mm/damon/sysfs: do not ignore callback's return value in damon_sysfs_damon_call()
The callback return value is ignored in damon_sysfs_damon_call(), which
means that it is not possible to detect invalid user input when writing
commands such as 'commit' to
/sys/kernel/mm/damon/admin/kdamonds/<K>/state. Fix it.
Link: https://lkml.kernel.org/r/20250920132546.5822-1-akinobu.mita@gmail.com
Fixes: f64539dcdb87 ("mm/damon/sysfs: use damon_call() for update_schemes_stats")
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Reviewed-by: SeongJae Park <sj@kernel.org>
Cc: <stable@vger.kernel.org> [6.14+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
diff --git a/mm/damon/sysfs.c b/mm/damon/sysfs.c
index c96c215..7308dee 100644
--- a/mm/damon/sysfs.c
+++ b/mm/damon/sysfs.c
@@ -1592,12 +1592,14 @@ static int damon_sysfs_damon_call(int (*fn)(void *data),
struct damon_sysfs_kdamond *kdamond)
{
struct damon_call_control call_control = {};
+ int err;
if (!kdamond->damon_ctx)
return -EINVAL;
call_control.fn = fn;
call_control.data = kdamond;
- return damon_call(kdamond->damon_ctx, &call_control);
+ err = damon_call(kdamond->damon_ctx, &call_control);
+ return err ? err : call_control.return_code;
}
struct damon_sysfs_schemes_walk_data {
