AcoSail/kernel_optimize_test
8
0
Fork 0
forked from luck/tmp_suning_uos_patched
Code Pull Requests Activity

i2c: imx: avoid taking clk_prepare mutex in PM callbacks

Browse Source 
This is unsafe, as the runtime PM callbacks are called from the PM
workqueue, so this may deadlock when handling an i2c attached clock,
which may already hold the clk_prepare mutex from another context.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Lucas Stach 2018-03-08 14:25:18 +01:00 committed by Wolfram Sang
parent 90ad2cbe88
commit d9a22d713a
1 changed files with 2 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/i2c/busses/i2c-imx.c
View File

@ -1226,7 +1226,7 @@ static int i2c_imx_runtime_suspend(struct device *dev)
{
struct imx_i2c_struct *i2c_imx = dev_get_drvdata(dev);
clk_disable_unprepare(i2c_imx->clk);
clk_disable(i2c_imx->clk);
return 0;
}
@ -1236,7 +1236,7 @@ static int i2c_imx_runtime_resume(struct device *dev)
struct imx_i2c_struct *i2c_imx = dev_get_drvdata(dev);
int ret;
ret = clk_prepare_enable(i2c_imx->clk);
ret = clk_enable(i2c_imx->clk);
if (ret)
dev_err(dev, "can't enable I2C clock, ret=%d\n", ret);