linux-kernel - [PATCH v6 0/4] uacce: driver fixes for memory leaks and state management

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Message-ID: <20251202061256.4158641-1-huangchenghai2@huawei.com>
Date: Tue, 2 Dec 2025 14:12:52 +0800
From: Chenghai Huang <huangchenghai2@...wei.com>
To: <gregkh@...uxfoundation.org>, <zhangfei.gao@...aro.org>,
	<wangzhou1@...ilicon.com>
CC: <linux-kernel@...r.kernel.org>, <linux-crypto@...r.kernel.org>,
	<fanghao11@...wei.com>, <shenyang39@...wei.com>, <liulongfang@...wei.com>,
	<qianweili@...wei.com>, <linwenkai6@...ilicon.com>
Subject: [PATCH v6 0/4] uacce: driver fixes for memory leaks and state management

This patch series addresses several issues in the uacce:
1.Fix cdev handling in the cleanup path.
2.Fix sysfs file creation conditions.
3.Add error reporting for unsupported mremap operations.
4.Ensuring safe queue release with proper state management.

---
Changes in v6:
- In patch 1, if cdev_device_add() fails, it will automatically free the cdev, however,
  we need to set uacce->cdev to NULL to prevent cdev_device_del() from being called.
- Link to v5: https://lore.kernel.org/all/20251111093536.3729-1-huangchenghai2@huawei.com/

Changes in v5:
- There is no memory leak issue when cdev_device_add fails, but it is necessary
  to check a flag to avoid calling cdev_device_del during abnormal exit.
- Link to v4: https://lore.kernel.org/all/20251022021149.1771168-1-huangchenghai2@huawei.com/

Changes in v4:
- Revert the interception of sysfs creation for isolate_strategy.
- Link to v3: https://lore.kernel.org/all/20251021135003.786588-1-huangchenghai2@huawei.com/

Changes in v3:
- Move the checks for the 'isolate_strategy_show' and
  'isolate_strategy_store' functions to their respective call sites.
- Use kobject_put to release the cdev memory instead of modifying
  cdev to be a static structure member.
- Link to v2: https://lore.kernel.org/all/20250916144811.1799687-1-huangchenghai2@huawei.com/

Changes in v2:
- Use cdev_init to allocate cdev memory to ensure that memory leaks
  are avoided.
- Supplement the reason for intercepting the remapping operation.
- Add "cc: stable@...r.kernel.org" to paths with fixed.
- Link to v1: https://lore.kernel.org/all/20250822103904.3776304-1-huangchenghai2@huawei.com/

Chenghai Huang (2):
  uacce: fix isolate sysfs check condition
  uacce: ensure safe queue release with state management

Wenkai Lin (1):
  uacce: fix cdev handling in the cleanup path

Yang Shen (1):
  uacce: implement mremap in uacce_vm_ops to return -EPERM

 drivers/misc/uacce/uacce.c | 48 +++++++++++++++++++++++++++++++-------
 1 file changed, 40 insertions(+), 8 deletions(-)

-- 
2.33.0