[PATCH 3.2 39/61] MIPS: BCM63XX: allow NULL clock for clk_get_rate

From: Ben Hutchings
Date: Tue Nov 21 2017 - 22:01:37 EST

3.2.96-rc1 review patch. If anyone has any objections, please let me know.


From: Jonas Gorski <jonas.gorski@xxxxxxxxx>

commit 1b495faec231980b6c719994b24044ccc04ae06c upstream.

Make the behaviour of clk_get_rate consistent with common clk's
clk_get_rate by accepting NULL clocks as parameter. Some device
drivers rely on this, and will cause an OOPS otherwise.

Fixes: e7300d04bd08 ("MIPS: BCM63xx: Add support for the Broadcom BCM63xx family of SOCs.")
Reported-by: Mathias Kresin <dev@xxxxxxxxx>
Signed-off-by: Jonas Gorski <jonas.gorski@xxxxxxxxx>
Reviewed-by: Florian Fainelli <f.fainelli@xxxxxxxxx>
Cc: bcm-kernel-feedback-list@xxxxxxxxxxxx
Cc: James Hogan <james.hogan@xxxxxxxxxx>
Cc: linux-mips@xxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Patchwork: https://patchwork.linux-mips.org/patch/16776/
Signed-off-by: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
arch/mips/bcm63xx/clk.c | 3 +++
1 file changed, 3 insertions(+)

--- a/arch/mips/bcm63xx/clk.c
+++ b/arch/mips/bcm63xx/clk.c
@@ -193,6 +193,9 @@ EXPORT_SYMBOL(clk_disable);

unsigned long clk_get_rate(struct clk *clk)
+ if (!clk)
+ return 0;
return clk->rate;