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SubjectRe: kernfs/rtc: circular dependency between kernfs and ops_lock
On Sat, 22 Feb 2014 15:52:17 -0500
Tejun Heo <> wrote:

> The problem is rtc_device_unregister(). It grabs rtc->ops_lock and
> then tries to remove the sysfs files. Some of those sysfs file
> implementations acquire rtc->ops_lock, so it of course can lead to
> deadlocks. One can't try to delete a sysfs file which acquires a lock
> while holding the same lock.

Pretty interesting indeed. One option would be to remove
the sys files before acquiring the lock. But I wonder
if this could lead to other issues.


Best regards,

Alessandro Zummo,
Tower Technologies - Torino, Italy

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