recipes-kernel/sllin/files/0004-Fix-build-with-5.9-kernel.patch

   1 Use sched_set_fifo on newer kernels
   2
   3 The 5.9 kernel removed the export of sched_setscheduler, use
   4 the new sched_set_fifo API if building on 5.9 or newer.  There
   5 is a slight difference in resulting priority level, the new
   6 API will yield a priority of 50 instead of the explicit value
   7 of 40 being used with sched_setscheduler, but this should not
   8 be an issue.
   9
  10 Upstream-Status: Inappropriate [no upstream]
  11 Signed-off-by: Scott Murray <scott.murray@konsulko.com>
  12
  13 ---
  14 diff --git a/sllin/sllin.c b/sllin/sllin.c
  15 index 133d6e9..92c52ad 100644
  16 --- a/sllin/sllin.c
  17 +++ b/sllin/sllin.c
  18 @@ -1059,14 +1059,20 @@ static int sllin_kwthread(void *ptr)
  19  {
  20         struct sllin *sl = (struct sllin *)ptr;
  21         struct tty_struct *tty = sl->tty;
  22 +#if LINUX_VERSION_CODE < KERNEL_VERSION(5,9,0)
  23         struct sched_param schparam = { .sched_priority = 40 };
  24 +#endif
  25         int tx_bytes = 0; /* Used for Network statistics */
  26         unsigned long flags;
  27         int lin_id;
  28         struct sllin_conf_entry *sce;
  29
  30         netdev_dbg(sl->dev, "sllin_kwthread started.\n");
  31 +#if LINUX_VERSION_CODE < KERNEL_VERSION(5,9,0)
  32         sched_setscheduler(current, SCHED_FIFO, &schparam);
  33 +#else
  34 +       sched_set_fifo(current);
  35 +#endif
  36
  37         clear_bit(SLF_ERROR, &sl->flags);
  38         sltty_change_speed(tty, sl->lin_baud);
  39 @@ -1274,8 +1280,8 @@ slstate_response_wait:
  40                                         sl->lin_state = SLSTATE_RESPONSE_WAIT_BUS;
  41                                 }
  42                         }
  43 +                       fallthrough;
  44
  45 -                       /* Be aware, no BREAK here */
  46                 case SLSTATE_RESPONSE_WAIT_BUS:
  47                         if (sl->rx_cnt < sl->rx_expect)
  48                                 continue;