LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Avri Altman <Avri.Altman@wdc.com>
To: Adrian Hunter <adrian.hunter@intel.com>,
	"Rafael J . Wysocki" <rafael@kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Saravana Kannan <saravanak@google.com>,
	"Martin K . Petersen" <martin.petersen@oracle.com>,
	"James E . J . Bottomley" <jejb@linux.ibm.com>,
	"linux-scsi@vger.kernel.org" <linux-scsi@vger.kernel.org>,
	Bean Huo <huobean@gmail.com>, Can Guo <cang@codeaurora.org>,
	Asutosh Das <asutoshd@codeaurora.org>,
	Bart Van Assche <bvanassche@acm.org>,
	"linux-pm@vger.kernel.org" <linux-pm@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: RE: [PATCH V4 2/2] scsi: ufshcd: Fix device links when BOOT WLUN fails to probe
Date: Mon, 2 Aug 2021 07:03:12 +0000	[thread overview]
Message-ID: <DM6PR04MB657536B3CDF0487E07894A16FCEF9@DM6PR04MB6575.namprd04.prod.outlook.com> (raw)
In-Reply-To: <2a19830e-47cb-4c2a-ddbc-f2370af01452@intel.com>

 
> On 17/07/21 9:02 pm, Avri Altman wrote:
> >> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> >> index 708b3b62fc4d..9864a8ee0263 100644
> >> --- a/drivers/scsi/ufs/ufshcd.c
> >> +++ b/drivers/scsi/ufs/ufshcd.c
> >> @@ -5020,15 +5020,34 @@ static int ufshcd_slave_configure(struct
> >> scsi_device
> >> *sdev)
> >>  static void ufshcd_slave_destroy(struct scsi_device *sdev)  {
> >>         struct ufs_hba *hba;
> >> +       unsigned long flags;
> >>
> >>         hba = shost_priv(sdev->host);
> >>         /* Drop the reference as it won't be needed anymore */
> >>         if (ufshcd_scsi_to_upiu_lun(sdev->lun) ==
> UFS_UPIU_UFS_DEVICE_WLUN) {
> >> -               unsigned long flags;
> >> -
> >>                 spin_lock_irqsave(hba->host->host_lock, flags);
> >>                 hba->sdev_ufs_device = NULL;
> >>                 spin_unlock_irqrestore(hba->host->host_lock, flags);
> >> +       } else if (hba->sdev_ufs_device) {
> >> +               struct device *supplier = NULL;
> >> +
> >> +               /* Ensure UFS Device WLUN exists and does not disappear */
> >> +               spin_lock_irqsave(hba->host->host_lock, flags);
> >> +               if (hba->sdev_ufs_device) {
> > Was just checked in the outer clause?
> 
> Yes, but need to re-check with the spinlock locked.
OK.
Looks good to me.
Thanks,
Avri

> 
> >
> > Thanks,
> > Avri
> >
> >> +                       supplier = &hba->sdev_ufs_device->sdev_gendev;
> >> +                       get_device(supplier);
> >> +               }
> >> +               spin_unlock_irqrestore(hba->host->host_lock, flags);
> >> +
> >> +               if (supplier) {
> >> +                       /*
> >> +                        * If a LUN fails to probe (e.g. absent BOOT WLUN), the
> >> +                        * device will not have been registered but can still
> >> +                        * have a device link holding a reference to the device.
> >> +                        */
> >> +                       device_link_remove(&sdev->sdev_gendev, supplier);
> >> +                       put_device(supplier);
> >> +               }
> >>         }
> >>  }
> >>
> >> --
> >> 2.17.1
> >


  reply	other threads:[~2021-08-02  7:03 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-16 11:44 [PATCH V4 0/2] driver core: Add ability to delete device links of unregistered devices Adrian Hunter
2021-07-16 11:44 ` [PATCH V4 1/2] driver core: Prevent warning when removing a device link from unregistered consumer Adrian Hunter
2021-07-21 15:29   ` Greg Kroah-Hartman
2021-07-16 11:44 ` [PATCH V4 2/2] scsi: ufshcd: Fix device links when BOOT WLUN fails to probe Adrian Hunter
2021-07-17 18:02   ` Avri Altman
2021-08-02  5:45     ` Adrian Hunter
2021-08-02  7:03       ` Avri Altman [this message]
2021-08-04 15:33   ` Adrian Hunter
2021-08-05 21:49     ` Bart Van Assche
2021-08-06  2:50       ` Martin K. Petersen
2021-08-06 12:59         ` Adrian Hunter
2021-08-06 13:04           ` [PATCH V5] " Adrian Hunter
2021-08-10  3:21             ` Martin K. Petersen
2021-08-17  3:17             ` Martin K. Petersen

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=DM6PR04MB657536B3CDF0487E07894A16FCEF9@DM6PR04MB6575.namprd04.prod.outlook.com \
    --to=avri.altman@wdc.com \
    --cc=adrian.hunter@intel.com \
    --cc=asutoshd@codeaurora.org \
    --cc=bvanassche@acm.org \
    --cc=cang@codeaurora.org \
    --cc=gregkh@linuxfoundation.org \
    --cc=huobean@gmail.com \
    --cc=jejb@linux.ibm.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-pm@vger.kernel.org \
    --cc=linux-scsi@vger.kernel.org \
    --cc=martin.petersen@oracle.com \
    --cc=rafael@kernel.org \
    --cc=saravanak@google.com \
    --subject='RE: [PATCH V4 2/2] scsi: ufshcd: Fix device links when BOOT WLUN fails to probe' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).