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iomap: fix WARN_ON_ONCE on uninitialized variable 

In commit 9dc55f1389 ("iomap: add support for sub-pagesize buffered
I/O without buffer heads") we moved the initialization of poff (it's
computed from pos) into a separate helper function.  Inline data only
ever deals with pos == 0, hence the WARN_ON_ONCE, but now we're testing
an uninitialized variable.

Therefore, change the test to check the parameter directly.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Allison Henderson <allison.henderson@oracle.com>
Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com>
This commit is contained in:
Darrick J. Wong 2018-08-10 17:55:57 -07:00
parent 1fc25f51d7
commit 7d5e049e72
1 changed files with 1 additions and 1 deletions
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2
fs/iomap.c
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@ -290,7 +290,7 @@ iomap_readpage_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
sector_t sector;
if (iomap->type == IOMAP_INLINE) {
WARN_ON_ONCE(poff);
WARN_ON_ONCE(pos);
iomap_read_inline_data(inode, page, iomap);
return PAGE_SIZE;
}