linux-kernel - [PATCH] spi: zynqmp-gqspi: fix clock imbalance on probe failure

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20230622082435.7873-1-johan+linaro@kernel.org>
Date:   Thu, 22 Jun 2023 10:24:35 +0200
From:   Johan Hovold <johan+linaro@...nel.org>
To:     Mark Brown <broonie@...nel.org>
Cc:     Michal Simek <michal.simek@....com>, linux-spi@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Johan Hovold <johan+linaro@...nel.org>, stable@...r.kernel.org,
        Naga Sureshkumar Relli <naga.sureshkumar.relli@...inx.com>,
        Shubhrajyoti Datta <shubhrajyoti.datta@...inx.com>
Subject: [PATCH] spi: zynqmp-gqspi: fix clock imbalance on probe failure

Make sure that the device is not runtime suspended before explicitly
disabling the clocks on probe failure and on driver unbind to avoid a
clock enable-count imbalance.

Fixes: 9e3a000362ae ("spi: zynqmp: Add pm runtime support")
Cc: stable@...r.kernel.org	# 4.19
Cc: Naga Sureshkumar Relli <naga.sureshkumar.relli@...inx.com>
Cc: Shubhrajyoti Datta <shubhrajyoti.datta@...inx.com>
Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
---
 drivers/spi/spi-zynqmp-gqspi.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/spi/spi-zynqmp-gqspi.c b/drivers/spi/spi-zynqmp-gqspi.c
index fb2ca9b90eab..c309dedfd602 100644
--- a/drivers/spi/spi-zynqmp-gqspi.c
+++ b/drivers/spi/spi-zynqmp-gqspi.c
@@ -1342,9 +1342,9 @@ static int zynqmp_qspi_probe(struct platform_device *pdev)
 	return 0;
 
 clk_dis_all:
-	pm_runtime_put_sync(&pdev->dev);
-	pm_runtime_set_suspended(&pdev->dev);
 	pm_runtime_disable(&pdev->dev);
+	pm_runtime_put_noidle(&pdev->dev);
+	pm_runtime_set_suspended(&pdev->dev);
 	clk_disable_unprepare(xqspi->refclk);
 clk_dis_pclk:
 	clk_disable_unprepare(xqspi->pclk);
@@ -1368,11 +1368,15 @@ static void zynqmp_qspi_remove(struct platform_device *pdev)
 {
 	struct zynqmp_qspi *xqspi = platform_get_drvdata(pdev);
 
+	pm_runtime_get_sync(&pdev->dev);
+
 	zynqmp_gqspi_write(xqspi, GQSPI_EN_OFST, 0x0);
+
+	pm_runtime_disable(&pdev->dev);
+	pm_runtime_put_noidle(&pdev->dev);
+	pm_runtime_set_suspended(&pdev->dev);
 	clk_disable_unprepare(xqspi->refclk);
 	clk_disable_unprepare(xqspi->pclk);
-	pm_runtime_set_suspended(&pdev->dev);
-	pm_runtime_disable(&pdev->dev);
 }
 
 MODULE_DEVICE_TABLE(of, zynqmp_qspi_of_match);
-- 
2.39.3