From: Tamseel Shams m.shams@samsung.com
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@samsung.com Tested-by: Marek Szyprowski m.szyprowski@samsung.com Reviewed-by: Krzysztof Kozlowski krzk@kernel.org Reviewed-by: Alim Akhtar alim.akhtar@samsung.com Signed-off-by: Tamseel Shams m.shams@samsung.com Cc: stable stable@vger.kernel.org Link: https://lore.kernel.org/r/20200810030021.45348-1-m.shams@samsung.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- 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 @@ -1719,9 +1719,11 @@ 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.