target/linux/generic/backport-5.15/790-v6.4-0001-net-dsa-mt7530-make-some-noise-if-register-read-fail.patch

   1 From b6f56cddb5f57a0b8da0ce582232a2f1933558c6 Mon Sep 17 00:00:00 2001
   2 From: Daniel Golle <daniel@makrotopia.org>
   3 Date: Mon, 3 Apr 2023 02:17:19 +0100
   4 Subject: [PATCH 04/16] net: dsa: mt7530: make some noise if register read
   5  fails
   6
   7 Simply returning the negative error value instead of the read value
   8 doesn't seem like a good idea. Return 0 instead and add WARN_ON_ONCE(1)
   9 so this kind of error will not go unnoticed.
  10
  11 Suggested-by: Andrew Lunn <andrew@lunn.ch>
  12 Signed-off-by: Daniel Golle <daniel@makrotopia.org>
  13 Reviewed-by: Andrew Lunn <andrew@lunn.ch>
  14 Signed-off-by: David S. Miller <davem@davemloft.net>
  15 ---
  16  drivers/net/dsa/mt7530.c | 3 ++-
  17  1 file changed, 2 insertions(+), 1 deletion(-)
  18
  19 --- a/drivers/net/dsa/mt7530.c
  20 +++ b/drivers/net/dsa/mt7530.c
  21 @@ -224,9 +224,10 @@ mt7530_mii_read(struct mt7530_priv *priv
  22         /* MT7530 uses 31 as the pseudo port */
  23         ret = bus->write(bus, 0x1f, 0x1f, page);
  24         if (ret < 0) {
  25 +               WARN_ON_ONCE(1);
  26                 dev_err(&bus->dev,
  27                         "failed to read mt7530 register\n");
  28 -               return ret;
  29 +               return 0;
  30         }
  31
  32         lo = bus->read(bus, 0x1f, r);