[PATCH 3.2 38/61] MIPS: AR7: allow NULL clock for clk_get_rate

[Ben Hutchings]

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

------------------

From: Jonas Gorski <jonas.gorski@xxxxxxxxx>

commit 585e0e9d02a690c29932b2fc0789835c7b91d448 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: 780019ddf02f ("MIPS: AR7: Implement clock API")
Signed-off-by: Jonas Gorski <jonas.gorski@xxxxxxxxx>
Reported-by: Mathias Kresin <dev@xxxxxxxxx>
Cc: Paul Gortmaker <paul.gortmaker@xxxxxxxxxxxxx>
Cc: James Hogan <james.hogan@xxxxxxxxxx>
Cc: linux-mips@xxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Patchwork: https://patchwork.linux-mips.org/patch/16775/
Signed-off-by: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
 arch/mips/ar7/clock.c | 3 +++
 1 file changed, 3 insertions(+)

--- a/arch/mips/ar7/clock.c
+++ b/arch/mips/ar7/clock.c
@@ -430,6 +430,9 @@ EXPORT_SYMBOL(clk_disable);
 
 unsigned long clk_get_rate(struct clk *clk)
 {
+	if (!clk)
+		return 0;
+
 	return clk->rate;
 }
 EXPORT_SYMBOL(clk_get_rate);