On 2021-12-23 12:14, Jiasheng Jiang wrote:
Because of the possible failure of the platform_get_irq(), it should be better to check it to avoid the use of error irq.
As far as I can see, the only "use" of error values is that they will be passed to request_irq(), which will then return -EINVAL because they are not valid IRQ numbers, and that error will be handled appropriately. I think that's a relatively common pattern, so your commit message should really describe why you think it's a problem and why this addition is a meaningful improvement.
Robin.
Fixes: 041f031def33 ("serial: mps2-uart: add MPS2 UART driver") Signed-off-by: Jiasheng Jiang <jiasheng@xxxxxxxxxxx> --- Changelog: v2 -> v3 *Change 1. Using error variable to check. *Change 2. Add new commit message. --- drivers/tty/serial/mps2-uart.c | 26 ++++++++++++++++++++++---- 1 file changed, 22 insertions(+), 4 deletions(-) diff --git a/drivers/tty/serial/mps2-uart.c b/drivers/tty/serial/mps2-uart.c index 587b42f754cb..24a52300d8d9 100644 --- a/drivers/tty/serial/mps2-uart.c +++ b/drivers/tty/serial/mps2-uart.c @@ -584,11 +584,29 @@ static int mps2_init_port(struct platform_device *pdev,if (mps_port->flags & UART_PORT_COMBINED_IRQ) {- mps_port->port.irq = platform_get_irq(pdev, 0); + ret = platform_get_irq(pdev, 0); + if (ret < 0) + return ret; + + mps_port->port.irq = ret; } else { - mps_port->rx_irq = platform_get_irq(pdev, 0); - mps_port->tx_irq = platform_get_irq(pdev, 1); - mps_port->port.irq = platform_get_irq(pdev, 2); + ret = platform_get_irq(pdev, 0); + if (ret < 0) + return ret; + + mps_port->rx_irq = ret; + + ret = platform_get_irq(pdev, 1); + if (ret < 0) + return ret; + + mps_port->tx_irq = ret; + + ret = platform_get_irq(pdev, 2); + if (ret < 0) + return ret; + + mps_port->port.irq = ret; }return ret;
