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w1 - call request_module with w1 master mutex unlocked

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request_module for w1 slave modules needs to be called with the w1
master mutex unlocked. Because w1_attach_slave_device gets always(?)
called with mutex locked, we need to temporarily unlock the w1 master
mutex for the loading of the w1 slave module.

Signed-off by: Hans-Frieder Vogt <hfvogt@gmx.net>
Acked-by: Evgeniy Polyakov <zbr@ioremap.net>
Cc: stable <stable@vger.kernel.org> # 3.11+

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Hans-Frieder Vogt 2013-10-06 21:13:40 +02:00 committed by Greg Kroah-Hartman
parent 2962aecef2
commit bc04d76d69
1 changed files with 3 additions and 0 deletions
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3
drivers/w1/w1.c
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@ -716,7 +716,10 @@ static int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn)
atomic_set(&sl->refcnt, 0);
init_completion(&sl->released);
/* slave modules need to be loaded in a context with unlocked mutex */
mutex_unlock(&dev->mutex);
request_module("w1-family-0x%0x", rn->family);
mutex_lock(&dev->mutex);
spin_lock(&w1_flock);
f = w1_family_registered(rn->family);