target/linux/generic/backport-5.10/891-v5.13-net-dsa-mv88e6xxx-Fix-off-by-one-in-VTU-devlink-regi.patch

   1 From 281140a0a2ce4febf2c0ce5d29d0e7d961a826b1 Mon Sep 17 00:00:00 2001
   2 From: Tobias Waldekranz <tobias@waldekranz.com>
   3 Date: Wed, 21 Apr 2021 14:04:53 +0200
   4 Subject: [PATCH] net: dsa: mv88e6xxx: Fix off-by-one in VTU devlink region
   5  size
   6
   7 In the unlikely event of the VTU being loaded to the brim with 4k
   8 entries, the last one was placed in the buffer, but the size reported
   9 to devlink was off-by-one. Make sure that the final entry is available
  10 to the caller.
  11
  12 Fixes: ca4d632aef03 ("net: dsa: mv88e6xxx: Export VTU as devlink region")
  13 Signed-off-by: Tobias Waldekranz <tobias@waldekranz.com>
  14 Reviewed-by: Andrew Lunn <andrew@lunn.ch>
  15 Signed-off-by: David S. Miller <davem@davemloft.net>
  16 ---
  17  drivers/net/dsa/mv88e6xxx/devlink.c | 2 +-
  18  1 file changed, 1 insertion(+), 1 deletion(-)
  19
  20 --- a/drivers/net/dsa/mv88e6xxx/devlink.c
  21 +++ b/drivers/net/dsa/mv88e6xxx/devlink.c
  22 @@ -678,7 +678,7 @@ static int mv88e6xxx_setup_devlink_regio
  23                                 sizeof(struct mv88e6xxx_devlink_atu_entry);
  24                         break;
  25                 case MV88E6XXX_REGION_VTU:
  26 -                       size = mv88e6xxx_max_vid(chip) *
  27 +                       size = (mv88e6xxx_max_vid(chip) + 1) *
  28                                 sizeof(struct mv88e6xxx_devlink_vtu_entry);
  29                         break;
  30                 }