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authorChris Wilson <chris@chris-wilson.co.uk>2010-08-04 11:09:42 +0100
committerDave Airlie <airlied@redhat.com>2010-08-05 08:42:19 +1000
commit3fb688fdc1890f9e8e97597f690c145ab888aec0 (patch)
tree51d00db10f866092486ccde2ec20ac794c8f2651 /drivers/gpu/drm/drm_ioctl.c
parentdc77de12dde95c8da39e4c417eb70c7d445cf84b (diff)
drm: Cleanup after failing to create master->unique and dev->name
v2: Userspace (notably xf86-video-{intel,ati}) became confused when drmSetInterfaceVersion() started returning -EBUSY as they used a second call (the first done in drmOpen()) to check their master credentials. Since userspace wants to be able to repeatedly call drmSetInterfaceVersion() allow them to do so. v3: Rebase to drm-core-next. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'drivers/gpu/drm/drm_ioctl.c')
-rw-r--r--drivers/gpu/drm/drm_ioctl.c85
1 files changed, 66 insertions, 19 deletions
diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c
index 76d3d18056dd..7b03b197fc00 100644
--- a/drivers/gpu/drm/drm_ioctl.c
+++ b/drivers/gpu/drm/drm_ioctl.c
@@ -64,6 +64,19 @@ int drm_getunique(struct drm_device *dev, void *data,
return 0;
}
+static void
+drm_unset_busid(struct drm_device *dev,
+ struct drm_master *master)
+{
+ kfree(dev->devname);
+ dev->devname = NULL;
+
+ kfree(master->unique);
+ master->unique = NULL;
+ master->unique_len = 0;
+ master->unique_size = 0;
+}
+
/**
* Set the bus id.
*
@@ -94,17 +107,24 @@ int drm_setunique(struct drm_device *dev, void *data,
master->unique_len = u->unique_len;
master->unique_size = u->unique_len + 1;
master->unique = kmalloc(master->unique_size, GFP_KERNEL);
- if (!master->unique)
- return -ENOMEM;
- if (copy_from_user(master->unique, u->unique, master->unique_len))
- return -EFAULT;
+ if (!master->unique) {
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ if (copy_from_user(master->unique, u->unique, master->unique_len)) {
+ ret = -EFAULT;
+ goto err;
+ }
master->unique[master->unique_len] = '\0';
dev->devname = kmalloc(strlen(dev->driver->pci_driver.name) +
strlen(master->unique) + 2, GFP_KERNEL);
- if (!dev->devname)
- return -ENOMEM;
+ if (!dev->devname) {
+ ret = -ENOMEM;
+ goto err;
+ }
sprintf(dev->devname, "%s@%s", dev->driver->pci_driver.name,
master->unique);
@@ -113,24 +133,36 @@ int drm_setunique(struct drm_device *dev, void *data,
* busid.
*/
ret = sscanf(master->unique, "PCI:%d:%d:%d", &bus, &slot, &func);
- if (ret != 3)
- return -EINVAL;
+ if (ret != 3) {
+ ret = -EINVAL;
+ goto err;
+ }
+
domain = bus >> 8;
bus &= 0xff;
if ((domain != drm_get_pci_domain(dev)) ||
(bus != dev->pdev->bus->number) ||
(slot != PCI_SLOT(dev->pdev->devfn)) ||
- (func != PCI_FUNC(dev->pdev->devfn)))
- return -EINVAL;
+ (func != PCI_FUNC(dev->pdev->devfn))) {
+ ret = -EINVAL;
+ goto err;
+ }
return 0;
+
+err:
+ drm_unset_busid(dev, master);
+ return ret;
}
static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv)
{
struct drm_master *master = file_priv->master;
- int len;
+ int len, ret;
+
+ if (master->unique != NULL)
+ drm_unset_busid(dev, master);
if (drm_core_check_feature(dev, DRIVER_USE_PLATFORM_DEVICE)) {
master->unique_len = 10 + strlen(dev->platformdev->name);
@@ -142,15 +174,20 @@ static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv)
len = snprintf(master->unique, master->unique_len,
"platform:%s", dev->platformdev->name);
- if (len > master->unique_len)
+ if (len > master->unique_len) {
DRM_ERROR("Unique buffer overflowed\n");
+ ret = -EINVAL;
+ goto err;
+ }
dev->devname =
kmalloc(strlen(dev->platformdev->name) +
master->unique_len + 2, GFP_KERNEL);
- if (dev->devname == NULL)
- return -ENOMEM;
+ if (dev->devname == NULL) {
+ ret = -ENOMEM;
+ goto err;
+ }
sprintf(dev->devname, "%s@%s", dev->platformdev->name,
master->unique);
@@ -168,23 +205,31 @@ static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv)
dev->pdev->bus->number,
PCI_SLOT(dev->pdev->devfn),
PCI_FUNC(dev->pdev->devfn));
- if (len >= master->unique_len)
+ if (len >= master->unique_len) {
DRM_ERROR("buffer overflow");
- else
+ ret = -EINVAL;
+ goto err;
+ } else
master->unique_len = len;
dev->devname =
kmalloc(strlen(dev->driver->pci_driver.name) +
master->unique_len + 2, GFP_KERNEL);
- if (dev->devname == NULL)
- return -ENOMEM;
+ if (dev->devname == NULL) {
+ ret = -ENOMEM;
+ goto err;
+ }
sprintf(dev->devname, "%s@%s", dev->driver->pci_driver.name,
master->unique);
}
return 0;
+
+err:
+ drm_unset_busid(dev, master);
+ return ret;
}
/**
@@ -348,7 +393,9 @@ int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_pri
/*
* Version 1.1 includes tying of DRM to specific device
*/
- drm_set_busid(dev, file_priv);
+ retcode = drm_set_busid(dev, file_priv);
+ if (retcode)
+ goto done;
}
}