chardev: set variable ret to -EBUSY before checking minor range overlap
When allocating dynamic major, the minor range overlap check in __register_chrdev_region() will not fail, so actually there is no real case to passing non negative error code to caller. However, set variable ret to -EBUSY before checking minor range overlap will avoid false-positive warning from code analyzing tool(like Smatch) and also make the code more easy to understand. Suggested-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Chengguang Xu <cgxu519@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
parent
17aa207e6e
commit
7ef0b15244
|
@ -98,7 +98,7 @@ __register_chrdev_region(unsigned int major, unsigned int baseminor,
|
|||
int minorct, const char *name)
|
||||
{
|
||||
struct char_device_struct *cd, *curr, *prev = NULL;
|
||||
int ret = -EBUSY;
|
||||
int ret;
|
||||
int i;
|
||||
|
||||
if (major >= CHRDEV_MAJOR_MAX) {
|
||||
|
@ -129,6 +129,7 @@ __register_chrdev_region(unsigned int major, unsigned int baseminor,
|
|||
major = ret;
|
||||
}
|
||||
|
||||
ret = -EBUSY;
|
||||
i = major_to_index(major);
|
||||
for (curr = chrdevs[i]; curr; prev = curr, curr = curr->next) {
|
||||
if (curr->major < major)
|
||||
|
|
Loading…
Reference in a new issue