From: Jiasheng Jiang jiasheng@iscas.ac.cn
[ Upstream commit c6564c13dae25cd7f8e1de5127b4da4500ee5844 ]
For the possible failure of the platform_get_irq(), the returned irq could be error number and will finally cause the failure of the request_irq().
Consider that platform_get_irq() can now in certain cases return -EPROBE_DEFER, and the consequences of letting request_irq() effectively convert that into -EINVAL, even at probe time rather than later on. So it might be better to check just now.
Fixes: b1201e44f50b ("can: xilinx CAN controller support") Link: https://lore.kernel.org/all/20211224021324.1447494-1-jiasheng@iscas.ac.cn Signed-off-by: Jiasheng Jiang jiasheng@iscas.ac.cn Signed-off-by: Marc Kleine-Budde mkl@pengutronix.de Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/can/xilinx_can.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/net/can/xilinx_can.c b/drivers/net/can/xilinx_can.c index 0de39ebb35662..008d3d492bd1c 100644 --- a/drivers/net/can/xilinx_can.c +++ b/drivers/net/can/xilinx_can.c @@ -1753,7 +1753,12 @@ static int xcan_probe(struct platform_device *pdev) spin_lock_init(&priv->tx_lock);
/* Get IRQ for the device */ - ndev->irq = platform_get_irq(pdev, 0); + ret = platform_get_irq(pdev, 0); + if (ret < 0) + goto err_free; + + ndev->irq = ret; + ndev->flags |= IFF_ECHO; /* We support local echo */
platform_set_drvdata(pdev, ndev);