linux-kernel - [PATCH v2 0/2] dmaengine: idxd: Fix up re-enabling device workqueues

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Message-Id: <20220928154856.623545-1-jsnitsel@redhat.com>
Date:   Wed, 28 Sep 2022 08:48:54 -0700
From:   Jerry Snitselaar <jsnitsel@...hat.com>
To:     linux-kernel@...r.kernel.org, dmaengine@...r.kernel.org
Cc:     Fenghua Yu <fenghua.yu@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Vinod Koul <vkoul@...nel.org>
Subject: [PATCH v2 0/2] dmaengine: idxd: Fix up re-enabling device workqueues

Currently if a software reset is attempted on an idxd device
the workqueues will not be re-enabled, because it will see
incorrectly see that wq->state is already set to IDXD_WQ_ENABLED.
So set the workqueue state to disabled in idxd_wq_disable_cleanup(),
and use a bitmap to track which workqueues have been enabled so they
can be re-enabled during device re-initialization.

Changes from v1 to v2:
- Clear bit in case where idxd_wq_enable() fails during re-init.


Cc: Fenghua Yu <fenghua.yu@...el.com>
Cc: Dave Jiang <dave.jiang@...el.com>
Cc: Vinod Koul <vkoul@...nel.org>

Jerry Snitselaar (2):
  dmaengine: idxd: Set wq state to disabled in idxd_wq_disable_cleanup()
  dmaengine: idxd: track enabled workqueues in bitmap

 drivers/dma/idxd/device.c | 4 +++-
 drivers/dma/idxd/idxd.h   | 2 ++
 drivers/dma/idxd/init.c   | 6 ++++++
 drivers/dma/idxd/irq.c    | 5 +++--
 drivers/dma/idxd/sysfs.c  | 1 +
 5 files changed, 15 insertions(+), 3 deletions(-)

-- 
2.37.2