linux-kernel - [PATCH 5.12 508/700] clk: si5341: Avoid divide errors due to bogus register contents

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Date:   Mon, 12 Jul 2021 08:09:51 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Robert Hancock <robert.hancock@...ian.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.12 508/700] clk: si5341: Avoid divide errors due to bogus register contents

From: Robert Hancock <robert.hancock@...ian.com>

[ Upstream commit 78f6f406026d688868223d5dbeb197a4f7e9a9fd ]

If the Si5341 is being initially programmed and has no stored NVM
configuration, some of the register contents may contain unexpected
values, such as zeros, which could cause divide by zero errors during
driver initialization. Trap errors caused by zero registers or zero clock
rates which could result in divide errors later in the code.

Fixes: 3044a860fd ("clk: Add Si5341/Si5340 driver")
Signed-off-by: Robert Hancock <robert.hancock@...ian.com>
Link: https://lore.kernel.org/r/20210325192643.2190069-4-robert.hancock@calian.com
Signed-off-by: Stephen Boyd <sboyd@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/clk/clk-si5341.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/clk-si5341.c b/drivers/clk/clk-si5341.c
index b8a960e927bc..ac1ccec2b681 100644
--- a/drivers/clk/clk-si5341.c
+++ b/drivers/clk/clk-si5341.c
@@ -624,6 +624,9 @@ static unsigned long si5341_synth_clk_recalc_rate(struct clk_hw *hw,
 			SI5341_SYNTH_N_NUM(synth->index), &n_num, &n_den);
 	if (err < 0)
 		return err;
+	/* Check for bogus/uninitialized settings */
+	if (!n_num || !n_den)
+		return 0;
 
 	/*
 	 * n_num and n_den are shifted left as much as possible, so to prevent
@@ -807,6 +810,9 @@ static long si5341_output_clk_round_rate(struct clk_hw *hw, unsigned long rate,
 {
 	unsigned long r;
 
+	if (!rate)
+		return 0;
+
 	r = *parent_rate >> 1;
 
 	/* If rate is an even divisor, no changes to parent required */
@@ -835,11 +841,16 @@ static int si5341_output_clk_set_rate(struct clk_hw *hw, unsigned long rate,
 		unsigned long parent_rate)
 {
 	struct clk_si5341_output *output = to_clk_si5341_output(hw);
-	/* Frequency divider is (r_div + 1) * 2 */
-	u32 r_div = (parent_rate / rate) >> 1;
+	u32 r_div;
 	int err;
 	u8 r[3];
 
+	if (!rate)
+		return -EINVAL;
+
+	/* Frequency divider is (r_div + 1) * 2 */
+	r_div = (parent_rate / rate) >> 1;
+
 	if (r_div <= 1)
 		r_div = 0;
 	else if (r_div >= BIT(24))
-- 
2.30.2