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 --- drivers/gpu/drm/drm_ioctl.c | 85 +++++++++++++++++++++++++++++++++---------- 1 files changed, 66 insertions(+), 19 deletions(-)

diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c index 76d3d18..7b03b19 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; } }