Re: [PATCH 2/2] loop : Don't hold the lo_ctl_mutex while fput inloop_clr_fd

[Al Viro]

On Mon, Apr 28, 2008 at 10:10:22AM +0800, Dave Young wrote:
> [Fixing bug 10504]
> 
> If the bakingfile is a block device file, losetuo -d will trigger lockdep
> warning of "circular locking dependency".
> 
> open/release lock order : bdev->bd_mutex ---> lo->lo_ctl_mutex
> loop_clr_fd lock order  : lo->lo_ctl_mutex ---> bdev->bd_mutex (fput)
> 
> Don't hold the lo_ctl_mutex while fput in loop_clr_fd to fix it. It's safe
> because all loop device state will be consistent here.

Explain.
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