summaryrefslogtreecommitdiffstats
path: root/drivers/tty/serial/fsl_lpuart.c
diff options
context:
space:
mode:
authorMichael Walle <michael@walle.cc>2020-04-03 19:49:42 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2020-04-16 16:12:34 +0200
commit810bc0a5fafb8575b9406fcc8b0be77ff93a7be0 (patch)
treec9e604703b4f973dc039d6f7a282800d173375b3 /drivers/tty/serial/fsl_lpuart.c
parentserial: omap: Convert to use GPIO descriptors (diff)
downloadlinux-810bc0a5fafb8575b9406fcc8b0be77ff93a7be0.tar.xz
linux-810bc0a5fafb8575b9406fcc8b0be77ff93a7be0.zip
tty: serial: fsl_lpuart: make coverity happy
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>
Diffstat (limited to 'drivers/tty/serial/fsl_lpuart.c')
-rw-r--r--drivers/tty/serial/fsl_lpuart.c4
1 files changed, 1 insertions, 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;