[PATCH 04/14] vme: Adjust 48 checks for null pointers

From: SF Markus Elfring
Date: Fri Aug 25 2017 - 11:59:16 EST

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From: Markus Elfring <elfring@xxxxxxxxxxxxxxxxxxxxx>
Date: Thu, 24 Aug 2017 22:24:38 +0200
MIME-Version: 1.0
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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/vme/vme.c | 101 ++++++++++++++++++++++++++----------------------------
1 file changed, 48 insertions(+), 53 deletions(-)

diff --git a/drivers/vme/vme.c b/drivers/vme/vme.c
index d890410e472d..a2e36e6a0d84 100644
--- a/drivers/vme/vme.c
+++ b/drivers/vme/vme.c
@@ -92,23 +92,23 @@ void *vme_alloc_consistent(struct vme_resource *resource, size_t size,
{
struct vme_bridge *bridge;

- if (resource == NULL) {
+ if (!resource) {
printk(KERN_ERR "No resource\n");
return NULL;
}

bridge = find_bridge(resource);
- if (bridge == NULL) {
+ if (!bridge) {
printk(KERN_ERR "Can't find bridge\n");
return NULL;
}

- if (bridge->parent == NULL) {
+ if (!bridge->parent) {
printk(KERN_ERR "Dev entry NULL for bridge %s\n", bridge->name);
return NULL;
}

- if (bridge->alloc_consistent == NULL) {
+ if (!bridge->alloc_consistent) {
printk(KERN_ERR "alloc_consistent not supported by bridge %s\n",
bridge->name);
return NULL;
@@ -132,23 +132,23 @@ void vme_free_consistent(struct vme_resource *resource, size_t size,
{
struct vme_bridge *bridge;

- if (resource == NULL) {
+ if (!resource) {
printk(KERN_ERR "No resource\n");
return;
}

bridge = find_bridge(resource);
- if (bridge == NULL) {
+ if (!bridge) {
printk(KERN_ERR "Can't find bridge\n");
return;
}

- if (bridge->parent == NULL) {
+ if (!bridge->parent) {
printk(KERN_ERR "Dev entry NULL for bridge %s\n", bridge->name);
return;
}

- if (bridge->free_consistent == NULL) {
+ if (!bridge->free_consistent) {
printk(KERN_ERR "free_consistent not supported by bridge %s\n",
bridge->name);
return;
@@ -303,7 +303,7 @@ struct vme_resource *vme_slave_request(struct vme_dev *vdev, u32 address,
struct vme_resource *resource = NULL;

bridge = vdev->bridge;
- if (bridge == NULL) {
+ if (!bridge) {
printk(KERN_ERR "Can't find VME bus\n");
goto err_bus;
}
@@ -313,7 +313,7 @@ struct vme_resource *vme_slave_request(struct vme_dev *vdev, u32 address,
slave_image = list_entry(slave_pos,
struct vme_slave_resource, list);

- if (slave_image == NULL) {
+ if (!slave_image) {
printk(KERN_ERR "Registered NULL Slave resource\n");
continue;
}
@@ -333,7 +333,7 @@ struct vme_resource *vme_slave_request(struct vme_dev *vdev, u32 address,
}

/* No free image */
- if (allocated_image == NULL)
+ if (!allocated_image)
goto err_image;

resource = kmalloc(sizeof(*resource), GFP_KERNEL);
@@ -388,7 +388,7 @@ int vme_slave_set(struct vme_resource *resource, int enabled,

image = list_entry(resource->entry, struct vme_slave_resource, list);

- if (bridge->slave_set == NULL) {
+ if (!bridge->slave_set) {
printk(KERN_ERR "Function not supported\n");
return -ENOSYS;
}
@@ -437,7 +437,7 @@ int vme_slave_get(struct vme_resource *resource, int *enabled,

image = list_entry(resource->entry, struct vme_slave_resource, list);

