grub2/0127-efi-net-Print-a-debug-message-if-parsing-the-address.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Javier Martinez Canillas <javierm@redhat.com>
Date: Tue, 10 Mar 2020 11:23:49 +0100
Subject: [PATCH] efi/net: Print a debug message if parsing the address fails

Currently if parsing the address fails an error message is printed. But in
most cases this isn't a fatal error since the grub_efi_net_parse_address()
function is only used to match an address with a network interface to use.

And if this fails, the default interface is used which is good enough for
most cases. So instead of printing an error that would pollute the console
just print a debug message if the address is not parsed correctly.

A user can enable debug messages for the efinet driver to have information
about the failure and the fact that the default interface is being used.

Related: rhbz#1732765

Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
---
 grub-core/net/efi/net.c | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/grub-core/net/efi/net.c b/grub-core/net/efi/net.c
index 84573937b1..a3f0535d43 100644
--- a/grub-core/net/efi/net.c
+++ b/grub-core/net/efi/net.c
@@ -778,9 +778,9 @@ grub_efi_net_parse_address (const char *address,
 	}
     }
 
-  return grub_error (GRUB_ERR_NET_BAD_ADDRESS,
-		   N_("unrecognised network address `%s'"),
-		   address);
+  grub_dprintf ("efinet", "unrecognised network address '%s'\n", address);
+
+  return GRUB_ERR_NET_BAD_ADDRESS;
 }
 
 static grub_efi_net_interface_t *
@@ -795,10 +795,7 @@ match_route (const char *server)
   err = grub_efi_net_parse_address (server, &ip4, &ip6, &is_ip6, 0);
 
   if (err)
-    {
-      grub_print_error ();
       return NULL;
-    }
 
   if (is_ip6)
     {
@@ -1233,8 +1230,15 @@ grub_net_open_real (const char *name __attribute__ ((unused)))
   /*FIXME: Use DNS translate name to address */
   net_interface = match_route (server);
 
+  if (!net_interface && net_default_interface)
+    {
+      net_interface = net_default_interface;
+      grub_dprintf ("efinet", "interface lookup failed, using default '%s'\n",
+                    net_interface->name);
+    }
+
   /*XXX: should we check device with default gateway ? */
-  if (!net_interface && !(net_interface = net_default_interface))
+  if (!net_interface)
     {
       grub_error (GRUB_ERR_UNKNOWN_DEVICE, N_("disk `%s' no route found"),
 		  name);