[PATCH net-next 1/2] devlink: Return right error code in case of errors for region read

[Parav Pandit]

devlink_nl_cmd_region_read_dumpit() misses to return right error code on
most error conditions.
Return the right error code on such errors.

Fixes: 4e54795a27f5 ("devlink: Add support for region snapshot read command")
Signed-off-by: Parav Pandit <pa...@mellanox.com>
Acked-by: Jiri Pirko <j...@mellanox.com>

---
 net/core/devlink.c | 22 ++++++++++++++++------
 1 file changed, 16 insertions(+), 6 deletions(-)

diff --git a/net/core/devlink.c b/net/core/devlink.c
index 5e2ef5a..8a198ba 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -3643,26 +3643,34 @@ static int devlink_nl_cmd_region_read_dumpit(struct 
sk_buff *skb,
                goto out;
 
        devlink = devlink_get_from_attrs(sock_net(cb->skb->sk), attrs);
-       if (IS_ERR(devlink))
+       if (IS_ERR(devlink)) {
+               err = -ENODEV;
                goto out;
+       }
 
        mutex_lock(&devlink_mutex);
        mutex_lock(&devlink->lock);
 
        if (!attrs[DEVLINK_ATTR_REGION_NAME] ||
-           !attrs[DEVLINK_ATTR_REGION_SNAPSHOT_ID])
+           !attrs[DEVLINK_ATTR_REGION_SNAPSHOT_ID]) {
+               err = -EINVAL;
                goto out_unlock;
+       }
 
        region_name = nla_data(attrs[DEVLINK_ATTR_REGION_NAME]);
        region = devlink_region_get_by_name(devlink, region_name);
-       if (!region)
+       if (!region) {
+               err = -EINVAL;
                goto out_unlock;
+       }
 
        hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
                          &devlink_nl_family, NLM_F_ACK | NLM_F_MULTI,
                          DEVLINK_CMD_REGION_READ);
-       if (!hdr)
+       if (!hdr) {
+               err = -EMSGSIZE;
                goto out_unlock;
+       }
 
        err = devlink_nl_put_handle(skb, devlink);
        if (err)
@@ -3673,8 +3681,10 @@ static int devlink_nl_cmd_region_read_dumpit(struct 
sk_buff *skb,
                goto nla_put_failure;
 
        chunks_attr = nla_nest_start(skb, DEVLINK_ATTR_REGION_CHUNKS);
-       if (!chunks_attr)
+       if (!chunks_attr) {
+               err = -EMSGSIZE;
                goto nla_put_failure;
+       }
 
        if (attrs[DEVLINK_ATTR_REGION_CHUNK_ADDR] &&
            attrs[DEVLINK_ATTR_REGION_CHUNK_LEN]) {
@@ -3715,7 +3725,7 @@ static int devlink_nl_cmd_region_read_dumpit(struct 
sk_buff *skb,
        mutex_unlock(&devlink->lock);
        mutex_unlock(&devlink_mutex);
 out:
-       return 0;
+       return err;
 }
 
 struct devlink_info_req {
-- 
1.8.3.1