_irq(rx_chn->rx_chn, i);
-		if (rx_chn->irq[i] <= 0) {
-			ret = rx_chn->irq[i];
+		ret = k3_udma_glue_rx_get_irq(rx_chn->rx_chn, i);
+		if (ret <= 0) {
+			if (!ret)
+				ret = -ENXIO;
 			netdev_err(ndev, "Failed to get rx dma irq");
 			goto fail;
 		}
+		rx_chn->irq[i] = ret;
 	}
 
 	return 0;
-- 
2.43.0

On 23/04/24 9:45 pm, Dan Carpenter wrote:
> The rx_chn->irq[] array is unsigned int but it should be signed for the
> error handling to work.  Also if k3_udma_glue_rx_get_irq() returns zero
> then we should return -ENXIO instead of success.
> 
> Fixes: 128d5874c082 ("net: ti: icssg-prueth: Add ICSSG ethernet driver")
> Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>

Reviewed-by: MD Danish Anwar <danishanwar@ti.com>

-- 
Thanks and Regards,
Danish

On 23/04/2024 19:15, Dan Carpenter wrote:
> The rx_chn->irq[] array is unsigned int but it should be signed for the
> error handling to work.  Also if k3_udma_glue_rx_get_irq() returns zero
> then we should return -ENXIO instead of success.
> 
> Fixes: 128d5874c082 ("net: ti: icssg-prueth: Add ICSSG ethernet driver")
> Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>

Reviewed-by: Roger Quadros <rogerq@kernel.org>