From 4c42d979816a0bc1d87aaabc4089d857942ddfe2 Mon Sep 17 00:00:00 2001 From: Somya Anand Date: Mon, 16 Mar 2015 19:34:11 +0530 Subject: [PATCH] Staging: nvec: use !x instead of x == NULL Functions like devm_kzalloc, kmalloc_array, devm_ioremap, usb_alloc_urb, alloc_netdev return NULL as a return value on failure. Generally, When NULL represents failure, !x is commonly used. This patch cleans up the tests on the results of these functions, thereby using !x instead of x == NULL or NULL == x. This is done via following coccinelle script: @prob_7@ identifier x; statement S; @@ ( x = devm_kzalloc(...); | x = usb_alloc_urb(...); | x = kmalloc_array(...); | x = devm_ioremap(...); | x = alloc_netdev(...); ) ... - if(NULL == x) + if(!x) S Further we have used isomorphism characteristics of coccinelle to indicate x == NULL and NULL == x are equivalent. This is done via following iso script. Expression @ is_null @ expression X; @@ X == NULL <=> NULL == X Signed-off-by: Somya Anand Signed-off-by: Greg Kroah-Hartman --- drivers/staging/nvec/nvec.c | 2 +- drivers/staging/nvec/nvec_paz00.c | 2 +- drivers/staging/nvec/nvec_power.c | 2 +- drivers/staging/nvec/nvec_ps2.c | 2 +- 4 files changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/staging/nvec/nvec.c b/drivers/staging/nvec/nvec.c index 5868ebb8389e..1bdc8d001e65 100644 --- a/drivers/staging/nvec/nvec.c +++ b/drivers/staging/nvec/nvec.c @@ -803,7 +803,7 @@ static int tegra_nvec_probe(struct platform_device *pdev) } nvec = devm_kzalloc(&pdev->dev, sizeof(struct nvec_chip), GFP_KERNEL); - if (nvec == NULL) + if (!nvec) return -ENOMEM; platform_set_drvdata(pdev, nvec); diff --git a/drivers/staging/nvec/nvec_paz00.c b/drivers/staging/nvec/nvec_paz00.c index f0cea0e43c96..68146bfee2b3 100644 --- a/drivers/staging/nvec/nvec_paz00.c +++ b/drivers/staging/nvec/nvec_paz00.c @@ -51,7 +51,7 @@ static int nvec_paz00_probe(struct platform_device *pdev) int ret = 0; led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL); - if (led == NULL) + if (!led) return -ENOMEM; led->cdev.max_brightness = NVEC_LED_MAX; diff --git a/drivers/staging/nvec/nvec_power.c b/drivers/staging/nvec/nvec_power.c index 6a1459d4f8fb..3621b661aba8 100644 --- a/drivers/staging/nvec/nvec_power.c +++ b/drivers/staging/nvec/nvec_power.c @@ -378,7 +378,7 @@ static int nvec_power_probe(struct platform_device *pdev) struct nvec_chip *nvec = dev_get_drvdata(pdev->dev.parent); power = devm_kzalloc(&pdev->dev, sizeof(struct nvec_power), GFP_NOWAIT); - if (power == NULL) + if (!power) return -ENOMEM; dev_set_drvdata(&pdev->dev, power); diff --git a/drivers/staging/nvec/nvec_ps2.c b/drivers/staging/nvec/nvec_ps2.c index 4fd63c239454..6ebbc82323c3 100644 --- a/drivers/staging/nvec/nvec_ps2.c +++ b/drivers/staging/nvec/nvec_ps2.c @@ -109,7 +109,7 @@ static int nvec_mouse_probe(struct platform_device *pdev) char mouse_reset[] = { NVEC_PS2, SEND_COMMAND, PSMOUSE_RST, 3 }; ser_dev = devm_kzalloc(&pdev->dev, sizeof(struct serio), GFP_KERNEL); - if (ser_dev == NULL) + if (!ser_dev) return -ENOMEM; ser_dev->id.type = SERIO_PS_PSTHRU; -- 2.30.2