From: Arnd Bergmann <arnd@arndb.de> To: "Emilio López" <emilio@elopez.com.ar>, "Michael Turquette" <mturquette@baylibre.com>, "Stephen Boyd" <sboyd@codeaurora.org>, "Maxime Ripard" <maxime.ripard@free-electrons.com>, "Chen-Yu Tsai" <wens@csie.org> Cc: Arnd Bergmann <arnd@arndb.de>, linux-clk@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH] clk: sunxi: fix uninitialized access Date: Wed, 23 Aug 2017 16:39:27 +0200 [thread overview] Message-ID: <20170823143937.2176025-1-arnd@arndb.de> (raw) gcc-8 reports an uninitialized variable access in a code path that we would see with incorrect DTB input: drivers/clk/sunxi/clk-sun8i-bus-gates.c: In function 'sun8i_h3_bus_gates_init': drivers/clk/sunxi/clk-sun8i-bus-gates.c:85:27: error: 'clk_parent' may be used uninitialized in this function [-Werror=maybe-uninitialized] This works around by skipping invalid input and printing a warning instead if it ever happens. The problem was apparently part of the initiali driver submission, but older compilers don't notice it. Fixes: ab6e23a4e388 ("clk: sunxi: Add H3 clocks support") Signed-off-by: Arnd Bergmann <arnd@arndb.de> --- drivers/clk/sunxi/clk-sun8i-bus-gates.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/clk/sunxi/clk-sun8i-bus-gates.c b/drivers/clk/sunxi/clk-sun8i-bus-gates.c index 63fdb790df29..bee305bdddbe 100644 --- a/drivers/clk/sunxi/clk-sun8i-bus-gates.c +++ b/drivers/clk/sunxi/clk-sun8i-bus-gates.c @@ -78,6 +78,10 @@ static void __init sun8i_h3_bus_gates_init(struct device_node *node) clk_parent = APB1; else if (index >= 96 && index <= 127) clk_parent = APB2; + else { + WARN_ON(true); + continue; + } clk_reg = reg + 4 * (index / 32); clk_bit = index % 32; -- 2.9.0
WARNING: multiple messages have this Message-ID (diff)
From: arnd@arndb.de (Arnd Bergmann) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH] clk: sunxi: fix uninitialized access Date: Wed, 23 Aug 2017 16:39:27 +0200 [thread overview] Message-ID: <20170823143937.2176025-1-arnd@arndb.de> (raw) gcc-8 reports an uninitialized variable access in a code path that we would see with incorrect DTB input: drivers/clk/sunxi/clk-sun8i-bus-gates.c: In function 'sun8i_h3_bus_gates_init': drivers/clk/sunxi/clk-sun8i-bus-gates.c:85:27: error: 'clk_parent' may be used uninitialized in this function [-Werror=maybe-uninitialized] This works around by skipping invalid input and printing a warning instead if it ever happens. The problem was apparently part of the initiali driver submission, but older compilers don't notice it. Fixes: ab6e23a4e388 ("clk: sunxi: Add H3 clocks support") Signed-off-by: Arnd Bergmann <arnd@arndb.de> --- drivers/clk/sunxi/clk-sun8i-bus-gates.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/clk/sunxi/clk-sun8i-bus-gates.c b/drivers/clk/sunxi/clk-sun8i-bus-gates.c index 63fdb790df29..bee305bdddbe 100644 --- a/drivers/clk/sunxi/clk-sun8i-bus-gates.c +++ b/drivers/clk/sunxi/clk-sun8i-bus-gates.c @@ -78,6 +78,10 @@ static void __init sun8i_h3_bus_gates_init(struct device_node *node) clk_parent = APB1; else if (index >= 96 && index <= 127) clk_parent = APB2; + else { + WARN_ON(true); + continue; + } clk_reg = reg + 4 * (index / 32); clk_bit = index % 32; -- 2.9.0
next reply other threads:[~2017-08-23 14:40 UTC|newest] Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-08-23 14:39 Arnd Bergmann [this message] 2017-08-23 14:39 ` [PATCH] clk: sunxi: fix uninitialized access Arnd Bergmann 2017-08-24 8:50 ` Maxime Ripard 2017-08-24 8:50 ` Maxime Ripard 2017-08-31 17:56 ` Stephen Boyd 2017-08-31 17:56 ` Stephen Boyd
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