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w1 - call request_module with w1 master mutex unlocked
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>
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@ -716,7 +716,10 @@ static int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn)
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atomic_set(&sl->refcnt, 0);
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init_completion(&sl->released);
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/* slave modules need to be loaded in a context with unlocked mutex */
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mutex_unlock(&dev->mutex);
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request_module("w1-family-0x%0x", rn->family);
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mutex_lock(&dev->mutex);
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spin_lock(&w1_flock);
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f = w1_family_registered(rn->family);
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