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From:   Adrian Hunter <adrian.hunter@intel.com>
To:     "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, Avri Altman <avri.altman@wdc.com>,
        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-kernel@vger.kernel.org
Subject: [PATCH V3 0/3] driver core: Add ability to delete device links of unregistered devices
Date:   Sat, 10 Jul 2021 13:38:16 +0300
Message-Id: <20210710103819.12532-1-adrian.hunter@intel.com>
Organization: Intel Finland Oy, Registered Address: PL 281, 00181 Helsinki, Business Identity Code: 0357606 - 4, Domiciled in Helsinki
Precedence: bulk

Hi

There is an issue with the SCSI UFS driver when the optional
BOOT well-known LUN fails to probe, which is not a fatal error.
The issue is that the device and its "managed" device link do not
then get deleted.  The device because the device link has a
reference to it.  The device link because it can only be deleted
by device_del(), but device_add() was never called, so device_del()
never will be either.

Since V2, these patches fix the issue by amending device link removal to
accept removal of a link with an unregistered consumer device, as suggested
by Rafael.


Changes in V3:

    driver core: Prevent warning when removing a device link from unregistered consumer
	New patch split from "driver core: Add ability to delete device
	links of unregistered devices" except first chunk from that patch
	dropped as unnecessary

    driver core: Add ability to delete device links of unregistered devices
	Move warning fix to separate patch.


Changes in V2:

    Take approach suggested by Rafael


Adrian Hunter (3):
      driver core: Prevent warning when removing a device link from unregistered consumer
      driver core: Add ability to delete device links of unregistered devices
      scsi: ufshcd: Fix device links when BOOT WLUN fails to probe

 drivers/base/core.c       |  8 ++++++--
 drivers/scsi/ufs/ufshcd.c | 23 +++++++++++++++++++++--
 2 files changed, 27 insertions(+), 4 deletions(-)


Regards
Adrian