serial: samsung: Removes the IRQ not found warning

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 <[email protected]>
Tested-by: Marek Szyprowski <[email protected]>
Reviewed-by: Krzysztof Kozlowski <[email protected]>
Reviewed-by: Alim Akhtar <[email protected]>
Signed-off-by: Tamseel Shams <[email protected]>
Cc: stable <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

diff --git a/drivers/tty/serial/samsung_tty.c b/drivers/tty/serial/samsung_tty.c
index 8ed3482d2e1ebd44616e7e3dc060c6fd3734b7bc..8ae3e03fbd8ce625742782950af00eebbf698c64 100644 (file)
--- a/drivers/tty/serial/samsung_tty.c
+++ b/drivers/tty/serial/samsung_tty.c
@@ -1905,9 +1905,11 @@ static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport,
                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.