From 10cdfe54dab034311c8e2fad9ba2dffbe616caa9 Mon Sep 17 00:00:00 2001 From: Tomeu Vizoso Date: Tue, 2 Dec 2014 08:54:19 +0100 Subject: clk: Don't try to use a struct clk* after it could have been freed As __clk_release could call kfree on clk and then we wouldn't have a safe way of getting the module that owns the clock. Signed-off-by: Tomeu Vizoso Fixes: fcb0ee6a3d33 ("clk: Implement clk_unregister") Reviewed-by: Stephen Boyd Signed-off-by: Michael Turquette --- drivers/clk/clk.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) (limited to 'drivers/clk') diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c index 42f940ff5edf..609e9db1a69a 100644 --- a/drivers/clk/clk.c +++ b/drivers/clk/clk.c @@ -2268,14 +2268,17 @@ int __clk_get(struct clk *clk) void __clk_put(struct clk *clk) { + struct module *owner; + if (!clk || WARN_ON_ONCE(IS_ERR(clk))) return; clk_prepare_lock(); + owner = clk->owner; kref_put(&clk->ref, __clk_release); clk_prepare_unlock(); - module_put(clk->owner); + module_put(owner); } /*** clk rate change notifiers ***/ -- cgit v1.2.3