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| author |   Tobias Jordan <Tobias.Jordan@elektrobit.com> | 2018-04-30 16:49:29 +0200 |
|---|---|---|
| committer |   Wolfram Sang <wsa@the-dreams.de> | 2018-05-08 23:13:19 +0200 |
| commit | e6faa71034f6d0692a3a20d6b55565a36b6b8156 (patch) | |
| tree | d61e410156a52fb895a278ef422ca67887e0c284 /drivers/i2c/busses/i2c-axxia.c | |
| parent | i2c: rcar: enhance comment to avoid regressions (diff) | |
| download | linux-dev-e6faa71034f6d0692a3a20d6b55565a36b6b8156.tar.xz linux-dev-e6faa71034f6d0692a3a20d6b55565a36b6b8156.zip | |
i2c: axxia: enable clock before calling clk_get_rate()
axxia_i2c_init() uses clk_get_rate() for idev->i2c_clk. clk_get_rate()
should only be called if the clock is enabled, so ensure that by moving
the clk_prepare_enable() call before the call to axxia_i2c_init().
Found by Linux Driver Verification project (linuxtesting.org).
Fixes: 08678b850cd0 ("i2c: axxia: Add I2C driver for AXM55xx")
Signed-off-by: Tobias Jordan <Tobias.Jordan@elektrobit.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'drivers/i2c/busses/i2c-axxia.c')
| -rw-r--r-- | drivers/i2c/busses/i2c-axxia.c | 26 |
1 files changed, 14 insertions, 12 deletions
diff --git a/drivers/i2c/busses/i2c-axxia.c b/drivers/i2c/busses/i2c-axxia.c index 13f07482ec68..12f92369888b 100644 --- a/drivers/i2c/busses/i2c-axxia.c +++ b/drivers/i2c/busses/i2c-axxia.c @@ -532,23 +532,23 @@ static int axxia_i2c_probe(struct platform_device *pdev) if (idev->bus_clk_rate == 0) idev->bus_clk_rate = 100000; /* default clock rate */ + ret = clk_prepare_enable(idev->i2c_clk); + if (ret) { + dev_err(&pdev->dev, "failed to enable clock\n"); + return ret; + } + ret = axxia_i2c_init(idev); if (ret) { dev_err(&pdev->dev, "failed to initialize\n"); - return ret; + goto error_disable_clk; } ret = devm_request_irq(&pdev->dev, irq, axxia_i2c_isr, 0, pdev->name, idev); if (ret) { dev_err(&pdev->dev, "failed to claim IRQ%d\n", irq); - return ret; - } - - ret = clk_prepare_enable(idev->i2c_clk); - if (ret) { - dev_err(&pdev->dev, "failed to enable clock\n"); - return ret; + goto error_disable_clk; } i2c_set_adapdata(&idev->adapter, idev); @@ -563,12 +563,14 @@ static int axxia_i2c_probe(struct platform_device *pdev) platform_set_drvdata(pdev, idev); ret = i2c_add_adapter(&idev->adapter); - if (ret) { - clk_disable_unprepare(idev->i2c_clk); - return ret; - } + if (ret) + goto error_disable_clk; return 0; + +error_disable_clk: + clk_disable_unprepare(idev->i2c_clk); + return ret; } static int axxia_i2c_remove(struct platform_device *pdev) |