@@ -2178,7 +2178,9 @@ int i915_gem_context_create_ioctl(struct drm_device *dev, void *data,
{
struct drm_i915_private *i915 = to_i915(dev);
struct drm_i915_gem_context_create_ext *args = data;
+ struct drm_i915_file_private *file_priv = file->driver_priv;
struct create_ext ext_data;
+ struct pid *pid;
int ret;
if (!DRIVER_CAPS(i915)->has_logical_contexts)
@@ -2191,14 +2193,30 @@ int i915_gem_context_create_ioctl(struct drm_device *dev, void *data,
if (ret)
return ret;
- ext_data.fpriv = file->driver_priv;
+ ext_data.fpriv = file_priv;
+ pid = get_task_pid(current, PIDTYPE_PID);
if (client_is_banned(ext_data.fpriv)) {
DRM_DEBUG("client %s[%d] banned from creating ctx\n",
- current->comm,
- pid_nr(get_task_pid(current, PIDTYPE_PID)));
+ current->comm, pid_nr(pid));
+ put_pid(pid);
return -EIO;
}
+ /*
+ * Borrow the context idr_lock to protect the client remove-add cycle.
+ */
+ if (mutex_lock_interruptible(&file_priv->context_idr_lock))
+ return -EINTR;
+ if (pid_nr(file_priv->client.pid) != pid_nr(pid)) {
+ i915_gem_remove_client(file_priv);
+ ret = i915_gem_add_client(i915, file_priv, current,
+ file_priv->client.id);
+ }
+ mutex_unlock(&file_priv->context_idr_lock);
+ put_pid(pid);
+ if (ret)
+ return ret;
+
ext_data.ctx = i915_gem_create_context(i915, args->flags);
if (IS_ERR(ext_data.ctx))
return PTR_ERR(ext_data.ctx);
@@ -1899,6 +1899,13 @@ void i915_gem_suspend(struct drm_i915_private *dev_priv);
void i915_gem_suspend_late(struct drm_i915_private *dev_priv);
void i915_gem_resume(struct drm_i915_private *dev_priv);
+int
+i915_gem_add_client(struct drm_i915_private *i915,
+ struct drm_i915_file_private *file_priv,
+ struct task_struct *task,
+ unsigned int serial);
+void i915_gem_remove_client(struct drm_i915_file_private *file_priv);
+
int i915_gem_open(struct drm_i915_private *i915, struct drm_file *file);
void i915_gem_release(struct drm_device *dev, struct drm_file *file);
@@ -1541,7 +1541,7 @@ show_client_pid(struct device *kdev, struct device_attribute *attr, char *buf)
return snprintf(buf, PAGE_SIZE, "%u", pid_nr(file_priv->client.pid));
}
-static int
+int
i915_gem_add_client(struct drm_i915_private *i915,
struct drm_i915_file_private *file_priv,
struct task_struct *task,
@@ -1600,7 +1600,7 @@ i915_gem_add_client(struct drm_i915_private *i915,
return ret;
}
-static void i915_gem_remove_client(struct drm_i915_file_private *file_priv)
+void i915_gem_remove_client(struct drm_i915_file_private *file_priv)
{
struct i915_drm_clients *clients = &file_priv->dev_priv->clients;
struct i915_drm_client *client = &file_priv->client;