[PATCH v3] MIPS: BCM63xx: Add check for NULL for clk in clk_enable

[Anastasia Belova]

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: e7300d04bd08 ("MIPS: BCM63xx: Add support for the Broadcom BCM63xx family of SOCs.")
Signed-off-by: Anastasia Belova <abelova@xxxxxxxxxxxxx>
---
v2: Fix errors reported by kernel test robot <lkp@xxxxxxxxx>.
v3: Merge several patches into single one.
 arch/mips/bcm63xx/clk.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/mips/bcm63xx/clk.c b/arch/mips/bcm63xx/clk.c
index 6e6756e8fa0a..86a6e2590866 100644
--- 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);
-- 
2.30.2