From: Leon Romanovsky <leonro@mellanox.com>
Date: Wed, 21 Feb 2018 18:12:36 +0200
Subject: RDMA/uverbs: Unify return values of not supported command
Patch-mainline: v4.17-rc1
Git-commit: f2630ce2fb93eab5f50aa00dac7ae24a3b4ce17f
References: bsc#1103992 FATE#326009

The non-existing command is supposed to return -EOPNOTSUPP, but the
current code returns different errors for different flows for the
same failure. This patch unifies those flows.

Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/infiniband/core/uverbs_main.c |   16 ++++------------
 1 file changed, 4 insertions(+), 12 deletions(-)

--- a/drivers/infiniband/core/uverbs_main.c
+++ b/drivers/infiniband/core/uverbs_main.c
@@ -653,9 +653,11 @@ static bool verify_command_mask(struct i
 static bool verify_command_idx(u32 command, bool extended)
 {
 	if (extended)
-		return command < ARRAY_SIZE(uverbs_ex_cmd_table);
+		return command < ARRAY_SIZE(uverbs_ex_cmd_table) &&
+		       uverbs_ex_cmd_table[command];
 
-	return command < ARRAY_SIZE(uverbs_cmd_table);
+	return command < ARRAY_SIZE(uverbs_cmd_table) &&
+	       uverbs_cmd_table[command];
 }
 
 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
@@ -730,11 +732,6 @@ static ssize_t ib_uverbs_write(struct fi
 	}
 
 	if (!flags) {
-		if (!uverbs_cmd_table[command]) {
-			ret = -EINVAL;
-			goto out;
-		}
-
 		if (hdr.in_words * 4 != count) {
 			ret = -EINVAL;
 			goto out;
@@ -749,11 +746,6 @@ static ssize_t ib_uverbs_write(struct fi
 		struct ib_udata uhw;
 		size_t written_count = count;
 
-		if (!uverbs_ex_cmd_table[command]) {
-			ret = -ENOSYS;
-			goto out;
-		}
-
 		if (!file->ucontext) {
 			ret = -EINVAL;
 			goto out;