- if (bridge->slave_get == NULL) {
+ if (!bridge->slave_get) {
printk(KERN_ERR "vme_slave_get not supported\n");
return -EINVAL;
}
@@ -464,7 +464,7 @@ void vme_slave_free(struct vme_resource *resource)

slave_image = list_entry(resource->entry, struct vme_slave_resource,
list);
- if (slave_image == NULL) {
+ if (!slave_image) {
printk(KERN_ERR "Can't find slave resource\n");
return;
}
@@ -504,7 +504,7 @@ struct vme_resource *vme_master_request(struct vme_dev *vdev, u32 address,
struct vme_resource *resource = NULL;

bridge = vdev->bridge;
- if (bridge == NULL) {
+ if (!bridge) {
printk(KERN_ERR "Can't find VME bus\n");
goto err_bus;
}
@@ -514,7 +514,7 @@ struct vme_resource *vme_master_request(struct vme_dev *vdev, u32 address,
master_image = list_entry(master_pos,
struct vme_master_resource, list);

- if (master_image == NULL) {
+ if (!master_image) {
printk(KERN_WARNING "Registered NULL master resource\n");
continue;
}
@@ -535,7 +535,7 @@ struct vme_resource *vme_master_request(struct vme_dev *vdev, u32 address,
}

/* Check to see if we found a resource */
- if (allocated_image == NULL) {
+ if (!allocated_image) {
printk(KERN_ERR "Can't find a suitable resource\n");
goto err_image;
}
@@ -592,7 +592,7 @@ int vme_master_set(struct vme_resource *resource, int enabled,

image = list_entry(resource->entry, struct vme_master_resource, list);

- if (bridge->master_set == NULL) {
+ if (!bridge->master_set) {
printk(KERN_WARNING "vme_master_set not supported\n");
return -EINVAL;
}
@@ -642,7 +642,7 @@ int vme_master_get(struct vme_resource *resource, int *enabled,

image = list_entry(resource->entry, struct vme_master_resource, list);

- if (bridge->master_get == NULL) {
+ if (!bridge->master_get) {
printk(KERN_WARNING "%s not supported\n", __func__);
return -EINVAL;
}
@@ -674,7 +674,7 @@ ssize_t vme_master_read(struct vme_resource *resource, void *buf, size_t count,
struct vme_master_resource *image;
size_t length;

- if (bridge->master_read == NULL) {
+ if (!bridge->master_read) {
printk(KERN_WARNING "Reading from resource not supported\n");
return -EINVAL;
}
@@ -723,7 +723,7 @@ ssize_t vme_master_write(struct vme_resource *resource, void *buf,
struct vme_master_resource *image;
size_t length;

- if (bridge->master_write == NULL) {
+ if (!bridge->master_write) {
printk(KERN_WARNING "Writing to resource not supported\n");
return -EINVAL;
}
@@ -774,7 +774,7 @@ unsigned int vme_master_rmw(struct vme_resource *resource, unsigned int mask,
struct vme_bridge *bridge = find_bridge(resource);
struct vme_master_resource *image;

- if (bridge->master_rmw == NULL) {
+ if (!bridge->master_rmw) {
printk(KERN_WARNING "Writing to resource not supported\n");
return -EINVAL;
}
@@ -844,7 +844,7 @@ void vme_master_free(struct vme_resource *resource)

master_image = list_entry(resource->entry, struct vme_master_resource,
list);
- if (master_image == NULL) {
+ if (!master_image) {
printk(KERN_ERR "Can't find master resource\n");
return;
}
@@ -884,7 +884,7 @@ struct vme_resource *vme_dma_request(struct vme_dev *vdev, u32 route)
printk(KERN_ERR "No VME resource Attribute tests done\n");

bridge = vdev->bridge;
- if (bridge == NULL) {
+ if (!bridge) {
printk(KERN_ERR "Can't find VME bus\n");
goto err_bus;
}
@@ -893,8 +893,7 @@ struct vme_resource *vme_dma_request(struct vme_dev *vdev, u32 route)
list_for_each(dma_pos, &bridge->dma_resources) {
dma_ctrlr = list_entry(dma_pos,
struct vme_dma_resource, list);
-
- if (dma_ctrlr == NULL) {
+ if (!dma_ctrlr) {
printk(KERN_ERR "Registered NULL DMA resource\n");
continue;
}
@@ -913,7 +912,7 @@ struct vme_resource *vme_dma_request(struct vme_dev *vdev, u32 route)
}

