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| author | Chengguang Xu <cgxu519@gmail.com> | 2019-05-02 20:15:05 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-05-24 20:50:36 +0200 |
| commit | 7ef0b1524417743e6861490420225affe451486b (patch) | |
| tree | cd11afb441a7cd2abc48bc1a0860482a540e4abd /fs/char_dev.c | |
| parent | 17aa207e6e08b0bcf92cf7b473fae9a70e325dbe (diff) | |
| download | linux-rpi-7ef0b1524417743e6861490420225affe451486b.tar.gz linux-rpi-7ef0b1524417743e6861490420225affe451486b.tar.bz2 linux-rpi-7ef0b1524417743e6861490420225affe451486b.zip | |
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.c | 3 |
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) |