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authorGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-10-19 13:02:47 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-10-19 13:02:47 -0700
commitdfc568e6bc08916f1035af456e4631c47166b5cf (patch)
tree3c96bdc26687e0f6958e790c8c93c0c6efb6b8d6 /drivers/w1
parentfdf91dae6f024c6dfee425fe754df6b1957f6c53 (diff)
parent31d141e3a666269a3b6fcccddb0351caf7454240 (diff)
downloadblackbird-op-linux-dfc568e6bc08916f1035af456e4631c47166b5cf.tar.gz
blackbird-op-linux-dfc568e6bc08916f1035af456e4631c47166b5cf.zip
Merge 3.12-rc6 into char-misc-next
We want the fixes in here as well. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/w1')
-rw-r--r--drivers/w1/w1.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/w1/w1.c b/drivers/w1/w1.c
index c7c64f18773d..fa932c2f7d97 100644
--- a/drivers/w1/w1.c
+++ b/drivers/w1/w1.c
@@ -613,6 +613,9 @@ static int w1_bus_notify(struct notifier_block *nb, unsigned long action,
sl = dev_to_w1_slave(dev);
fops = sl->family->fops;
+ if (!fops)
+ return 0;
+
switch (action) {
case BUS_NOTIFY_ADD_DEVICE:
/* if the family driver needs to initialize something... */
@@ -713,7 +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);
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