[PATCH 3.10 22/26] pinctrl: protect pinctrl_list add

From: Greg Kroah-Hartman
Date: Tue Feb 18 2014 - 18:23:53 EST


3.10-stable review patch. If anyone has any objections, please let me know.

------------------

From: Stanislaw Gruszka <sgruszka@xxxxxxxxxx>

commit 7b320cb1ed2dbd2c5f2a778197baf76fd6bf545a upstream.

We have few fedora bug reports about list corruption on pinctrl,
for example:
https://bugzilla.redhat.com/show_bug.cgi?id=1051918

Most likely corruption happen due lack of protection of pinctrl_list
when adding new nodes to it. Patch corrects that.

Fixes: 42fed7ba44e ("pinctrl: move subsystem mutex to pinctrl_dev struct")
Signed-off-by: Stanislaw Gruszka <sgruszka@xxxxxxxxxx>
Acked-by: Stephen Warren <swarren@xxxxxxxxxx>
Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
drivers/pinctrl/core.c | 2 ++
1 file changed, 2 insertions(+)

--- a/drivers/pinctrl/core.c
+++ b/drivers/pinctrl/core.c
@@ -807,7 +807,9 @@ static struct pinctrl *create_pinctrl(st
kref_init(&p->users);

/* Add the pinctrl handle to the global list */
+ mutex_lock(&pinctrl_list_mutex);
list_add_tail(&p->node, &pinctrl_list);
+ mutex_unlock(&pinctrl_list_mutex);

return p;
}


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