target/linux/generic/backport-5.4/723-v5.5-net-sfp-handle-module-remove-outside-state-machine.patch

   1 From d2591ea5520e2ee8fa557f96bb64c23cafac4b20 Mon Sep 17 00:00:00 2001
   2 From: Russell King <rmk+kernel@armlinux.org.uk>
   3 Date: Tue, 15 Oct 2019 10:33:13 +0100
   4 Subject: [PATCH 621/660] net: sfp: handle module remove outside state machine
   5
   6 Removing a module resets the module state machine back to its initial
   7 state.  Rather than explicitly handling this in every state, handle it
   8 early on outside of the state machine.
   9
  10 Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
  11 ---
  12  drivers/net/phy/sfp.c | 16 +++++++++-------
  13  1 file changed, 9 insertions(+), 7 deletions(-)
  14
  15 --- a/drivers/net/phy/sfp.c
  16 +++ b/drivers/net/phy/sfp.c
  17 @@ -1500,6 +1500,14 @@ static void sfp_sm_device(struct sfp *sf
  18   */
  19  static void sfp_sm_module(struct sfp *sfp, unsigned int event)
  20  {
  21 +       /* Handle remove event globally, it resets this state machine */
  22 +       if (event == SFP_E_REMOVE) {
  23 +               if (sfp->sm_mod_state > SFP_MOD_PROBE)
  24 +                       sfp_sm_mod_remove(sfp);
  25 +               sfp_sm_mod_next(sfp, SFP_MOD_EMPTY, 0);
  26 +               return;
  27 +       }
  28 +
  29         switch (sfp->sm_mod_state) {
  30         default:
  31                 if (event == SFP_E_INSERT && sfp->attached) {
  32 @@ -1509,9 +1517,7 @@ static void sfp_sm_module(struct sfp *sf
  33                 break;
  34
  35         case SFP_MOD_PROBE:
  36 -               if (event == SFP_E_REMOVE) {
  37 -                       sfp_sm_mod_next(sfp, SFP_MOD_EMPTY, 0);
  38 -               } else if (event == SFP_E_TIMEOUT) {
  39 +               if (event == SFP_E_TIMEOUT) {
  40                         int val = sfp_sm_mod_probe(sfp);
  41
  42                         if (val == 0)
  43 @@ -1533,10 +1539,6 @@ static void sfp_sm_module(struct sfp *sf
  44                 /* fallthrough */
  45         case SFP_MOD_PRESENT:
  46         case SFP_MOD_ERROR:
  47 -               if (event == SFP_E_REMOVE) {
  48 -                       sfp_sm_mod_remove(sfp);
  49 -                       sfp_sm_mod_next(sfp, SFP_MOD_EMPTY, 0);
  50 -               }
  51                 break;
  52         }
  53  }