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authorMarcin Slusarz <marcin.slusarz@gmail.com>2011-11-10 01:20:35 +0400
committerDave Airlie <airlied@redhat.com>2011-11-11 15:05:19 +0400
commitb3e067c0b276197b59046d7095b01b99f98b2821 (patch)
tree90a260a3a560e0f06398db84ebe3feb27d569128
parent3b9832f662d195755e7308f92368d44458268457 (diff)
downloadlinux-b3e067c0b276197b59046d7095b01b99f98b2821.tar.xz
drm: serialize access to list of debugfs files
Nouveau, when configured with debugfs, creates debugfs files for every channel, so structure holding list of files needs to be protected from simultaneous changes by multiple threads. Without this patch it's possible to hit kernel oops in drm_debugfs_remove_files just by running a couple of xterms with looped glxinfo. Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: Dave Airlie <airlied@redhat.com>
-rw-r--r--drivers/gpu/drm/drm_debugfs.c12
-rw-r--r--drivers/gpu/drm/i915/i915_debugfs.c5
-rw-r--r--include/drm/drmP.h4
3 files changed, 16 insertions, 5 deletions
diff --git a/drivers/gpu/drm/drm_debugfs.c b/drivers/gpu/drm/drm_debugfs.c
index d067c12ba940..1c7a1c0d3edd 100644
--- a/drivers/gpu/drm/drm_debugfs.c
+++ b/drivers/gpu/drm/drm_debugfs.c
@@ -118,7 +118,10 @@ int drm_debugfs_create_files(struct drm_info_list *files, int count,
tmp->minor = minor;
tmp->dent = ent;
tmp->info_ent = &files[i];
- list_add(&(tmp->list), &(minor->debugfs_nodes.list));
+
+ mutex_lock(&minor->debugfs_lock);
+ list_add(&tmp->list, &minor->debugfs_list);
+ mutex_unlock(&minor->debugfs_lock);
}
return 0;
@@ -146,7 +149,8 @@ int drm_debugfs_init(struct drm_minor *minor, int minor_id,
char name[64];
int ret;
- INIT_LIST_HEAD(&minor->debugfs_nodes.list);
+ INIT_LIST_HEAD(&minor->debugfs_list);
+ mutex_init(&minor->debugfs_lock);
sprintf(name, "%d", minor_id);
minor->debugfs_root = debugfs_create_dir(name, root);
if (!minor->debugfs_root) {
@@ -192,8 +196,9 @@ int drm_debugfs_remove_files(struct drm_info_list *files, int count,
struct drm_info_node *tmp;
int i;
+ mutex_lock(&minor->debugfs_lock);
for (i = 0; i < count; i++) {
- list_for_each_safe(pos, q, &minor->debugfs_nodes.list) {
+ list_for_each_safe(pos, q, &minor->debugfs_list) {
tmp = list_entry(pos, struct drm_info_node, list);
if (tmp->info_ent == &files[i]) {
debugfs_remove(tmp->dent);
@@ -202,6 +207,7 @@ int drm_debugfs_remove_files(struct drm_info_list *files, int count,
}
}
}
+ mutex_unlock(&minor->debugfs_lock);
return 0;
}
EXPORT_SYMBOL(drm_debugfs_remove_files);
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index d14b44e13f51..4f40f1ce1d8e 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -1506,7 +1506,10 @@ drm_add_fake_info_node(struct drm_minor *minor,
node->minor = minor;
node->dent = ent;
node->info_ent = (void *) key;
- list_add(&node->list, &minor->debugfs_nodes.list);
+
+ mutex_lock(&minor->debugfs_lock);
+ list_add(&node->list, &minor->debugfs_list);
+ mutex_unlock(&minor->debugfs_lock);
return 0;
}
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index cf399495d38f..1f9e9516e2b7 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -990,7 +990,9 @@ struct drm_minor {
struct proc_dir_entry *proc_root; /**< proc directory entry */
struct drm_info_node proc_nodes;
struct dentry *debugfs_root;
- struct drm_info_node debugfs_nodes;
+
+ struct list_head debugfs_list;
+ struct mutex debugfs_lock; /* Protects debugfs_list. */
struct drm_master *master; /* currently active master for this node */
struct list_head master_list;