From e76785d092ab8356d24996754f0ff1917021fcb6 Mon Sep 17 00:00:00 2001
From: Stefan Potyra <Stefan.Potyra@elektrobit.com>
Date: Tue, 24 Apr 2018 18:03:47 +0200
Subject: [PATCH] sc16is7xx: Check for an error when the clock is enabled.
Git-commit: e76785d092ab8356d24996754f0ff1917021fcb6
Patch-mainline: v4.18-rc1
References: bsc#1051510
When the clock is enabled, check if there is an error. Otherwise
clk_get_rate() can be called without enabled clock.
Found by Linux Driver Verification project (linuxtesting.org).
Fixes: 0814e8d5da2b ("sc16is7xx: enable the clock")
Signed-off-by: Stefan Potyra <Stefan.Potyra@elektrobit.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/tty/serial/sc16is7xx.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c
index 65792a3539d0..243c96025053 100644
--- a/drivers/tty/serial/sc16is7xx.c
+++ b/drivers/tty/serial/sc16is7xx.c
@@ -1168,7 +1168,10 @@ static int sc16is7xx_probe(struct device *dev,
else
return PTR_ERR(s->clk);
} else {
- clk_prepare_enable(s->clk);
+ ret = clk_prepare_enable(s->clk);
+ if (ret)
+ return ret;
+
freq = clk_get_rate(s->clk);
}
--
2.18.0