linux-kernel - [PATCH 5.4 064/260] clk: at91: clk-generated: Limit the requested rate to our range

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Date:   Mon, 20 Sep 2021 18:41:22 +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,
        Codrin Ciubotariu <codrin.ciubotariu@...rochip.com>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 064/260] clk: at91: clk-generated: Limit the requested rate to our range

From: Codrin Ciubotariu <codrin.ciubotariu@...rochip.com>

[ Upstream commit af7651e67b9d5f7e63ea23b118e3672ac662244a ]

On clk_generated_determine_rate(), the requested rate could be outside
of clk's range. Limit the rate to the clock's range to not return an
error.

Fixes: df70aeef6083 ("clk: at91: add generated clock driver")
Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@...rochip.com>
Link: https://lore.kernel.org/r/20210707131213.3283509-1-codrin.ciubotariu@microchip.com
Acked-by: Nicolas Ferre <nicolas.ferre@...rochip.com>
Signed-off-by: Stephen Boyd <sboyd@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/clk/at91/clk-generated.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/clk/at91/clk-generated.c b/drivers/clk/at91/clk-generated.c
index 273d0447d727..d7fe1303f79d 100644
--- a/drivers/clk/at91/clk-generated.c
+++ b/drivers/clk/at91/clk-generated.c
@@ -127,6 +127,12 @@ static int clk_generated_determine_rate(struct clk_hw *hw,
 	int i;
 	u32 div;
 
+	/* do not look for a rate that is outside of our range */
+	if (gck->range.max && req->rate > gck->range.max)
+		req->rate = gck->range.max;
+	if (gck->range.min && req->rate < gck->range.min)
+		req->rate = gck->range.min;
+
 	for (i = 0; i < clk_hw_get_num_parents(hw); i++) {
 		if (gck->chg_pid == i)
 			continue;
-- 
2.30.2