linux-kernel - [PATCH 2/2] clk: ti: dra7-atl: Provide error check for incoming parameters in set

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Message-ID: <1408381015-16042-3-git-send-email-nm@ti.com>
Date:	Mon, 18 Aug 2014 11:56:55 -0500
From:	Nishanth Menon <nm@...com>
To:	Tero Kristo <t-kristo@...com>,
	Mike Turquette <mturquette@...aro.org>
CC:	<linux-omap@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, Nishanth Menon <nm@...com>
Subject: [PATCH 2/2] clk: ti: dra7-atl: Provide error check for incoming parameters in set_rate

Check for valid parameters in check rate. Else, we end up getting
errors.

This occurs as part of the inital clock tree update of child clock
nodes where new_rate could be 0 for non functional clocks.

Fixes: 9ac33b0ce81fa48 (" CLK: TI: Driver for DRA7 ATL (Audio Tracking Logic)")
Signed-off-by: Nishanth Menon <nm@...com>
---
 drivers/clk/ti/clk-dra7-atl.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/ti/clk-dra7-atl.c b/drivers/clk/ti/clk-dra7-atl.c
index 4a65b41..af29359 100644
--- a/drivers/clk/ti/clk-dra7-atl.c
+++ b/drivers/clk/ti/clk-dra7-atl.c
@@ -139,9 +139,13 @@ static long atl_clk_round_rate(struct clk_hw *hw, unsigned long rate,
 static int atl_clk_set_rate(struct clk_hw *hw, unsigned long rate,
 			    unsigned long parent_rate)
 {
-	struct dra7_atl_desc *cdesc = to_atl_desc(hw);
+	struct dra7_atl_desc *cdesc;
 	u32 divider;
 
+	if (!hw || !rate)
+		return -EINVAL;
+
+	cdesc = to_atl_desc(hw);
 	divider = ((parent_rate + rate / 2) / rate) - 1;
 	if (divider > DRA7_ATL_DIVIDER_MASK)
 		divider = DRA7_ATL_DIVIDER_MASK;
-- 
1.7.9.5

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