[PATCH 6.1 112/321] ssb: Fix division by zero issue in ssb_calc_clock_rate

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6.1-stable review patch.  If anyone has any objections, please let me know.

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

From: Rand Deeb <rand.sec96@xxxxxxxxx>

[ Upstream commit e0b5127fa134fe0284d58877b6b3133939c8b3ce ]

In ssb_calc_clock_rate(), there is a potential issue where the value of
m1 could be zero due to initialization using clkfactor_f6_resolv(). This
situation raised concerns about the possibility of a division by zero
error.

We fixed it by following the suggestions provided by Larry Finger
<Larry.Finger@xxxxxxxxxxxx> and Michael Büsch <m@xxxxxxx>. The fix
involves returning a value of 1 instead of 0 in clkfactor_f6_resolv().
This modification ensures the proper functioning of the code and
eliminates the risk of division by zero errors.

Signed-off-by: Rand Deeb <rand.sec96@xxxxxxxxx>
Acked-by: Larry Finger <Larry.Finger@xxxxxxxxxxxx>
Acked-by: Michael Büsch <m@xxxxxxx>
Signed-off-by: Kalle Valo <kvalo@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20230904232346.34991-1-rand.sec96@xxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/ssb/main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/ssb/main.c b/drivers/ssb/main.c
index 8a93c83cb6f80..d52e91258e989 100644
--- a/drivers/ssb/main.c
+++ b/drivers/ssb/main.c
@@ -837,7 +837,7 @@ static u32 clkfactor_f6_resolve(u32 v)
 	case SSB_CHIPCO_CLK_F6_7:
 		return 7;
 	}
-	return 0;
+	return 1;
 }
 
 /* Calculate the speed the backplane would run at a given set of clockcontrol values */
-- 
2.43.0







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