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drm: simplify drm_*_set_unique()

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Lets use kasprintf() to avoid pre-allocating the buffer. This is really
nothing to optimize for speed and the input is trusted, so kasprintf() is
just fine.

Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Reviewed-by: Thierry Reding <treding@nvidia.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
David Herrmann 2014-08-29 12:12:41 +02:00 committed by Dave Airlie
parent d7d2c48e5c
commit d0a39164b6
2 changed files with 16 additions and 45 deletions
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30
drivers/gpu/drm/drm_pci.c
View File

@ -129,31 +129,17 @@ static int drm_get_pci_domain(struct drm_device *dev)
static int drm_pci_set_busid(struct drm_device *dev, struct drm_master *master)
{
int len, ret;
master->unique_len = 40;
master->unique_size = master->unique_len;
master->unique = kmalloc(master->unique_size, GFP_KERNEL);
if (master->unique == NULL)
master->unique = kasprintf(GFP_KERNEL, "pci:%04x:%02x:%02x.%d",
drm_get_pci_domain(dev),
dev->pdev->bus->number,
PCI_SLOT(dev->pdev->devfn),
PCI_FUNC(dev->pdev->devfn));
if (!master->unique)
return -ENOMEM;
len = snprintf(master->unique, master->unique_len,
"pci:%04x:%02x:%02x.%d",
drm_get_pci_domain(dev),
dev->pdev->bus->number,
PCI_SLOT(dev->pdev->devfn),
PCI_FUNC(dev->pdev->devfn));
if (len >= master->unique_len) {
DRM_ERROR("buffer overflow");
ret = -EINVAL;
goto err;
} else
master->unique_len = len;
master->unique_len = strlen(master->unique);
master->unique_size = master->unique_len + 1;
return 0;
err:
return ret;
}
int drm_pci_set_unique(struct drm_device *dev,

31
drivers/gpu/drm/drm_platform.c
View File

@ -70,35 +70,20 @@ static int drm_get_platform_dev(struct platform_device *platdev,
static int drm_platform_set_busid(struct drm_device *dev, struct drm_master *master)
{
int len, ret, id;
master->unique_len = 13 + strlen(dev->platformdev->name);
master->unique_size = master->unique_len;
master->unique = kmalloc(master->unique_len + 1, GFP_KERNEL);
if (master->unique == NULL)
return -ENOMEM;
int id;
id = dev->platformdev->id;
/* if only a single instance of the platform device, id will be
* set to -1.. use 0 instead to avoid a funny looking bus-id:
*/
if (id == -1)
if (id < 0)
id = 0;
len = snprintf(master->unique, master->unique_len,
"platform:%s:%02d", dev->platformdev->name, id);
if (len > master->unique_len) {
DRM_ERROR("Unique buffer overflowed\n");
ret = -EINVAL;
goto err;
}
master->unique = kasprintf(GFP_KERNEL, "platform:%s:%02d",
dev->platformdev->name, id);
if (!master->unique)
return -ENOMEM;
master->unique_len = strlen(master->unique);
master->unique_size = master->unique_len;
return 0;
err:
return ret;
}
static struct drm_bus drm_platform_bus = {