/* Check to see if we found a resource */
- if (allocated_ctrlr == NULL)
+ if (!allocated_ctrlr)
goto err_ctrlr;

resource = kmalloc(sizeof(*resource), GFP_KERNEL);
@@ -1128,7 +1127,7 @@ int vme_dma_list_add(struct vme_dma_list *list, struct vme_dma_attr *src,
struct vme_bridge *bridge = list->parent->parent;
int retval;

- if (bridge->dma_list_add == NULL) {
+ if (!bridge->dma_list_add) {
printk(KERN_WARNING "Link List DMA generation not supported\n");
return -EINVAL;
}
@@ -1161,7 +1160,7 @@ int vme_dma_list_exec(struct vme_dma_list *list)
struct vme_bridge *bridge = list->parent->parent;
int retval;

- if (bridge->dma_list_exec == NULL) {
+ if (!bridge->dma_list_exec) {
printk(KERN_ERR "Link List DMA execution not supported\n");
return -EINVAL;
}
@@ -1190,7 +1189,7 @@ int vme_dma_list_free(struct vme_dma_list *list)
struct vme_bridge *bridge = list->parent->parent;
int retval;

- if (bridge->dma_list_empty == NULL) {
+ if (!bridge->dma_list_empty) {
printk(KERN_WARNING "Emptying of Link Lists not supported\n");
return -EINVAL;
}
@@ -1322,8 +1321,7 @@ void vme_irq_handler(struct vme_bridge *bridge, int level, int statid)

call = bridge->irq[level - 1].callback[statid].func;
priv_data = bridge->irq[level - 1].callback[statid].priv_data;
-
- if (call != NULL)
+ if (call)
call(level, statid, priv_data);
else
printk(KERN_WARNING "Spurious VME interrupt, level:%x, vector:%x\n",
@@ -1354,7 +1352,7 @@ int vme_irq_request(struct vme_dev *vdev, int level, int statid,
struct vme_bridge *bridge;

bridge = vdev->bridge;
- if (bridge == NULL) {
+ if (!bridge) {
printk(KERN_ERR "Can't find VME bus\n");
return -EINVAL;
}
@@ -1364,7 +1362,7 @@ int vme_irq_request(struct vme_dev *vdev, int level, int statid,
return -EINVAL;
}

- if (bridge->irq_set == NULL) {
+ if (!bridge->irq_set) {
printk(KERN_ERR "Configuring interrupts not supported\n");
return -EINVAL;
}
@@ -1403,7 +1401,7 @@ void vme_irq_free(struct vme_dev *vdev, int level, int statid)
struct vme_bridge *bridge;

bridge = vdev->bridge;
- if (bridge == NULL) {
+ if (!bridge) {
printk(KERN_ERR "Can't find VME bus\n");
return;
}
@@ -1413,7 +1411,7 @@ void vme_irq_free(struct vme_dev *vdev, int level, int statid)
return;
}

- if (bridge->irq_set == NULL) {
+ if (!bridge->irq_set) {
printk(KERN_ERR "Configuring interrupts not supported\n");
return;
}
@@ -1450,7 +1448,7 @@ int vme_irq_generate(struct vme_dev *vdev, int level, int statid)
struct vme_bridge *bridge;

bridge = vdev->bridge;
- if (bridge == NULL) {
+ if (!bridge) {
printk(KERN_ERR "Can't find VME bus\n");
return -EINVAL;
}
@@ -1460,7 +1458,7 @@ int vme_irq_generate(struct vme_dev *vdev, int level, int statid)
return -EINVAL;
}

