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SubjectRe: [PATCH] w1: Introduce a slave mutex for serializing IO.
On Wed, May 09, 2012 at 11:43:49AM +1000, NeilBrown ( wrote:
> However lockdep didn't like it. There are ordering problems between this
> mutex and and sysfs's s_active.
> When you access battery properies via sysfs, the sysfs lock is taken first,
> then the master->mutex.
> When w1_reconnect_slaves calls through to device_del and sys_addrm_finish,
> the mutex is held while the sysfs lock is wanted.

I only came to idea of not allowing sysfs in ->probe() and instead
introduce new callback, which will initialize 'external' to w1 core
parts without holding master's mutex

Evgeniy Polyakov

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