linux-kernel - [PATCH V2 0/2] driver core: Add ability to delete device links of unregistered devices

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Date:   Fri,  9 Jul 2021 09:43:39 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     "Rafael J . Wysocki" <rafael@...nel.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Saravana Kannan <saravanak@...gle.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        "James E . J . Bottomley" <jejb@...ux.ibm.com>,
        linux-scsi@...r.kernel.org, Avri Altman <avri.altman@....com>,
        Bean Huo <huobean@...il.com>, Can Guo <cang@...eaurora.org>,
        Asutosh Das <asutoshd@...eaurora.org>,
        Bart Van Assche <bvanassche@....org>,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH V2 0/2] driver core: Add ability to delete device links of unregistered devices

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.

These V2 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 V2:

	Take approach suggested by Rafael

Adrian Hunter (2):
      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       | 11 ++++++++---
 drivers/scsi/ufs/ufshcd.c | 23 +++++++++++++++++++++--
 2 files changed, 29 insertions(+), 5 deletions(-)

Regards
Adrian