linux-kernel - [PATCH 5.10 38/80] clk: bcm: rpi: Fix error handling of raspberrypi_fw_get

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Message-Id: <20220906132818.585072990@linuxfoundation.org>
Date:   Tue,  6 Sep 2022 15:30:35 +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, Stefan Wahren <stefan.wahren@...e.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.10 38/80] clk: bcm: rpi: Fix error handling of raspberrypi_fw_get_rate

From: Stefan Wahren <stefan.wahren@...e.com>

[ Upstream commit 35f73cca1cecda0c1f8bb7d8be4ce5cd2d46ae8c ]

The function raspberrypi_fw_get_rate (e.g. used for the recalc_rate
hook) can fail to get the clock rate from the firmware. In this case
we cannot return a signed error value, which would be casted to
unsigned long. Fix this by returning 0 instead.

Signed-off-by: Stefan Wahren <stefan.wahren@...e.com>
Link: https://lore.kernel.org/r/20220625083643.4012-1-stefan.wahren@i2se.com
Fixes: 4e85e535e6cc ("clk: bcm283x: add driver interfacing with Raspberry Pi's firmware")
Acked-by: Florian Fainelli <f.fainelli@...il.com>
Signed-off-by: Stephen Boyd <sboyd@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/clk/bcm/clk-raspberrypi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clk/bcm/clk-raspberrypi.c b/drivers/clk/bcm/clk-raspberrypi.c
index f89b9cfc43099..2c12bd5ac1388 100644
--- a/drivers/clk/bcm/clk-raspberrypi.c
+++ b/drivers/clk/bcm/clk-raspberrypi.c
@@ -139,7 +139,7 @@ static unsigned long raspberrypi_fw_get_rate(struct clk_hw *hw,
 	ret = raspberrypi_clock_property(rpi->firmware, data,
 					 RPI_FIRMWARE_GET_CLOCK_RATE, &val);
 	if (ret)
-		return ret;
+		return 0;
 
 	return val;
 }
-- 
2.35.1