From: Wei Yongjun <weiyongjun1@huawei.com>
Date: Thu, 8 Sep 2016 15:03:24 +0000 (+0000)
Subject: tty: serial: fsl_lpuart: use GFP_ATOMIC under spin lock
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=33ddca08bf9d68086e3e9ad6bef06ce881777894;p=linux-beck.git

tty: serial: fsl_lpuart: use GFP_ATOMIC under spin lock

The function lpuart_start_rx_dma() is called from several
places, in some of which, such as lpuart_startup(), a lock
be held here, so we should use GFP_ATOMIC when a lock is held.

Fixes: 5887ad43ee02 ("tty: serial: fsl_lpuart: Use cyclic DMA for Rx")
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index b21f3e541714..de9d5107c00a 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -852,7 +852,7 @@ static inline int lpuart_start_rx_dma(struct lpuart_port *sport)
 	if (sport->rx_dma_rng_buf_len < 16)
 		sport->rx_dma_rng_buf_len = 16;
 
-	ring->buf = kmalloc(sport->rx_dma_rng_buf_len, GFP_KERNEL);
+	ring->buf = kmalloc(sport->rx_dma_rng_buf_len, GFP_ATOMIC);
 	if (!ring->buf) {
 		dev_err(sport->port.dev, "Ring buf alloc failed\n");
 		return -ENOMEM;