korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-11-27 22:24:11 +08:00
Code Issues Packages Projects Releases Wiki Activity

i2c: dev: Check for I2C_FUNC_I2C before calling i2c_transfer

Browse Source 
It is good practice to check that the underlying adapter supports
I2C transfers before attempting them. The i2c core would eventually
return an error, but it's more efficient to fail early.

Signed-off-by: Jean Delvare <jdelvare@suse.de>
Reviewed-by: Andi Shyti <andi.shyti@kernel.org>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
This commit is contained in:
Jean Delvare 2024-05-31 11:34:07 +02:00 committed by Wolfram Sang
parent d08ed10623
commit 97ca843f6a
1 changed files with 12 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
drivers/i2c/i2c-dev.c
View File

@ -139,6 +139,10 @@ static ssize_t i2cdev_read(struct file *file, char __user *buf, size_t count,
struct i2c_client *client = file->private_data;
/* Adapter must support I2C transfers */
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
return -EOPNOTSUPP;
if (count > 8192)
count = 8192;
@ -163,6 +167,10 @@ static ssize_t i2cdev_write(struct file *file, const char __user *buf,
char *tmp;
struct i2c_client *client = file->private_data;
/* Adapter must support I2C transfers */
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
return -EOPNOTSUPP;
if (count > 8192)
count = 8192;
@ -238,6 +246,10 @@ static noinline int i2cdev_ioctl_rdwr(struct i2c_client *client,
u8 __user **data_ptrs;
int i, res;
/* Adapter must support I2C transfers */
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
return -EOPNOTSUPP;
data_ptrs = kmalloc_array(nmsgs, sizeof(u8 __user *), GFP_KERNEL);
if (data_ptrs == NULL) {
kfree(msgs);