target/linux/bcm27xx/patches-5.4/950-0481-drm-modes-parse_cmdline-Stop-parsing-extras-after-bp.patch

   1 From 0e7c5e80d8d310a881d723a426762e8822d5bf35 Mon Sep 17 00:00:00 2001
   2 From: Hans de Goede <hdegoede@redhat.com>
   3 Date: Mon, 18 Nov 2019 16:51:24 +0100
   4 Subject: [PATCH] drm/modes: parse_cmdline: Stop parsing extras after
   5  bpp / refresh at ', '
   6
   7 Commit c2ed3e941901810ad3d55ce1935fa22c5007fee4 upstream.
   8
   9 Before this commit it was impossible to add an extra mode argument after
  10 a bpp or refresh specifier, combined with an option, e.g.
  11 video=HDMI-1:720x480-24e,rotate=180 would not work, either the "e" to
  12 force enable would need to be dropped or the ",rotate=180", otherwise
  13 the mode_option would not be accepted.
  14
  15 This commit fixes this by fixing the length calculation if extras_ptr
  16 is set to stop the extra parsing at the start of the options (stop at the
  17 ',' options_ptr points to).
  18
  19 Acked-by: Maxime Ripard <mripard@kernel.org>
  20 Signed-off-by: Hans de Goede <hdegoede@redhat.com>
  21 Link: https://patchwork.freedesktop.org/patch/msgid/20191118155134.30468-3-hdegoede@redhat.com
  22 ---
  23  drivers/gpu/drm/drm_modes.c                   | 10 ++++---
  24  .../gpu/drm/selftests/drm_cmdline_selftests.h |  1 +
  25  .../drm/selftests/test-drm_cmdline_parser.c   | 26 +++++++++++++++++++
  26  3 files changed, 33 insertions(+), 4 deletions(-)
  27
  28 --- a/drivers/gpu/drm/drm_modes.c
  29 +++ b/drivers/gpu/drm/drm_modes.c
  30 @@ -1728,7 +1728,7 @@ bool drm_mode_parse_command_line_for_con
  31         const char *bpp_ptr = NULL, *refresh_ptr = NULL, *extra_ptr = NULL;
  32         const char *options_ptr = NULL;
  33         char *bpp_end_ptr = NULL, *refresh_end_ptr = NULL;
  34 -       int ret;
  35 +       int i, len, ret;
  36
  37  #ifdef CONFIG_FB
  38         if (!mode_option)
  39 @@ -1848,9 +1848,11 @@ bool drm_mode_parse_command_line_for_con
  40         else if (refresh_ptr)
  41                 extra_ptr = refresh_end_ptr;
  42
  43 -       if (extra_ptr &&
  44 -           extra_ptr != options_ptr) {
  45 -               int len = strlen(name) - (extra_ptr - name);
  46 +       if (extra_ptr) {
  47 +               if (options_ptr)
  48 +                       len = options_ptr - extra_ptr;
  49 +               else
  50 +                       len = strlen(extra_ptr);
  51
  52                 ret = drm_mode_parse_cmdline_extra(extra_ptr, len, false,
  53                                                    connector, mode);
  54 --- a/drivers/gpu/drm/selftests/drm_cmdline_selftests.h
  55 +++ b/drivers/gpu/drm/selftests/drm_cmdline_selftests.h
  56 @@ -61,3 +61,4 @@ cmdline_test(drm_cmdline_test_vmirror)
  57  cmdline_test(drm_cmdline_test_margin_options)
  58  cmdline_test(drm_cmdline_test_multiple_options)
  59  cmdline_test(drm_cmdline_test_invalid_option)
  60 +cmdline_test(drm_cmdline_test_bpp_extra_and_option)
  61 --- a/drivers/gpu/drm/selftests/test-drm_cmdline_parser.c
  62 +++ b/drivers/gpu/drm/selftests/test-drm_cmdline_parser.c
  63 @@ -1003,6 +1003,32 @@ static int drm_cmdline_test_invalid_opti
  64         return 0;
  65  }
  66
  67 +static int drm_cmdline_test_bpp_extra_and_option(void *ignored)
  68 +{
  69 +       struct drm_cmdline_mode mode = { };
  70 +
  71 +       FAIL_ON(!drm_mode_parse_command_line_for_connector("720x480-24e,rotate=180",
  72 +                                                          &no_connector,
  73 +                                                          &mode));
  74 +       FAIL_ON(!mode.specified);
  75 +       FAIL_ON(mode.xres != 720);
  76 +       FAIL_ON(mode.yres != 480);
  77 +       FAIL_ON(mode.rotation_reflection != DRM_MODE_ROTATE_180);
  78 +
  79 +       FAIL_ON(mode.refresh_specified);
  80 +
  81 +       FAIL_ON(!mode.bpp_specified);
  82 +       FAIL_ON(mode.bpp != 24);
  83 +
  84 +       FAIL_ON(mode.rb);
  85 +       FAIL_ON(mode.cvt);
  86 +       FAIL_ON(mode.interlace);
  87 +       FAIL_ON(mode.margins);
  88 +       FAIL_ON(mode.force != DRM_FORCE_ON);
  89 +
  90 +       return 0;
  91 +}
  92 +
  93  #include "drm_selftest.c"
  94
  95  static int __init test_drm_cmdline_init(void)