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Ref count the sysdev class to support multiple DRM cards

main
Jon Smirl 2005-06-24 22:48:16 +00:00
parent 2b845f25c5
commit 9deb276a06
1 changed files with 17 additions and 4 deletions
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21
linux-core/drm_pm.c
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@ -67,7 +67,7 @@ static int shutdown(struct sys_device *sysdev)
return 0;
}
static int sysdev_loaded = 0;
static atomic_t sysdev_loaded = ATOMIC_INIT(-1);
static struct sysdev_class drm_sysdev_class = {
set_kset_name("drm"),
.resume = drm_resume,
@ -124,14 +124,27 @@ int drm_pm_init(void)
int rc;
DRM_DEBUG("\n");
if (!(rc = sysdev_class_register(&drm_sysdev_class)))
sysdev_loaded = 1;
/* triggers on -1 to 0 transition */
if (!atomic_inc_and_test(&sysdev_loaded))
return 0;
if ((rc = sysdev_class_register(&drm_sysdev_class))) {
/* reset it back to -1 */
atomic_dec(&sysdev_loaded);
} else {
/* inc it up to 1 so that unload will trigger on 1->0 */
atomic_inc(&sysdev_loaded);
DRM_DEBUG("registered\n");
}
return rc;
}
void __exit drm_pm_exit(void)
{
DRM_DEBUG("\n");
if (sysdev_loaded)
/* triggers on the 1 to 0 transistion */
if (atomic_dec_and_test(&sysdev_loaded)) {
sysdev_class_unregister(&drm_sysdev_class);
DRM_DEBUG("unregisted\n");
}
}