linux-kernel - [PATCH v4 vfio 0/2] vfio/pds: Fixes for locking bugs

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Message-ID: <20231122192532.25791-1-brett.creeley@amd.com>
Date:   Wed, 22 Nov 2023 11:25:30 -0800
From:   Brett Creeley <brett.creeley@....com>
To:     <jgg@...pe.ca>, <yishaih@...dia.com>,
        <shameerali.kolothum.thodi@...wei.com>, <kevin.tian@...el.com>,
        <alex.williamson@...hat.com>, <kvm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     <shannon.nelson@....com>, <brett.creeley@....com>
Subject: [PATCH v4 vfio 0/2] vfio/pds: Fixes for locking bugs

This series contains fixes for locking bugs in the recently introduced
pds-vfio-pci driver. There was an initial bug reported by Dan Carpenter
at:

https://lore.kernel.org/kvm/1f9bc27b-3de9-4891-9687-ba2820c1b390@moroto.mountain/

However, more locking bugs were found when looking into the previously
mentioned issue. So, all fixes are included in this series.

v4:
- Drop patch 1/3 since it added a spinlock_init that was later replaced
  by a mutex_init anyway

v3:
https://lore.kernel.org/kvm/20231027223651.36047-1-brett.creeley@amd.com/
- Change reset lock from spinlock to mutex

v2:
https://lore.kernel.org/kvm/20231011230115.35719-1-brett.creeley@amd.com/
- Trim the OOPs in the patch commit messages
- Rework patch 3/3 to only unlock the spinlock once
- Destroy the state_mutex in the driver specific vfio_device_ops.release
  callback

v1:
https://lore.kernel.org/kvm/20230914191540.54946-1-brett.creeley@amd.com/

Brett Creeley (2):
  vfio/pds: Fix mutex lock->magic != lock warning
  vfio/pds: Fix possible sleep while in atomic context

 drivers/vfio/pci/pds/pci_drv.c  |  4 ++--
 drivers/vfio/pci/pds/vfio_dev.c | 30 +++++++++++++++++++++---------
 drivers/vfio/pci/pds/vfio_dev.h |  2 +-
 3 files changed, 24 insertions(+), 12 deletions(-)

-- 
2.17.1