From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>,
Nicolas Ferre <nicolas.ferre@microchip.com>,
Ludovic Desroches <ludovic.desroches@microchip.com>,
Stephen Boyd <sboyd@kernel.org>, Sasha Levin <sashal@kernel.org>,
linux-clk@vger.kernel.org
Subject: [PATCH AUTOSEL 5.2 03/59] clk: at91: generated: Truncate divisor to GENERATED_MAX_DIV + 1
Date: Tue, 6 Aug 2019 17:32:23 -0400 [thread overview]
Message-ID: <20190806213319.19203-3-sashal@kernel.org> (raw)
In-Reply-To: <20190806213319.19203-1-sashal@kernel.org>
From: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
[ Upstream commit 1573eebeaa8055777eb753f9b4d1cbe653380c38 ]
In clk_generated_determine_rate(), if the divisor is greater than
GENERATED_MAX_DIV + 1, then the wrong best_rate will be returned.
If clk_generated_set_rate() will be called later with this wrong
rate, it will return -EINVAL, so the generated clock won't change
its value. Do no let the divisor be greater than GENERATED_MAX_DIV + 1.
Fixes: 8c7aa6328947 ("clk: at91: clk-generated: remove useless divisor loop")
Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Acked-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/clk/at91/clk-generated.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/clk/at91/clk-generated.c b/drivers/clk/at91/clk-generated.c
index 44db83a6d01c2..44a46dcc0518b 100644
--- a/drivers/clk/at91/clk-generated.c
+++ b/drivers/clk/at91/clk-generated.c
@@ -141,6 +141,8 @@ static int clk_generated_determine_rate(struct clk_hw *hw,
continue;
div = DIV_ROUND_CLOSEST(parent_rate, req->rate);
+ if (div > GENERATED_MAX_DIV + 1)
+ div = GENERATED_MAX_DIV + 1;
clk_generated_best_diff(req, parent, parent_rate, div,
&best_diff, &best_rate);
--
2.20.1
next parent reply other threads:[~2019-08-06 21:33 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20190806213319.19203-1-sashal@kernel.org>
2019-08-06 21:32 ` Sasha Levin [this message]
2019-08-06 21:32 ` [PATCH AUTOSEL 5.2 04/59] clk: sprd: Select REGMAP_MMIO to avoid compile errors Sasha Levin
2019-08-06 21:32 ` [PATCH AUTOSEL 5.2 05/59] clk: renesas: cpg-mssr: Fix reset control race condition Sasha Levin
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