7c7cfdcf7f
Fix the following BUG:
[ 187.065689] BUG: kernel NULL pointer dereference, address: 000000000000001c
[ 187.065790] RIP: 0010:ufshcd_vreg_set_hpm+0x3c/0x110 [ufshcd_core]
[ 187.065938] Call Trace:
[ 187.065959] ufshcd_resume+0x72/0x290 [ufshcd_core]
[ 187.065980] ufshcd_system_resume+0x54/0x140 [ufshcd_core]
[ 187.065993] ? pci_pm_restore+0xb0/0xb0
[ 187.066005] ufshcd_pci_resume+0x15/0x20 [ufshcd_pci]
[ 187.066017] pci_pm_thaw+0x4c/0x90
[ 187.066030] dpm_run_callback+0x5b/0x150
[ 187.066043] device_resume+0x11b/0x220
Voltage regulators are optional, so functions must check they exist
before dereferencing.
Note this issue is hidden if CONFIG_REGULATORS is not set, because the
offending code is optimised away.
Notes for stable:
The issue first appears in commit 57d104c153d3 ("ufs: add UFS power
management support") but is inadvertently fixed in commit 60f0187031c0
("scsi: ufs: disable vccq if it's not needed by UFS device") which in
turn was reverted by commit 730679817d83 ("Revert "scsi: ufs: disable vccq
if it's not needed by UFS device""). So fix applies v3.18 to v4.5 and
v5.1+
Fixes: 57d104c153d3 ("ufs: add UFS power management support")
Fixes: 730679817d83 ("Revert "scsi: ufs: disable vccq if it's not needed by UFS device"")
Cc: stable@vger.kernel.org
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.