diff --git a/uadk-access-the-file-isolate-before-read-it.patch b/uadk-access-the-file-isolate-before-read-it.patch
new file mode 100644
index 0000000..d5b462c
--- /dev/null
+++ b/uadk-access-the-file-isolate-before-read-it.patch
@@ -0,0 +1,60 @@
+From 3b86295963c24a1dc0ec0da9e1e7f16aced8f3a4 Mon Sep 17 00:00:00 2001
+From: Yang Shen <shenyang39@huawei.com>
+Date: Tue, 24 Aug 2021 11:24:25 +0800
+Subject: [PATCH] uadk: 'access' the file 'isolate' before read it
+
+The feature 'isolate' isn't enabled for all 'uacce' versions. So need check
+whether this feature is enabled before read it value.
+
+Signed-off-by: Yang Shen <shenyang39@huawei.com>
+---
+ wd.c | 25 ++++++++++++++++++++++---
+ 1 file changed, 22 insertions(+), 3 deletions(-)
+
+diff --git a/uadk/wd.c b/uadk/wd.c
+index 2d7fc49..bc347e7 100644
+--- a/uadk/wd.c
++++ b/uadk/wd.c
+@@ -104,17 +104,36 @@ static int get_str_attr(struct uacce_dev *dev, char *attr, char *buf,
+ 	return ret;
+ }
+
++static int access_attr(char *dev_root, char *attr, int mode)
++{
++	char attr_file[PATH_STR_SIZE];
++	ssize_t size;
++
++	if (!dev_root || !attr)
++		return -WD_EINVAL;
++
++	size = snprintf(attr_file, PATH_STR_SIZE, "%s/%s", dev_root, attr);
++	if (size < 0)
++		return -WD_EINVAL;
++
++	return access(attr_file, mode);
++}
++
+ static int get_dev_info(struct uacce_dev *dev)
+ {
+ 	int value = 0;
++	int ret;
+
+ 	get_int_attr(dev, "flags", &dev->flags);
+ 	get_str_attr(dev, "api", dev->api, WD_NAME_SIZE);
+
+ 	/* hardware err isolate flag */
+-	get_int_attr(dev, "isolate", &value);
+-	if (value == 1)
+-		return -ENODEV;
++	ret = access_attr(dev->dev_root, "isolate", F_OK);
++	if (!ret) {
++		get_int_attr(dev, "isolate", &value);
++		if (value == 1)
++			return -ENODEV;
++	}
+
+ 	get_str_attr(dev, "algorithms", dev->algs, MAX_ATTR_STR_SIZE);
+ 	get_int_attr(dev, "region_mmio_size", &value);
+--
+2.33.0
+
diff --git a/warpdrive.spec b/warpdrive.spec
index 79d29c5..868ed67 100644
--- a/warpdrive.spec
+++ b/warpdrive.spec
@@ -1,12 +1,12 @@
 Name:          libwd
 Summary:       User Space Accelerator Development Kit
 Version:       2.3.11
-Release:       3
+Release:       4
 License:       Apache-2.0
 Source:        %{name}-%{version}.tar.gz
 Vendor:        Huawei Corporation
 ExclusiveOS:   linux
-URL:           https://support.huawei.com 
+URL:           https://support.huawei.com
 BuildRoot:     %{_tmppath}/%{name}-%{version}-root
 Conflicts:     %{name} < %{version}-%{release}
 Provides:      %{name} = %{version}-%{release}
@@ -15,6 +15,7 @@ BuildRequires: automake, autoconf, libtool
 BuildRequires: gcc, make
 ExclusiveArch: aarch64
 Patch0001:     bugfix-of-gcc-10.patch
+Patch0002:     uadk-access-the-file-isolate-before-read-it.patch
 
 %description
 This package contains the User Space Accelerator Library
@@ -155,6 +156,9 @@ fi
 /sbin/ldconfig
 
 %changelog
+* Fri Sep 03 2021 Yang Shen <shenyang39@huawei.com>2.3.11-4
+- uadk-access-the-file-isolate-before-read-it.patch
+
 * Fri Aug 06 2021 Pengju Jiang <jiangpengju2@huawei.com>2.3.11-3
 - bugfix-of-gcc-10.patch