[PATCH net v4 0/3] net: xilinx: axienet: Fix IRQ error handling

[PATCH net v4 0/3] net: xilinx: axienet: Fix IRQ error handling

[phucduc.bui]

From: bui duc phuc <phucduc.bui@gmail.com>

Hi all,

This series fixes IRQ error handling in the Xilinx AXI Ethernet driver

Handle errors from optional IRQ lookup and preserve the original error
codes instead of returning -ENOMEM.

The changes were found by manual code inspection and compile-tested
only.

Link v1 : 
https://lore.kernel.org/all/20260811034715.6034-1-phucduc.bui@gmail.com/
Link v2 : 
https://lore.kernel.org/all/20260813042012.17631-1-phucduc.bui@gmail.com/
Link v3 :
https://lore.kernel.org/all/20260817105241.63345-1-phucduc.bui@gmail.com/

Changes in v2 : 
 - Split one patch from v1 into two patches.
Changes in v3 :
 - Move the lp->eth_irq check below instead of handling it immediately 
   after platform_get_irq_optional()
 - Add error handling for platform_get_irq()
Changes in v4 : 
 - Add Reviewed-by tags
 - Add error handling for irq_of_parse_and_map()
 
Best regards,
Phuc

bui duc phuc (3):
  net: xilinx: axienet: Propagate errors from optional IRQ lookup
  net: xilinx: axienet: Handle optional IRQ return value correctly
  net: xilinx: axienet: Fix IRQ error handling

 drivers/net/ethernet/xilinx/xilinx_axienet_main.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

-- 
2.43.0

[PATCH net v4 1/3] net: xilinx: axienet: Propagate errors from optional IRQ lookup

[phucduc.bui]

From: bui duc phuc <phucduc.bui@gmail.com>

platform_get_irq_optional() returns a positive IRQ number on success or
a negative error code on failure. For an optional IRQ, -ENXIO indicates
that no optional IRQ is available, while other errors should be propagated.

Propagate all error codes returned by platform_get_irq_optional() other
than -ENXIO.

Another call to platform_get_irq_optional() in the same function already
handles the return value this way. Apply the same error handling to this
call site for consistency.

Fixes: d6349e3e14c7 ("net: axienet: Mark eth_irq as optional")
Reviewed-by: Radhey Shyam Pandey <radhey.shyam.pandey@amd.com>
Signed-off-by: bui duc phuc <phucduc.bui@gmail.com>
---
 drivers/net/ethernet/xilinx/xilinx_axienet_main.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
index 1722b7038f34..207aecb5f8b9 100644
--- a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
+++ b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
@@ -2975,6 +2975,8 @@ static int axienet_probe(struct platform_device *pdev)
 			dev_err(&pdev->dev, "could not determine irqs\n");
 			return -ENOMEM;
 		}
+		if (lp->eth_irq < 0 && lp->eth_irq != -ENXIO)
+			return lp->eth_irq;
 
 		/* Reset core now that clocks are enabled, prior to accessing MDIO */
 		ret = __axienet_device_reset(lp);
-- 
2.43.0

[PATCH net v4 2/3] net: xilinx: axienet: Handle optional IRQ return value correctly

[phucduc.bui]

From: bui duc phuc <phucduc.bui@gmail.com>

lp->eth_irq is assigned from platform_get_irq_optional(), which returns
a non-zero interrupt number on success or a negative error number on
failure. Errors other than -ENXIO are handled before this check,
so -ENXIO is the only error value that can reach this point.

Check for a negative value instead of treating 0 as an undefined IRQ.

Fixes: 522856cefaf0 ("net: axienet: Add optional support for Ethernet core interrupt")
Reviewed-by: Radhey Shyam Pandey <radhey.shyam.pandey@amd.com>
Signed-off-by: bui duc phuc <phucduc.bui@gmail.com>
---
 drivers/net/ethernet/xilinx/xilinx_axienet_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
index 207aecb5f8b9..3927ababf833 100644
--- a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
+++ b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
@@ -3052,7 +3052,7 @@ static int axienet_probe(struct platform_device *pdev)
 		ndev->ethtool_ops = &axienet_ethtool_ops;
 	}
 	/* Check for Ethernet core IRQ (optional) */
-	if (lp->eth_irq <= 0)
+	if (lp->eth_irq < 0)
 		dev_info(&pdev->dev, "Ethernet core IRQ not defined\n");
 
 	/* Retrieve the MAC address */
-- 
2.43.0

[PATCH net v4 3/3] net: xilinx: axienet: Fix IRQ error handling

[phucduc.bui]

From: bui duc phuc <phucduc.bui@gmail.com>

irq_of_parse_and_map() returns 0 when parsing or mapping an IRQ fails,
while platform_get_irq() returns a negative error code on failure.
Handle both cases and preserve the original IRQ lookup errors instead
of returning -ENOMEM.

Fixes: 28ef9ebdb64c ("net: axienet: make use of axistream-connected attribute optional")
Signed-off-by: bui duc phuc <phucduc.bui@gmail.com>
---

Changes in v4 : 
 - Add error handling for irq_of_parse_and_map()

 drivers/net/ethernet/xilinx/xilinx_axienet_main.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
index 3927ababf833..68b580191508 100644
--- a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
+++ b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
@@ -2971,10 +2971,14 @@ static int axienet_probe(struct platform_device *pdev)
 			dev_err(&pdev->dev, "could not map DMA regs\n");
 			return PTR_ERR(lp->dma_regs);
 		}
-		if (lp->rx_irq <= 0 || lp->tx_irq <= 0) {
+		if (!lp->rx_irq || !lp->tx_irq) {
 			dev_err(&pdev->dev, "could not determine irqs\n");
 			return -ENOMEM;
 		}
+		if (lp->rx_irq < 0)
+			return lp->rx_irq;
+		if (lp->tx_irq < 0)
+			return lp->tx_irq;
 		if (lp->eth_irq < 0 && lp->eth_irq != -ENXIO)
 			return lp->eth_irq;
 
-- 
2.43.0