linux-kernel - [PATCH 1/2] staging: media: Clean up tests if NULL returned on failure

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Date:   Sat,  4 Mar 2017 00:25:18 +0530
From:   simran singhal <singhalsimran0@...il.com>
To:     Larry.Finger@...inger.net
Cc:     florian.c.schilhabel@...glemail.com, gregkh@...uxfoundation.org,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        outreachy-kernel@...glegroups.com
Subject: [PATCH 1/2] staging: media: Clean up tests if NULL returned on failure

Some functions like kmalloc/kzalloc return NULL on failure.
When NULL represents failure, !x is commonly used.

This was done using Coccinelle:
@@
expression *e;
identifier l1;
@@

e = \(kmalloc\|kzalloc\|kcalloc\|devm_kzalloc\)(...);
...
- e == NULL
+ !e

Signed-off-by: simran singhal <singhalsimran0@...il.com>
---
 drivers/staging/media/atomisp/pci/atomisp2/atomisp_fops.c | 2 +-
 drivers/staging/media/davinci_vpfe/vpfe_mc_capture.c      | 4 ++--
 drivers/staging/media/lirc/lirc_zilog.c                   | 6 +++---
 3 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/staging/media/atomisp/pci/atomisp2/atomisp_fops.c b/drivers/staging/media/atomisp/pci/atomisp2/atomisp_fops.c
index 20e581e..e5a7407 100644
--- a/drivers/staging/media/atomisp/pci/atomisp2/atomisp_fops.c
+++ b/drivers/staging/media/atomisp/pci/atomisp2/atomisp_fops.c
@@ -1100,7 +1100,7 @@ int atomisp_videobuf_mmap_mapper(struct videobuf_queue *q,
 			continue;
 
 		map = kzalloc(sizeof(struct videobuf_mapping), GFP_KERNEL);
-		if (map == NULL) {
+		if (!map) {
 			mutex_unlock(&q->vb_lock);
 			return -ENOMEM;
 		}
diff --git a/drivers/staging/media/davinci_vpfe/vpfe_mc_capture.c b/drivers/staging/media/davinci_vpfe/vpfe_mc_capture.c
index 32109cd..bffe215 100644
--- a/drivers/staging/media/davinci_vpfe/vpfe_mc_capture.c
+++ b/drivers/staging/media/davinci_vpfe/vpfe_mc_capture.c
@@ -228,7 +228,7 @@ static int vpfe_enable_clock(struct vpfe_device *vpfe_dev)
 
 	vpfe_dev->clks = kcalloc(vpfe_cfg->num_clocks,
 				 sizeof(*vpfe_dev->clks), GFP_KERNEL);
-	if (vpfe_dev->clks == NULL)
+	if (!vpfe_dev->clks)
 		return -ENOMEM;
 
 	for (i = 0; i < vpfe_cfg->num_clocks; i++) {
@@ -348,7 +348,7 @@ static int register_i2c_devices(struct vpfe_device *vpfe_dev)
 	vpfe_dev->sd =
 		  kcalloc(num_subdevs, sizeof(struct v4l2_subdev *),
 			  GFP_KERNEL);
-	if (vpfe_dev->sd == NULL)
+	if (!vpfe_dev->sd)
 		return -ENOMEM;
 
 	for (i = 0, k = 0; i < num_subdevs; i++) {
diff --git a/drivers/staging/media/lirc/lirc_zilog.c b/drivers/staging/media/lirc/lirc_zilog.c
index 34aac3e..4836182 100644
--- a/drivers/staging/media/lirc/lirc_zilog.c
+++ b/drivers/staging/media/lirc/lirc_zilog.c
@@ -1475,7 +1475,7 @@ static int ir_probe(struct i2c_client *client, const struct i2c_device_id *id)
 	ir = get_ir_device_by_adapter(adap);
 	if (ir == NULL) {
 		ir = kzalloc(sizeof(struct IR), GFP_KERNEL);
-		if (ir == NULL) {
+		if (!ir) {
 			ret = -ENOMEM;
 			goto out_no_ir;
 		}
@@ -1515,7 +1515,7 @@ static int ir_probe(struct i2c_client *client, const struct i2c_device_id *id)
 
 		/* Set up a struct IR_tx instance */
 		tx = kzalloc(sizeof(struct IR_tx), GFP_KERNEL);
-		if (tx == NULL) {
+		if (!tx) {
 			ret = -ENOMEM;
 			goto out_put_xx;
 		}
@@ -1559,7 +1559,7 @@ static int ir_probe(struct i2c_client *client, const struct i2c_device_id *id)
 
 		/* Set up a struct IR_rx instance */
 		rx = kzalloc(sizeof(struct IR_rx), GFP_KERNEL);
-		if (rx == NULL) {
+		if (!rx) {
 			ret = -ENOMEM;
 			goto out_put_xx;
 		}
-- 
2.7.4