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authorChengguang Xu <cgxu519@gmail.com>2019-05-02 15:15:05 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-05-24 21:50:36 +0300
commit7ef0b1524417743e6861490420225affe451486b (patch)
treecd11afb441a7cd2abc48bc1a0860482a540e4abd /fs/char_dev.c
parent17aa207e6e08b0bcf92cf7b473fae9a70e325dbe (diff)
downloadlinux-7ef0b1524417743e6861490420225affe451486b.tar.xz
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>
Diffstat (limited to 'fs/char_dev.c')
-rw-r--r--fs/char_dev.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/char_dev.c b/fs/char_dev.c
index d18cad28c1c3..00dfe17871ac 100644
--- a/fs/char_dev.c
+++ b/fs/char_dev.c
@@ -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)