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sc16is7xx: Check for an error when the clock is enabled. 

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: 0814e8d5da ("sc16is7xx: enable the clock")
Signed-off-by: Stefan Potyra <Stefan.Potyra@elektrobit.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Stefan Potyra 2018-04-24 18:03:47 +02:00 committed by Greg Kroah-Hartman
parent 2468b3e4aa
commit e76785d092
1 changed files with 4 additions and 1 deletions
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5
drivers/tty/serial/sc16is7xx.c
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@ -1168,7 +1168,10 @@ static int sc16is7xx_probe(struct device *dev,
else else
return PTR_ERR(s->clk); return PTR_ERR(s->clk);
} else { } else {
clk_prepare_enable(s->clk); ret = clk_prepare_enable(s->clk);
if (ret)
return ret;
freq = clk_get_rate(s->clk); freq = clk_get_rate(s->clk);
} }