tree 57418c2346242b7ed26284f6c8cab90936fc6cbd
parent 5a7389f1876e1f5e262a56972142e3ea607c8d05
author Keith Busch <kbusch@kernel.org> 1663859627 -0700
committer Meena Shanmugam <meenashanmugam@google.com> 1669941131 +0000

nvme: ensure subsystem reset is single threaded

commit 1e866afd4bcdd01a70a5eddb4371158d3035ce03 upstream.

The subsystem reset writes to a register, so we have to ensure the
device state is capable of handling that otherwise the driver may access
unmapped registers. Use the state machine to ensure the subsystem reset
doesn't try to write registers on a device already undergoing this type
of reset.

BUG=b/246924114
TEST=presubmit,validation
RELEASE_NOTE=Fixes CVE-2022-3169 in the Linux kernel.

cos-patch: security-moderate
Link: https://bugzilla.kernel.org/show_bug.cgi?id=214771
Signed-off-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ovidiu Panait <ovidiu.panait@windriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Change-Id: If1bce9edc8120cc4dbe1f913bb22692756d33456
Reviewed-on: https://cos-review.googlesource.com/c/third_party/kernel/+/39448
Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
Reviewed-by: Oleksandr Tymoshenko <ovt@google.com>