[PATCH 3/3] rapidio: tsi721_dma: Adjust six checks for null pointers

From: SF Markus Elfring
Date: Fri Dec 15 2017 - 11:38:21 EST


From: Markus Elfring <elfring@xxxxxxxxxxxxxxxxxxxxx>
Date: Fri, 15 Dec 2017 14:35:21 +0100
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The script âcheckpatch.plâ pointed information out like the following.

Comparison to NULL could be written !â

Thus fix the affected source code places.

Signed-off-by: Markus Elfring <elfring@xxxxxxxxxxxxxxxxxxxxx>
---
drivers/rapidio/devices/tsi721_dma.c | 12 +++++-------
1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/drivers/rapidio/devices/tsi721_dma.c b/drivers/rapidio/devices/tsi721_dma.c
index 14fc36ac3d85..006ea5a45020 100644
--- a/drivers/rapidio/devices/tsi721_dma.c
+++ b/drivers/rapidio/devices/tsi721_dma.c
@@ -222,7 +222,7 @@ static int tsi721_bdma_ch_free(struct tsi721_bdma_chan *bdma_chan)
struct tsi721_device *priv = to_tsi721(bdma_chan->dchan.device);
#endif

- if (bdma_chan->bd_base == NULL)
+ if (!bdma_chan->bd_base)
return 0;

/* Check if DMA channel still running */
@@ -346,7 +346,7 @@ tsi721_desc_fill_init(struct tsi721_tx_desc *desc,
{
u64 rio_addr;

- if (bd_ptr == NULL)
+ if (!bd_ptr)
return -EINVAL;

/* Initialize DMA descriptor */
@@ -370,7 +370,7 @@ tsi721_desc_fill_init(struct tsi721_tx_desc *desc,
static int
tsi721_desc_fill_end(struct tsi721_dma_desc *bd_ptr, u32 bcount, bool interrupt)
{
- if (bd_ptr == NULL)
+ if (!bd_ptr)
return -EINVAL;

/* Update DMA descriptor */
@@ -555,9 +555,7 @@ static void tsi721_advance_work(struct tsi721_bdma_chan *bdma_chan,
* If there is no data transfer in progress, fetch new descriptor from
* the pending queue.
*/
-
- if (desc == NULL && bdma_chan->active_tx == NULL &&
- !list_empty(&bdma_chan->queue)) {
+ if (!desc && !bdma_chan->active_tx && !list_empty(&bdma_chan->queue)) {
desc = list_first_entry(&bdma_chan->queue,
struct tsi721_tx_desc, desc_node);
list_del_init((&desc->desc_node));
@@ -796,7 +794,7 @@ static void tsi721_free_chan_resources(struct dma_chan *dchan)

tsi_debug(DMA, &dchan->dev->device, "DMAC%d", bdma_chan->id);

- if (bdma_chan->bd_base == NULL)
+ if (!bdma_chan->bd_base)
return;

tsi721_bdma_interrupt_enable(bdma_chan, 0);
--
2.15.1