call trace: -> mapping_store() -> range_parse() ...... rc = -ENXIO; According to context, the error return value of range_parse should be negative. Signed-off-by: Zhang Qilong <zhangqilong3(a)huawei.com&gt; --- drivers/dax/bus.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/dax/bus.c b/drivers/dax/bus.c index 27513d311242..e15a1a7c2853 100644 --- a/drivers/dax/bus.c +++ b/drivers/dax/bus.c @@ -1047,7 +1047,7 @@ static ssize_t range_parse(const char *opt, size_t len, struct range *range) { unsigned long long addr = 0; char *start, *end, *str; - ssize_t rc = EINVAL; + ssize_t rc = -EINVAL; str = kstrdup(opt, GFP_KERNEL); if (!str) -- 2.17.1