- if (bridge->irq_generate == NULL) {
+ if (!bridge->irq_generate) {
printk(KERN_WARNING "Interrupt generation not supported\n");
return -EINVAL;
}
@@ -1488,7 +1486,7 @@ struct vme_resource *vme_lm_request(struct vme_dev *vdev)
struct vme_resource *resource = NULL;

bridge = vdev->bridge;
- if (bridge == NULL) {
+ if (!bridge) {
printk(KERN_ERR "Can't find VME bus\n");
goto err_bus;
}
@@ -1497,8 +1495,7 @@ struct vme_resource *vme_lm_request(struct vme_dev *vdev)
list_for_each(lm_pos, &bridge->lm_resources) {
lm = list_entry(lm_pos,
struct vme_lm_resource, list);
-
- if (lm == NULL) {
+ if (!lm) {
printk(KERN_ERR "Registered NULL Location Monitor resource\n");
continue;
}
@@ -1515,7 +1512,7 @@ struct vme_resource *vme_lm_request(struct vme_dev *vdev)
}

/* Check to see if we found a resource */
- if (allocated_lm == NULL)
+ if (!allocated_lm)
goto err_lm;

resource = kmalloc(sizeof(*resource), GFP_KERNEL);
@@ -1591,7 +1588,7 @@ int vme_lm_set(struct vme_resource *resource, unsigned long long lm_base,

lm = list_entry(resource->entry, struct vme_lm_resource, list);

- if (bridge->lm_set == NULL) {
+ if (!bridge->lm_set) {
printk(KERN_ERR "vme_lm_set not supported\n");
return -EINVAL;
}
@@ -1627,7 +1624,7 @@ int vme_lm_get(struct vme_resource *resource, unsigned long long *lm_base,

lm = list_entry(resource->entry, struct vme_lm_resource, list);

- if (bridge->lm_get == NULL) {
+ if (!bridge->lm_get) {
printk(KERN_ERR "vme_lm_get not supported\n");
return -EINVAL;
}
@@ -1664,7 +1661,7 @@ int vme_lm_attach(struct vme_resource *resource, int monitor,

lm = list_entry(resource->entry, struct vme_lm_resource, list);

- if (bridge->lm_attach == NULL) {
+ if (!bridge->lm_attach) {
printk(KERN_ERR "vme_lm_attach not supported\n");
return -EINVAL;
}
@@ -1697,7 +1694,7 @@ int vme_lm_detach(struct vme_resource *resource, int monitor)

lm = list_entry(resource->entry, struct vme_lm_resource, list);

- if (bridge->lm_detach == NULL) {
+ if (!bridge->lm_detach) {
printk(KERN_ERR "vme_lm_detach not supported\n");
return -EINVAL;
}
@@ -1759,12 +1756,12 @@ int vme_slot_num(struct vme_dev *vdev)
struct vme_bridge *bridge;

bridge = vdev->bridge;
- if (bridge == NULL) {
+ if (!bridge) {
printk(KERN_ERR "Can't find VME bus\n");
return -EINVAL;
}

- if (bridge->slot_get == NULL) {
+ if (!bridge->slot_get) {
printk(KERN_WARNING "vme_slot_num not supported\n");
return -EINVAL;
}
@@ -1787,7 +1784,7 @@ int vme_bus_num(struct vme_dev *vdev)
struct vme_bridge *bridge;

bridge = vdev->bridge;
- if (bridge == NULL) {
+ if (!bridge) {
pr_err("Can't find VME bus\n");
return -EINVAL;
}
@@ -2004,8 +2001,7 @@ static int vme_bus_probe(struct device *dev)
struct vme_dev *vdev = dev_to_vme_dev(dev);

driver = dev->platform_data;
-
- if (driver->probe != NULL)
+ if (driver->probe)
retval = driver->probe(vdev);

return retval;
@@ -2018,8 +2014,7 @@ static int vme_bus_remove(struct device *dev)
struct vme_dev *vdev = dev_to_vme_dev(dev);

driver = dev->platform_data;
-
- if (driver->remove != NULL)
+ if (driver->remove)
retval = driver->remove(vdev);

return retval;
--
2.14.0

Next message: Ard Biesheuvel: "[GIT PULL 0/5] more EFI changes for v4.14"
Previous message: Kirill A. Shutemov: "Re: [PATCH v6 3/5] mm: introduce mmap3 for safely defining new mmap flags"
In reply to: SF Markus Elfring: "[PATCH 03/14] vme: Move an assignment in vme_new_dma_list()"
Next in thread: SF Markus Elfring: "[PATCH 05/14] vme: Return directly in two functions"
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