Public bug reported:
[Impact]
When error handling progresses to host reset, several issues may prevent the
system from recovering, therefore requiring a system power cycle.
[Test Case]
$ iozone -a &
$ while :; do sudo sg_reset --device /dev/sda; sleep 5; done
[Fix]
There is a race between device removal and host reset which can cause the
driver to hang, preventing the user from accessing attached devices until a
reboot. Fix this by adding locking around the critical path.
After a soft host reset, commands maybe sent to the device before the
hardware is ready to receive them. This can result in additional errors
when the user access the device. Fix this by blocking commands until the
hardware has been reinitialized.
Stale PHY events may still get processed by the driver after reset. This
can cause e.g. ports to be detached because an old pre-reset "phy down"
event gets processed, causing the user to lose access to attached
devices. Fix this by filtering out pre-reset PHY events.
Resource starvation can occur after a "clear nexus ha" reset. Fix this
by releasing those resources during the reset.
[Regression Risk]
The required fixes are localized to the hisi_sas driver. This driver is only
used by two platforms supported by Ubuntu: HiSilicon D05 and HiSilicon D06. We
will directly verify these fixes on those platforms.
** Affects: linux (Ubuntu)
Importance: Undecided
Assignee: dann frazier (dannf)
Status: In Progress
** Affects: linux (Ubuntu Bionic)
Importance: Undecided
Assignee: dann frazier (dannf)
Status: In Progress
** Also affects: linux (Ubuntu Bionic)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu)
Status: New => In Progress
** Changed in: linux (Ubuntu Bionic)
Status: New => In Progress
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => dann frazier (dannf)
** Changed in: linux (Ubuntu Bionic)
Assignee: (unassigned) => dann frazier (dannf)
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https://bugs.launchpad.net/bugs/1777696
Title:
hisi_sas: Failures during host reset
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