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drm: store encoder name in encoder struct 

This makes drm_get_encoder_name() thread safe.

Reference: http://lkml.kernel.org/r/645ee6e22cad47d38a2b35c21c8d5fe3@DC1-MBX-01\
.ptsecurity.ru
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Jani Nikula 2014-05-14 16:58:20 +03:00 committed by Dave Airlie
parent 2abdd3137e
commit e5748946e9
2 changed files with 19 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
drivers/gpu/drm/drm_crtc.c
View File

@ -257,21 +257,11 @@ void drm_connector_ida_destroy(void)
/**
* drm_get_encoder_name - return a string for encoder
* @encoder: encoder to compute name of
*
* Note that the buffer used by this function is globally shared and owned by
* the function itself.
*
* FIXME: This isn't really multithreading safe.
* @encoder: the encoder to get name for
*/
const char *drm_get_encoder_name(const struct drm_encoder *encoder)
{
static char buf[32];
snprintf(buf, 32, "%s-%d",
drm_encoder_enum_list[encoder->encoder_type].name,
encoder->base.id);
return buf;
return encoder->name;
}
EXPORT_SYMBOL(drm_get_encoder_name);
@ -986,16 +976,27 @@ int drm_encoder_init(struct drm_device *dev,
ret = drm_mode_object_get(dev, &encoder->base, DRM_MODE_OBJECT_ENCODER);
if (ret)
goto out;
goto out_unlock;
encoder->dev = dev;
encoder->encoder_type = encoder_type;
encoder->funcs = funcs;
encoder->name = kasprintf(GFP_KERNEL, "%s-%d",
drm_encoder_enum_list[encoder_type].name,
encoder->base.id);
if (!encoder->name) {
ret = -ENOMEM;
goto out_put;
}
list_add_tail(&encoder->head, &dev->mode_config.encoder_list);
dev->mode_config.num_encoder++;
out:
out_put:
if (ret)
drm_mode_object_put(dev, &encoder->base);
out_unlock:
drm_modeset_unlock_all(dev);
return ret;
@ -1013,6 +1014,8 @@ void drm_encoder_cleanup(struct drm_encoder *encoder)
struct drm_device *dev = encoder->dev;
drm_modeset_lock_all(dev);
drm_mode_object_put(dev, &encoder->base);
kfree(encoder->name);
encoder->name = NULL;
list_del(&encoder->head);
dev->mode_config.num_encoder--;
drm_modeset_unlock_all(dev);

2
include/drm/drm_crtc.h
View File

@ -400,6 +400,7 @@ struct drm_encoder_funcs {
* @dev: parent DRM device
* @head: list management
* @base: base KMS object
* @name: encoder name
* @encoder_type: one of the %DRM_MODE_ENCODER_<foo> types in drm_mode.h
* @possible_crtcs: bitmask of potential CRTC bindings
* @possible_clones: bitmask of potential sibling encoders for cloning
@ -416,6 +417,7 @@ struct drm_encoder {
struct list_head head;
struct drm_mode_object base;
char *name;
int encoder_type;
uint32_t possible_crtcs;
uint32_t possible_clones;