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([10.239.96.51]) by orviesa004.jf.intel.com with ESMTP; 07 Jun 2025 06:06:31 -0700 From: Yi Sun To: vinicius.gomes@intel.com, dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org Cc: yi.sun@intel.com, gordon.jin@intel.com Subject: [PATCH v2 2/2] dmaengine: idxd: Fix refcount underflow on module unload Date: Sat, 7 Jun 2025 21:06:16 +0800 Message-ID: <20250607130616.514984-3-yi.sun@intel.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250607130616.514984-1-yi.sun@intel.com> References: <20250607130616.514984-1-yi.sun@intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" A recent refactor introduced a misplaced put_device() call, leading to a reference count underflow during module unload. There is no need to add additional put_device() calls for idxd groups, engines, or workqueues. Although commit a409e919ca3 claims:"Note, this also fixes the missing put_device() for idxd groups, engines, and wqs." It appears no such omission existed. The required cleanup is already handled by the call chain: idxd_unregister_devices() -> device_unregister() -> put_device() Extend idxd_cleanup() to perform the necessary cleanup, and remove idxd_cleanup_internals() which was not originally part of the driver unload path and introduced unintended reference count underflow. Fixes: a409e919ca32 ("dmaengine: idxd: Refactor remove call with idxd_clean= up() helper") Signed-off-by: Yi Sun diff --git a/drivers/dma/idxd/init.c b/drivers/dma/idxd/init.c index 504aca0fd597..a5eabeb6a8bd 100644 --- a/drivers/dma/idxd/init.c +++ b/drivers/dma/idxd/init.c @@ -1321,7 +1321,12 @@ static void idxd_remove(struct pci_dev *pdev) device_unregister(idxd_confdev(idxd)); idxd_shutdown(pdev); idxd_device_remove_debugfs(idxd); - idxd_cleanup(idxd); + perfmon_pmu_remove(idxd); + idxd_cleanup_interrupts(idxd); + if (device_pasid_enabled(idxd)) + idxd_disable_system_pasid(idxd); + if (device_user_pasid_enabled(idxd)) + idxd_disable_sva(idxd->pdev); pci_iounmap(pdev, idxd->reg_base); put_device(idxd_confdev(idxd)); pci_disable_device(pdev); --=20 2.43.0