From: Tamseel Shams <m.shams@xxxxxxxxxxx> commit 8c6c378b0cbe0c9f1390986b5f8ffb5f6ff7593b upstream. In few older Samsung SoCs like s3c2410, s3c2412 and s3c2440, UART IP is having 2 interrupt lines. However, in other SoCs like s3c6400, s5pv210, exynos5433, and exynos4210 UART is having only 1 interrupt line. Due to this, "platform_get_irq(platdev, 1)" call in the driver gives the following false-positive error: "IRQ index 1 not found" on newer SoC's. This patch adds the condition to check for Tx interrupt only for the those SoC's which have 2 interrupt lines. Tested-by: Alim Akhtar <alim.akhtar@xxxxxxxxxxx> Tested-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx> Reviewed-by: Krzysztof Kozlowski <krzk@xxxxxxxxxx> Reviewed-by: Alim Akhtar <alim.akhtar@xxxxxxxxxxx> Signed-off-by: Tamseel Shams <m.shams@xxxxxxxxxxx> Cc: stable <stable@xxxxxxxxxxxxxxx> Link: https://lore.kernel.org/r/20200810030021.45348-1-m.shams@xxxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/tty/serial/samsung.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) --- a/drivers/tty/serial/samsung.c +++ b/drivers/tty/serial/samsung.c @@ -1755,9 +1755,11 @@ static int s3c24xx_serial_init_port(stru ourport->tx_irq = ret + 1; } - ret = platform_get_irq(platdev, 1); - if (ret > 0) - ourport->tx_irq = ret; + if (!s3c24xx_serial_has_interrupt_mask(port)) { + ret = platform_get_irq(platdev, 1); + if (ret > 0) + ourport->tx_irq = ret; + } /* * DMA is currently supported only on DT platforms, if DMA properties * are specified.
