From 044ea131919f137c626cf50843d488e7ebfd3e43 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= Date: Mon, 15 Nov 2021 19:44:28 +0800 Subject: [PATCH] hwmon: (ltc2947) Properly handle errors when looking for the external clock MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit stable inclusion from stable-5.10.74 commit 3d68c7b0ab5b5b9fd7a2a8b13114ac0336e23a30 bugzilla: 182986 https://gitee.com/openeuler/kernel/issues/I4I3MG Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=3d68c7b0ab5b5b9fd7a2a8b13114ac0336e23a30 -------------------------------- [ Upstream commit 6f7d70467121f790b36af2d84bc02b5c236bf5e6 ] The return value of devm_clk_get should in general be propagated to upper layer. In this case the clk is optional, use the appropriate wrapper instead of interpreting all errors as "The optional clk is not available". Signed-off-by: Uwe Kleine-König Link: https://lore.kernel.org/r/20210923201113.398932-1-u.kleine-koenig@pengutronix.de Signed-off-by: Guenter Roeck Signed-off-by: Sasha Levin Signed-off-by: Chen Jun Reviewed-by: Weilong Chen Acked-by: Weilong Chen Signed-off-by: Chen Jun Signed-off-by: Zheng Zengkai --- drivers/hwmon/ltc2947-core.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/hwmon/ltc2947-core.c b/drivers/hwmon/ltc2947-core.c index bb3f7749a0b0..5423466de697 100644 --- a/drivers/hwmon/ltc2947-core.c +++ b/drivers/hwmon/ltc2947-core.c @@ -989,8 +989,12 @@ static int ltc2947_setup(struct ltc2947_data *st) return ret; /* check external clock presence */ - extclk = devm_clk_get(st->dev, NULL); - if (!IS_ERR(extclk)) { + extclk = devm_clk_get_optional(st->dev, NULL); + if (IS_ERR(extclk)) + return dev_err_probe(st->dev, PTR_ERR(extclk), + "Failed to get external clock\n"); + + if (extclk) { unsigned long rate_hz; u8 pre = 0, div, tbctl; u64 aux; -- GitLab