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| author | Marcin Slusarz <marcin.slusarz@gmail.com> | 2011-11-09 22:20:35 +0100 |
|---|---|---|
| committer | Dave Airlie <airlied@redhat.com> | 2011-11-11 11:05:19 +0000 |
| commit | b3e067c0b276197b59046d7095b01b99f98b2821 (patch) | |
| tree | 90a260a3a560e0f06398db84ebe3feb27d569128 /drivers/gpu/drm/drm_debugfs.c | |
| parent | 3b9832f662d195755e7308f92368d44458268457 (diff) | |
| download | blackbird-op-linux-b3e067c0b276197b59046d7095b01b99f98b2821.tar.gz blackbird-op-linux-b3e067c0b276197b59046d7095b01b99f98b2821.zip | |
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>
Diffstat (limited to 'drivers/gpu/drm/drm_debugfs.c')
| -rw-r--r-- | drivers/gpu/drm/drm_debugfs.c | 12 |
1 files changed, 9 insertions, 3 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); |
