Hi,
bd_mount_sem can protect against only freezes and cannot protect against
unfreezes. If multiple unfreezes run in parallel, the multiple up() for
bd_mount_sem might occur incorrectly.
Indeed. The bit flag would fix that because unfreeze could then check
for the bit beeing set first. So that's probably the easiest way to go.
I think the bit flag is more efficient than the semaphore.
So I will consider whether it can be used for the freeze feature.
Cheers, Takashi
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