linux-kernel - [PATCH v2 0/2] Drivers: hv: util: Two fixes in util

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Message-Id: <20241106154247.2271-1-mhklinux@outlook.com>
Date: Wed,  6 Nov 2024 07:42:45 -0800
From: mhkelley58@...il.com
To: kys@...rosoft.com,
	haiyangz@...rosoft.com,
	wei.liu@...nel.org,
	decui@...rosoft.com,
	gregkh@...uxfoundation.org,
	vkuznets@...hat.com
Cc: linux-hyperv@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 0/2] Drivers: hv: util: Two fixes in util_probe()

From: Michael Kelley <mhklinux@...look.com>

Patch 1 fixes util_probe() to not force the error return value to
ENODEV when the util_init function fails -- just return the error
code from util_init so the real error code is displayed in messages.

Patch 2 fixes a more serious race condition between initialization
of the VMBus channel and initial operations of the user space
daemons for KVP and VSS. The fix reorders the initialization in
util_probe() so the race condition can't happen.

The two fixes are functionally independent, but Patch 2 introduces
the util_init_transport function that parallels the existing code
for the util_init function. Doing Patch 1 first avoids an
inconsistency in the error handling in similar code for these two
parts of util_probe().

This series is v2 of a single patch first posted by Dexuan Cui
to fix the race condition.[1] I've taken over the patch per
discussion with Dexuan.

[1] https://lore.kernel.org/linux-hyperv/20240909164719.41000-1-decui@microsoft.com/

Michael Kelley (2):
  Drivers: hv: util: Don't force error code to ENODEV in util_probe()
  Drivers: hv: util: Avoid accessing a ringbuffer not initialized yet

 drivers/hv/hv_kvp.c       |  6 ++++++
 drivers/hv/hv_snapshot.c  |  6 ++++++
 drivers/hv/hv_util.c      | 13 ++++++++++---
 drivers/hv/hyperv_vmbus.h |  2 ++
 include/linux/hyperv.h    |  1 +
 5 files changed, 25 insertions(+), 3 deletions(-)

-- 
2.25.1