From ce8ab5f168f654101ecba3f4443b12d4afdee841 Mon Sep 17 00:00:00 2001 From: Krzysztof Kozlowski Date: Sat, 25 Feb 2017 18:36:44 +0200 Subject: [PATCH] serial: samsung: Continue to work if DMA request fails MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit commit f98c7bce570bdbe344b74ff5daa7dfeef3f22929 upstream. If DMA is not available (even when configured in DeviceTree), the driver will fail the startup procedure thus making serial console not available. For example this causes boot failure on QEMU ARMv7 (Exynos4210, SMDKC210): [    1.302575] OF: amba_device_add() failed (-19) for /amba/pdma@12680000 ... [   11.435732] samsung-uart 13800000.serial: DMA request failed [   72.963893] samsung-uart 13800000.serial: DMA request failed [   73.143361] Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000000 DMA is not necessary for serial to work, so continue with UART startup after emitting a warning. Fixes: 62c37eedb74c ("serial: samsung: add dma reqest/release functions") Signed-off-by: Krzysztof Kozlowski Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/samsung.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c index f44615fa474d..3e2ef4fd7382 100644 --- a/drivers/tty/serial/samsung.c +++ b/drivers/tty/serial/samsung.c @@ -1036,8 +1036,10 @@ static int s3c64xx_serial_startup(struct uart_port *port) if (ourport->dma) { ret = s3c24xx_serial_request_dma(ourport); if (ret < 0) { - dev_warn(port->dev, "DMA request failed\n"); - return ret; + dev_warn(port->dev, + "DMA request failed, DMA will not be used\n"); + devm_kfree(port->dev, ourport->dma); + ourport->dma = NULL; } } -- 2.17.1