| Message ID | 20180504224427.32606-2-bjorn.andersson@linaro.org (mailing list archive) |
|---|---|
| State | Not Applicable, archived |
| Headers | show |
Hi, On 2018년 05월 05일 07:44, Bjorn Andersson wrote: > Failing to register with devfreq leaves hba->devfreq assigned, which > causes the error path to dereference the ERR_PTR(). Rather than bolting > on more conditionals, move the call of devm_devfreq_add_device() into > it's own function and only update hba->devfreq once it's successfully > registered. > > The subsequent patch builds upon this to make UFS actually work again, > as it's been broken since f1d981eaecf8 ("PM / devfreq: Use the available > min/max frequency") > > Reviewed-by: Subhash Jadavani <subhashj@codeaurora.org> > Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org> > --- > > Changes since v1: > - None > > drivers/scsi/ufs/ufshcd.c | 31 ++++++++++++++++++++++--------- > 1 file changed, 22 insertions(+), 9 deletions(-) > > diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c > index 8f22a980b1a7..2253f24309ec 100644 > --- a/drivers/scsi/ufs/ufshcd.c > +++ b/drivers/scsi/ufs/ufshcd.c > @@ -1255,6 +1255,26 @@ static struct devfreq_dev_profile ufs_devfreq_profile = { > .get_dev_status = ufshcd_devfreq_get_dev_status, > }; > > +static int ufshcd_devfreq_init(struct ufs_hba *hba) > +{ > + struct devfreq *devfreq; > + int ret; > + > + devfreq = devm_devfreq_add_device(hba->dev, > + &ufs_devfreq_profile, > + "simple_ondemand", You better to use 'DEVFREQ_GOV_SIMPLE_ONDEMAND' definition in include/linux/devfreq.h in order to prevent the some typo. - aa7c352f9841 ("PM / devfreq: Define the constant governor name") > + NULL); > + if (IS_ERR(devfreq)) { > + ret = PTR_ERR(devfreq); > + dev_err(hba->dev, "Unable to register with devfreq %d\n", ret); > + return ret; > + } > + > + hba->devfreq = devfreq; > + > + return 0; > +} > + > static void __ufshcd_suspend_clkscaling(struct ufs_hba *hba) > { > unsigned long flags; > @@ -6399,16 +6419,9 @@ static int ufshcd_probe_hba(struct ufs_hba *hba) > sizeof(struct ufs_pa_layer_attr)); > hba->clk_scaling.saved_pwr_info.is_valid = true; > if (!hba->devfreq) { > - hba->devfreq = devm_devfreq_add_device(hba->dev, > - &ufs_devfreq_profile, > - "simple_ondemand", > - NULL); > - if (IS_ERR(hba->devfreq)) { > - ret = PTR_ERR(hba->devfreq); > - dev_err(hba->dev, "Unable to register with devfreq %d\n", > - ret); > + ret = ufshcd_devfreq_init(hba); > + if (ret) > goto out; > - } > } > hba->clk_scaling.is_allowed = true; > } > Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com>
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index 8f22a980b1a7..2253f24309ec 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -1255,6 +1255,26 @@ static struct devfreq_dev_profile ufs_devfreq_profile = { .get_dev_status = ufshcd_devfreq_get_dev_status, }; +static int ufshcd_devfreq_init(struct ufs_hba *hba) +{ + struct devfreq *devfreq; + int ret; + + devfreq = devm_devfreq_add_device(hba->dev, + &ufs_devfreq_profile, + "simple_ondemand", + NULL); + if (IS_ERR(devfreq)) { + ret = PTR_ERR(devfreq); + dev_err(hba->dev, "Unable to register with devfreq %d\n", ret); + return ret; + } + + hba->devfreq = devfreq; + + return 0; +} + static void __ufshcd_suspend_clkscaling(struct ufs_hba *hba) { unsigned long flags; @@ -6399,16 +6419,9 @@ static int ufshcd_probe_hba(struct ufs_hba *hba) sizeof(struct ufs_pa_layer_attr)); hba->clk_scaling.saved_pwr_info.is_valid = true; if (!hba->devfreq) { - hba->devfreq = devm_devfreq_add_device(hba->dev, - &ufs_devfreq_profile, - "simple_ondemand", - NULL); - if (IS_ERR(hba->devfreq)) { - ret = PTR_ERR(hba->devfreq); - dev_err(hba->dev, "Unable to register with devfreq %d\n", - ret); + ret = ufshcd_devfreq_init(hba); + if (ret) goto out; - } } hba->clk_scaling.is_allowed = true; }
Failing to register with devfreq leaves hba->devfreq assigned, which causes the error path to dereference the ERR_PTR(). Rather than bolting on more conditionals, move the call of devm_devfreq_add_device() into it's own function and only update hba->devfreq once it's successfully registered. The subsequent patch builds upon this to make UFS actually work again, as it's been broken since f1d981eaecf8 ("PM / devfreq: Use the available min/max frequency") Reviewed-by: Subhash Jadavani <subhashj@codeaurora.org> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org> --- Changes since v1: - None drivers/scsi/ufs/ufshcd.c | 31 ++++++++++++++++++++++--------- 1 file changed, 22 insertions(+), 9 deletions(-)