lkml.org 
[lkml]   [2018]   [Apr]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 2/3] scsi: ufs: Extract devfreq registration
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 <bjorn.andersson@linaro.org>
> ---
> 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 <subhashj@codeaurora.org>

--
The Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

\
 
 \ /
  Last update: 2018-04-24 23:09    [W:0.253 / U:0.124 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site