From mboxrd@z Thu Jan 1 00:00:00 1970 From: Subhash Jadavani Subject: Re: [PATCH 2/3] scsi: ufs: Extract devfreq registration Date: Tue, 24 Apr 2018 14:08:09 -0700 Message-ID: <41c6fd36826ee853c86b3fb3e069903c@codeaurora.org> References: <20180424002016.9205-1-bjorn.andersson@linaro.org> <20180424002016.9205-3-bjorn.andersson@linaro.org> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20180424002016.9205-3-bjorn.andersson@linaro.org> Sender: linux-kernel-owner@vger.kernel.org To: Bjorn Andersson Cc: Vinayak Holikatti , "James E.J. Bottomley" , "Martin K. Petersen" , MyungJoo Ham , Kyungmin Park , Chanwoo Choi , linux-scsi@vger.kernel.org, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, Vivek Gautam , linux-scsi-owner@vger.kernel.org List-Id: linux-arm-msm@vger.kernel.org On 2018-04-23 17:20, 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") > > Signed-off-by: Bjorn Andersson > --- > 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", > + 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; > } Looks good to me. Reviewed-by: Subhash Jadavani -- The Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project