| Message ID | 20201201093143.113180-1-miaoqinglang@huawei.com |
|---|---|
| State | Accepted |
| Commit | 780f629741257ed6c54bd3eb53b57f648eabf200 |
| Headers | show |
| Series | i2c: fix reference leak when pm_runtime_get_sync fails | expand |
On 12/1/20 3:01 PM, Qinglang Miao wrote: > The PM reference count is not expected to be incremented on > return in omap_i2c_probe() and omap_i2c_remove(). > > However, pm_runtime_get_sync will increment the PM reference > count even failed. Forgetting to putting operation will result > in a reference leak here. I Replace it with pm_runtime_resume_and_get > to keep usage counter balanced. > > What's more, error path 'err_free_mem' seems not like a proper > name any more. So I change the name to err_disable_pm and move > pm_runtime_disable below, for pm_runtime of 'pdev->dev' should > be disabled when pm_runtime_resume_and_get fails. > > Fixes: 3b0fb97c8dc4 ("I2C: OMAP: Handle error check for pm runtime") > Reported-by: Hulk Robot <hulkci@huawei.com> > Signed-off-by: Qinglang Miao <miaoqinglang@huawei.com> > --- Reviewed-by: Vignesh Raghavendra <vigneshr@ti.com> > drivers/i2c/busses/i2c-omap.c | 8 ++++---- > 1 file changed, 4 insertions(+), 4 deletions(-) > > diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c > index 12ac4212a..d4f6c6d60 100644 > --- a/drivers/i2c/busses/i2c-omap.c > +++ b/drivers/i2c/busses/i2c-omap.c > @@ -1404,9 +1404,9 @@ omap_i2c_probe(struct platform_device *pdev) > pm_runtime_set_autosuspend_delay(omap->dev, OMAP_I2C_PM_TIMEOUT); > pm_runtime_use_autosuspend(omap->dev); > > - r = pm_runtime_get_sync(omap->dev); > + r = pm_runtime_resume_and_get(omap->dev); > if (r < 0) > - goto err_free_mem; > + goto err_disable_pm; > > /* > * Read the Rev hi bit-[15:14] ie scheme this is 1 indicates ver2. > @@ -1513,8 +1513,8 @@ omap_i2c_probe(struct platform_device *pdev) > omap_i2c_write_reg(omap, OMAP_I2C_CON_REG, 0); > pm_runtime_dont_use_autosuspend(omap->dev); > pm_runtime_put_sync(omap->dev); > +err_disable_pm: > pm_runtime_disable(&pdev->dev); > -err_free_mem: > > return r; > } > @@ -1525,7 +1525,7 @@ static int omap_i2c_remove(struct platform_device *pdev) > int ret; > > i2c_del_adapter(&omap->adapter); > - ret = pm_runtime_get_sync(&pdev->dev); > + ret = pm_runtime_resume_and_get(&pdev->dev); > if (ret < 0) > return ret; > >
diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c index 12ac4212a..d4f6c6d60 100644 --- a/drivers/i2c/busses/i2c-omap.c +++ b/drivers/i2c/busses/i2c-omap.c @@ -1404,9 +1404,9 @@ omap_i2c_probe(struct platform_device *pdev) pm_runtime_set_autosuspend_delay(omap->dev, OMAP_I2C_PM_TIMEOUT); pm_runtime_use_autosuspend(omap->dev); - r = pm_runtime_get_sync(omap->dev); + r = pm_runtime_resume_and_get(omap->dev); if (r < 0) - goto err_free_mem; + goto err_disable_pm; /* * Read the Rev hi bit-[15:14] ie scheme this is 1 indicates ver2. @@ -1513,8 +1513,8 @@ omap_i2c_probe(struct platform_device *pdev) omap_i2c_write_reg(omap, OMAP_I2C_CON_REG, 0); pm_runtime_dont_use_autosuspend(omap->dev); pm_runtime_put_sync(omap->dev); +err_disable_pm: pm_runtime_disable(&pdev->dev); -err_free_mem: return r; } @@ -1525,7 +1525,7 @@ static int omap_i2c_remove(struct platform_device *pdev) int ret; i2c_del_adapter(&omap->adapter); - ret = pm_runtime_get_sync(&pdev->dev); + ret = pm_runtime_resume_and_get(&pdev->dev); if (ret < 0) return ret;
The PM reference count is not expected to be incremented on return in omap_i2c_probe() and omap_i2c_remove(). However, pm_runtime_get_sync will increment the PM reference count even failed. Forgetting to putting operation will result in a reference leak here. I Replace it with pm_runtime_resume_and_get to keep usage counter balanced. What's more, error path 'err_free_mem' seems not like a proper name any more. So I change the name to err_disable_pm and move pm_runtime_disable below, for pm_runtime of 'pdev->dev' should be disabled when pm_runtime_resume_and_get fails. Fixes: 3b0fb97c8dc4 ("I2C: OMAP: Handle error check for pm runtime") Reported-by: Hulk Robot <hulkci@huawei.com> Signed-off-by: Qinglang Miao <miaoqinglang@huawei.com> --- drivers/i2c/busses/i2c-omap.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)