3.18-stable review patch. If anyone has any objections, please let me know.
------------------ From: Joe Thornber <[email protected]> commit f824a2af3dfbbb766c02e19df21f985bceadf0ee upstream. We never bother caching a partial block that is at the back end of the origin device. No cell ever gets locked, but the calling code was assuming it was and trying to release it. Now the code only releases if the cell has been set to a non NULL value. Signed-off-by: Joe Thornber <[email protected]> Signed-off-by: Mike Snitzer <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- drivers/md/dm-cache-target.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/drivers/md/dm-cache-target.c +++ b/drivers/md/dm-cache-target.c @@ -2554,11 +2554,11 @@ static int __cache_map(struct cache *cac static int cache_map(struct dm_target *ti, struct bio *bio) { int r; - struct dm_bio_prison_cell *cell; + struct dm_bio_prison_cell *cell = NULL; struct cache *cache = ti->private; r = __cache_map(cache, bio, &cell); - if (r == DM_MAPIO_REMAPPED) { + if (r == DM_MAPIO_REMAPPED && cell) { inc_ds(cache, bio, cell); cell_defer(cache, cell, false); } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
