From: Michael Walle <michael@walle.cc>
Date: Fri, 3 Apr 2020 19:49:42 +0200
Subject: tty: serial: fsl_lpuart: make coverity happy
Git-commit: 810bc0a5fafb8575b9406fcc8b0be77ff93a7be0
Patch-mainline: v5.8-rc1
References: jsc#SLE-12251
Coverity reports the following:
var_compare_op: Comparing chan to null implies that chan might be null.
1234 if (chan)
1235 dmaengine_terminate_all(chan);
1236
Dereference after null check (FORWARD_NULL)
var_deref_op: Dereferencing null pointer chan.
1237 dma_unmap_sg(chan->device->dev, &sport->rx_sgl, 1, DMA_FROM_DEVICE);
Technically, this is correct. But lpuart_dma_rx_free() is guarded by
lpuart_dma_rx_use which is only true if there is a dma channel, see
lpuart_rx_dma_startup(). In any way, this looks bogus. So remove
the superfluous "if (chan)" check and make coverity happy.
Fixes: a092ab25fdaa ("tty: serial: fsl_lpuart: fix DMA mapping")
Signed-off-by: Michael Walle <michael@walle.cc>
Reported-by: Colin Ian King <colin.king@canonical.com>
Acked-by: Jiri Slaby <jslaby@suse.cz>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
Link: https://lore.kernel.org/r/20200403174942.9594-1-michael@walle.cc
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Mian Yousaf Kaukab <yousaf.kaukab@suse.com>
---
drivers/tty/serial/fsl_lpuart.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index 5d41075964f2..dba730d1801f 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -1231,9 +1231,7 @@ static void lpuart_dma_rx_free(struct uart_port *port)
struct lpuart_port, port);
struct dma_chan *chan = sport->dma_rx_chan;
- if (chan)
- dmaengine_terminate_all(chan);
-
+ dmaengine_terminate_all(chan);
dma_unmap_sg(chan->device->dev, &sport->rx_sgl, 1, DMA_FROM_DEVICE);
kfree(sport->rx_ring.buf);
sport->rx_ring.tail = 0;
--
2.26.2