linux-kernel - [PATCH] clk: rockchip: Initialize hw to error to avoid undefined behavior

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Message-Id: <20200924004441.1476015-1-sboyd@kernel.org>
Date:   Wed, 23 Sep 2020 17:44:41 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
        Elaine Zhang <zhangqing@...k-chips.com>,
        Heiko Stuebner <heiko@...ech.de>
Subject: [PATCH] clk: rockchip: Initialize hw to error to avoid undefined behavior

We can get down to this return value from ERR_CAST() without
initializing hw. Set it to -ENOMEM so that we always return something
sane.

Fixes the following smatch warning:

drivers/clk/rockchip/clk-half-divider.c:228 rockchip_clk_register_halfdiv() error: uninitialized symbol 'hw'.
drivers/clk/rockchip/clk-half-divider.c:228 rockchip_clk_register_halfdiv() warn: passing zero to 'ERR_CAST'

Cc: Elaine Zhang <zhangqing@...k-chips.com>
Cc: Heiko Stuebner <heiko@...ech.de>
Fixes: 956060a52795 ("clk: rockchip: add support for half divider")
Signed-off-by: Stephen Boyd <sboyd@...nel.org>
---
 drivers/clk/rockchip/clk-half-divider.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clk/rockchip/clk-half-divider.c b/drivers/clk/rockchip/clk-half-divider.c
index e97fd3dfbae7..ccd5c270c213 100644
--- a/drivers/clk/rockchip/clk-half-divider.c
+++ b/drivers/clk/rockchip/clk-half-divider.c
@@ -166,7 +166,7 @@ struct clk *rockchip_clk_register_halfdiv(const char *name,
 					  unsigned long flags,
 					  spinlock_t *lock)
 {
-	struct clk_hw *hw;
+	struct clk_hw *hw = ERR_PTR(-ENOMEM);
 	struct clk_mux *mux = NULL;
 	struct clk_gate *gate = NULL;
 	struct clk_divider *div = NULL;

base-commit: ca52a47af60f791b08a540a8e14d8f5751ee63e9
-- 
https://git.kernel.org/pub/scm/linux/kernel/git/clk/linux.git/