MIPS: BCM63xx: Add check for NULL for clk in clk_enable

[ Upstream commit ee9ef11bd2a59c2fefaa0959e5efcdf040d7c654 ]

Check clk for NULL before calling clk_enable_unlocked where clk
is dereferenced. There is such check in other implementations
of clk_enable.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: 6c22f5913d59 ("MIPS: BCM63xx: Add support for the Broadcom BCM63xx family of SOCs.")
Signed-off-by: Anastasia Belova <abelova@astralinux.ru>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/arch/mips/bcm63xx/clk.c b/arch/mips/bcm63xx/clk.c
index dcfa0ea912fe1633a10d0acbb87fe1cb85612ee4..f183c45503ce13f96a4b5a993029480451b97006 100644 (file)
--- a/arch/mips/bcm63xx/clk.c
+++ b/arch/mips/bcm63xx/clk.c
@@ -361,6 +361,8 @@ static struct clk clk_periph = {
  */
 int clk_enable(struct clk *clk)
 {
+       if (!clk)
+               return 0;
        mutex_lock(&clocks_mutex);
        clk_enable_unlocked(clk);
        mutex_unlock(&clocks_mutex);