target/linux/bcm27xx/patches-5.15/950-0881-Revert-fbdev-Hot-unplug-firmware-fb-devices-on-force.patch

   1 From 4899d3181465e16d548af03b7825c4b06e0f0e44 Mon Sep 17 00:00:00 2001
   2 From: Dom Cobley <popcornmix@gmail.com>
   3 Date: Thu, 28 Apr 2022 16:11:34 +0100
   4 Subject: [PATCH] Revert "fbdev: Hot-unplug firmware fb devices on
   5  forced removal"
   6
   7 This reverts commit c894ac44786cfed383a6c6b20c1bfb12eb96018a.
   8 ---
   9  drivers/video/fbdev/core/fbmem.c | 29 +++--------------------------
  10  include/linux/fb.h               |  1 -
  11  2 files changed, 3 insertions(+), 27 deletions(-)
  12
  13 --- a/drivers/video/fbdev/core/fbmem.c
  14 +++ b/drivers/video/fbdev/core/fbmem.c
  15 @@ -26,7 +26,6 @@
  16  #include <linux/init.h>
  17  #include <linux/linux_logo.h>
  18  #include <linux/proc_fs.h>
  19 -#include <linux/platform_device.h>
  20  #include <linux/seq_file.h>
  21  #include <linux/console.h>
  22  #include <linux/kmod.h>
  23 @@ -1608,36 +1607,18 @@ static void do_remove_conflicting_frameb
  24         /* check all firmware fbs and kick off if the base addr overlaps */
  25         for_each_registered_fb(i) {
  26                 struct apertures_struct *gen_aper;
  27 -               struct device *device;
  28
  29                 if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE))
  30                         continue;
  31
  32                 gen_aper = registered_fb[i]->apertures;
  33 -               device = registered_fb[i]->device;
  34                 if (fb_do_apertures_overlap(gen_aper, a) ||
  35                         (primary && gen_aper && gen_aper->count &&
  36                          gen_aper->ranges[0].base == VGA_FB_PHYS)) {
  37
  38                         printk(KERN_INFO "fb%d: switching to %s from %s\n",
  39                                i, name, registered_fb[i]->fix.id);
  40 -
  41 -                       /*
  42 -                        * If we kick-out a firmware driver, we also want to remove
  43 -                        * the underlying platform device, such as simple-framebuffer,
  44 -                        * VESA, EFI, etc. A native driver will then be able to
  45 -                        * allocate the memory range.
  46 -                        *
  47 -                        * If it's not a platform device, at least print a warning. A
  48 -                        * fix would add code to remove the device from the system.
  49 -                        */
  50 -                       if (dev_is_platform(device)) {
  51 -                               registered_fb[i]->forced_out = true;
  52 -                               platform_device_unregister(to_platform_device(device));
  53 -                       } else {
  54 -                               pr_warn("fb%d: cannot remove device\n", i);
  55 -                               do_unregister_framebuffer(registered_fb[i]);
  56 -                       }
  57 +                       do_unregister_framebuffer(registered_fb[i]);
  58                 }
  59         }
  60  }
  61 @@ -1975,13 +1956,9 @@ EXPORT_SYMBOL(register_framebuffer);
  62  void
  63  unregister_framebuffer(struct fb_info *fb_info)
  64  {
  65 -       bool forced_out = fb_info->forced_out;
  66 -
  67 -       if (!forced_out)
  68 -               mutex_lock(&registration_lock);
  69 +       mutex_lock(&registration_lock);
  70         do_unregister_framebuffer(fb_info);
  71 -       if (!forced_out)
  72 -               mutex_unlock(&registration_lock);
  73 +       mutex_unlock(&registration_lock);
  74  }
  75  EXPORT_SYMBOL(unregister_framebuffer);
  76
  77 --- a/include/linux/fb.h
  78 +++ b/include/linux/fb.h
  79 @@ -502,7 +502,6 @@ struct fb_info {
  80         } *apertures;
  81
  82         bool skip_vt_switch; /* no VT switch on suspend/resume required */
  83 -       bool forced_out; /* set when being removed by another driver */
  84  };
  85
  86  static inline struct apertures_struct *alloc_apertures(unsigned int max_num) {