From 4dd1ef5fc579ba0952560c4d17fc6ad1929f90c8 Mon Sep 17 00:00:00 2001 From: Lukas Wunner Date: Thu, 7 Jan 2021 07:47:29 +0000 Subject: [PATCH] spi: mt7621: Don't leak SPI master in probe error path stable inclusion from stable-5.10.4 commit 671ad53ff3d517c33a9f76ecff084abddb858eb5 bugzilla: 46903 -------------------------------- commit 46b5c4fb87ce8211e0f9b0383dbde72c3652d2ba upstream. If the calls to device_reset() or devm_spi_register_controller() fail on probe of the MediaTek MT7621 SPI driver, the spi_controller struct is erroneously not freed. Fix by switching over to the new devm_spi_alloc_master() helper. Additionally, there's an ordering issue in mt7621_spi_remove() wherein the spi_controller is unregistered after disabling the SYS clock. The correct order is to call spi_unregister_controller() *before* this teardown step because bus accesses may still be ongoing until that function returns. All of these bugs have existed since the driver was first introduced, so it seems fair to fix them together in a single commit. Fixes: 1ab7f2a43558 ("staging: mt7621-spi: add mt7621 support") Signed-off-by: Lukas Wunner Reviewed-by: Stefan Roese Cc: # v4.17+: 5e844cc37a5c: spi: Introduce device-managed SPI controller allocation Cc: # v4.17+ Link: https://lore.kernel.org/r/72b680796149f5fcda0b3f530ffb7ee73b04f224.1607286887.git.lukas@wunner.de Signed-off-by: Mark Brown Signed-off-by: Greg Kroah-Hartman Signed-off-by: Chen Jun Acked-by: Xie XiuQi --- drivers/spi/spi-mt7621.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/spi/spi-mt7621.c b/drivers/spi/spi-mt7621.c index e227700808cb..b4b9b7309b5e 100644 --- a/drivers/spi/spi-mt7621.c +++ b/drivers/spi/spi-mt7621.c @@ -350,7 +350,7 @@ static int mt7621_spi_probe(struct platform_device *pdev) if (status) return status; - master = spi_alloc_master(&pdev->dev, sizeof(*rs)); + master = devm_spi_alloc_master(&pdev->dev, sizeof(*rs)); if (!master) { dev_info(&pdev->dev, "master allocation failed\n"); clk_disable_unprepare(clk); @@ -382,7 +382,7 @@ static int mt7621_spi_probe(struct platform_device *pdev) return ret; } - ret = devm_spi_register_controller(&pdev->dev, master); + ret = spi_register_controller(master); if (ret) clk_disable_unprepare(clk); @@ -397,6 +397,7 @@ static int mt7621_spi_remove(struct platform_device *pdev) master = dev_get_drvdata(&pdev->dev); rs = spi_controller_get_devdata(master); + spi_unregister_controller(master); clk_disable_unprepare(rs->clk); return 0; -- GitLab