IB/uverbs: Return ENOSYS for unimplemented commands (not EINVAL)

Since the original commit 883a99c ("[IB] uverbs: Add a mask of device
methods allowed for userspace"), the uverbs core returns EINVAL for
commands not implemented by a specific low-level driver.

This creates a problem that there is no way to tell the difference
between an unimplemented command and an implemented one which is
incorrectly invoked (which also returns EINVAL).

The fix is to have unimplemented commands return ENOSYS.

Signed-off-by: Jack Morgenstein <jackm@dev.mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

drivers/infiniband/core/uverbs_main.c

@@ -584,14 +584,16 @@ static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
 
 	if (hdr.command < 0				||
 	    hdr.command >= ARRAY_SIZE(uverbs_cmd_table) ||
-	    !uverbs_cmd_table[hdr.command]		||
-	    !(file->device->ib_dev->uverbs_cmd_mask & (1ull << hdr.command)))
+	    !uverbs_cmd_table[hdr.command])
 		return -EINVAL;
 
 	if (!file->ucontext &&
 	    hdr.command != IB_USER_VERBS_CMD_GET_CONTEXT)
 		return -EINVAL;
 
+	if (!(file->device->ib_dev->uverbs_cmd_mask & (1ull << hdr.command)))
+		return -ENOSYS;
+
 	return uverbs_cmd_table[hdr.command](file, buf + sizeof hdr,
 					     hdr.in_words * 4, hdr.out_words * 4);
 }