This is a note to let you know that I've just added the patch titled
w1 - call request_module with w1 master mutex unlocked
to my char-misc git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git
in the char-misc-linus branch.
The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)
The patch will hopefully also be merged in Linus's tree for the
next -rc kernel release.
If you have any questions about this process, please let me know.
>From bc04d76d6942068f75c10790072280b847ec6f1f Mon Sep 17 00:00:00 2001
From: Hans-Frieder Vogt <hfvogt@xxxxxxx>
Date: Sun, 6 Oct 2013 21:13:40 +0200
Subject: 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@xxxxxxx>
Acked-by: Evgeniy Polyakov <zbr@xxxxxxxxxxx>
Cc: stable <stable@xxxxxxxxxxxxxxx> # 3.11+
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/w1/w1.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/w1/w1.c b/drivers/w1/w1.c
index 0781217..fa932c2 100644
--- a/drivers/w1/w1.c
+++ b/drivers/w1/w1.c
@@ -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);
--
1.8.4.6.g82e253f.dirty
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