linux-kernel - [PATCH 2/4] uacce: fix isolate sysfs check condition

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Message-ID: <20250822103904.3776304-3-huangchenghai2@huawei.com>
Date: Fri, 22 Aug 2025 18:39:02 +0800
From: Chenghai Huang <huangchenghai2@...wei.com>
To: <gregkh@...uxfoundation.org>, <zhangfei.gao@...aro.org>,
	<wangzhou1@...ilicon.com>
CC: <linux-kernel@...r.kernel.org>, <linuxarm@...wei.com>,
	<linux-crypto@...r.kernel.org>, <fanghao11@...wei.com>,
	<shenyang39@...wei.com>, <qianweili@...wei.com>, <linwenkai6@...ilicon.com>,
	<liulongfang@...wei.com>
Subject: [PATCH 2/4] uacce: fix isolate sysfs check condition

The uacce supports device isolation feature. If the driver
implements the isolate_err_threshold_read and
isolate_err_threshold_write callbacks, the uacce will create sysfs
files. Users can read and configure isolation policies through
sysfs. Currently, if either isolate_err_threshold_read or
isolate_err_threshold_write callback exists, sysfs files are
created.

However, accessing a non-existent callback may cause a system panic.
Therefore, sysfs files are only created when both
isolate_err_threshold_read and isolate_err_threshold_write are
present.

Fixes: e3e289fbc0b5 ("uacce: supports device isolation feature")
Signed-off-by: Chenghai Huang <huangchenghai2@...wei.com>
---
 drivers/misc/uacce/uacce.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/misc/uacce/uacce.c b/drivers/misc/uacce/uacce.c
index 3604f722ed60..6a38809ca819 100644
--- a/drivers/misc/uacce/uacce.c
+++ b/drivers/misc/uacce/uacce.c
@@ -441,7 +441,7 @@ static umode_t uacce_dev_is_visible(struct kobject *kobj,
 		return 0;

 	if (attr == &dev_attr_isolate_strategy.attr &&
-	    (!uacce->ops->isolate_err_threshold_read &&
+	    (!uacce->ops->isolate_err_threshold_read ||
 	     !uacce->ops->isolate_err_threshold_write))
 		return 0;

-- 
2.33.0