Hi Thomas,
I love your patch! Perhaps something to improve:
[auto build test WARNING on 4d00e2309398147acdbfefbe1deb4b0e78868466]
url:
https://github.com/0day-ci/linux/commits/Thomas-Zimmermann/drm-Provide-framebuffer-vmap-helpers/20210716-020508
base: 4d00e2309398147acdbfefbe1deb4b0e78868466
compiler: hppa-linux-gcc (GCC) 10.3.0
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>
cppcheck possible warnings: (new ones prefixed by >>, may not real problems)
drivers/gpu/drm/drm_gem_framebuffer_helper.c:192:14: warning: Unsigned variable 'i' can't be negative so it is unnecessary to test it. [unsignedPositive]
for (i--; i >= 0; i--)
^
vim +192 drivers/gpu/drm/drm_gem_framebuffer_helper.c
4c3dbb2c312c9f Noralf Trønnes 2017-08-13 119 4c3dbb2c312c9f
Noralf Trønnes 2017-08-13 120 /**
f2b816d78a9431 Andrzej Pietrasiewicz 2020-03-11 121 *
drm_gem_fb_init_with_funcs() - Helper function for implementing
4c3dbb2c312c9f Noralf Trønnes 2017-08-13 122 *
&drm_mode_config_funcs.fb_create
f2b816d78a9431 Andrzej Pietrasiewicz 2020-03-11 123 * callback
in cases when the driver
f2b816d78a9431 Andrzej Pietrasiewicz 2020-03-11 124 * allocates
a subclass of
f2b816d78a9431 Andrzej Pietrasiewicz 2020-03-11 125 * struct
drm_framebuffer
4c3dbb2c312c9f Noralf Trønnes 2017-08-13 126 * @dev: DRM device
f2b816d78a9431 Andrzej Pietrasiewicz 2020-03-11 127 * @fb:
framebuffer object
2e187b2099034a Noralf Trønnes 2017-09-22 128 * @file: DRM file
that holds the GEM handle(s) backing the framebuffer
2e187b2099034a Noralf Trønnes 2017-09-22 129 * @mode_cmd:
Metadata from the userspace framebuffer creation request
4c3dbb2c312c9f Noralf Trønnes 2017-08-13 130 * @funcs: vtable
to be used for the new framebuffer object
4c3dbb2c312c9f Noralf Trønnes 2017-08-13 131 *
dbd62e16fd53d3 Noralf Trønnes 2019-01-15 132 * This function
can be used to set &drm_framebuffer_funcs for drivers that need
dbd62e16fd53d3 Noralf Trønnes 2019-01-15 133 * custom
framebuffer callbacks. Use drm_gem_fb_create() if you don't need to
dbd62e16fd53d3 Noralf Trønnes 2019-01-15 134 * change
&drm_framebuffer_funcs. The function does buffer size validation.
f2b816d78a9431 Andrzej Pietrasiewicz 2020-03-11 135 * The buffer size
validation is for a general case, though, so users should
f2b816d78a9431 Andrzej Pietrasiewicz 2020-03-11 136 * pay attention
to the checks being appropriate for them or, at least,
f2b816d78a9431 Andrzej Pietrasiewicz 2020-03-11 137 * non-conflicting.
2e187b2099034a Noralf Trønnes 2017-09-22 138 *
2e187b2099034a Noralf Trønnes 2017-09-22 139 * Returns:
f2b816d78a9431 Andrzej Pietrasiewicz 2020-03-11 140 * Zero or a
negative error code.
4c3dbb2c312c9f Noralf Trønnes 2017-08-13 141 */
f2b816d78a9431 Andrzej Pietrasiewicz 2020-03-11 142 int
drm_gem_fb_init_with_funcs(struct drm_device *dev,
f2b816d78a9431 Andrzej Pietrasiewicz 2020-03-11 143 struct
drm_framebuffer *fb,
f2b816d78a9431 Andrzej Pietrasiewicz 2020-03-11 144 struct
drm_file *file,
4c3dbb2c312c9f Noralf Trønnes 2017-08-13 145 const
struct drm_mode_fb_cmd2 *mode_cmd,
4c3dbb2c312c9f Noralf Trønnes 2017-08-13 146 const
struct drm_framebuffer_funcs *funcs)
4c3dbb2c312c9f Noralf Trønnes 2017-08-13 147 {
4c3dbb2c312c9f Noralf Trønnes 2017-08-13 148 const struct
drm_format_info *info;
6065e7036e073e Thomas Zimmermann 2021-07-15 149 struct
drm_gem_object *objs[DRM_FORMAT_MAX_PLANES];
6065e7036e073e Thomas Zimmermann 2021-07-15 150 unsigned int i;
6065e7036e073e Thomas Zimmermann 2021-07-15 151 int ret;
4c3dbb2c312c9f Noralf Trønnes 2017-08-13 152 4c3dbb2c312c9f
Noralf Trønnes 2017-08-13 153 info = drm_get_format_info(dev,
mode_cmd);
f7f525030854b1 Simon Ser 2021-05-03 154 if (!info) {
f7f525030854b1 Simon Ser 2021-05-03 155 drm_dbg_kms(dev,
"Failed to get FB format info\n");
f2b816d78a9431 Andrzej Pietrasiewicz 2020-03-11 156 return -EINVAL;
f7f525030854b1 Simon Ser 2021-05-03 157 }
4c3dbb2c312c9f Noralf Trønnes 2017-08-13 158 4c3dbb2c312c9f
Noralf Trønnes 2017-08-13 159 for (i = 0; i <
info->num_planes; i++) {
4c3dbb2c312c9f Noralf Trønnes 2017-08-13 160 unsigned int
width = mode_cmd->width / (i ? info->hsub : 1);
4c3dbb2c312c9f Noralf Trønnes 2017-08-13 161 unsigned int
height = mode_cmd->height / (i ? info->vsub : 1);
4c3dbb2c312c9f Noralf Trønnes 2017-08-13 162 unsigned int
min_size;
4c3dbb2c312c9f Noralf Trønnes 2017-08-13 163 4c3dbb2c312c9f
Noralf Trønnes 2017-08-13 164 objs[i] =
drm_gem_object_lookup(file, mode_cmd->handles[i]);
4c3dbb2c312c9f Noralf Trønnes 2017-08-13 165 if (!objs[i]) {
24f03be4aa7922 Jani Nikula 2019-12-10 166
drm_dbg_kms(dev, "Failed to lookup GEM object\n");
4c3dbb2c312c9f Noralf Trønnes 2017-08-13 167 ret = -ENOENT;
4c3dbb2c312c9f Noralf Trønnes 2017-08-13 168 goto
err_gem_object_put;
4c3dbb2c312c9f Noralf Trønnes 2017-08-13 169 }
4c3dbb2c312c9f Noralf Trønnes 2017-08-13 170 4c3dbb2c312c9f
Noralf Trønnes 2017-08-13 171 min_size = (height - 1) *
mode_cmd->pitches[i]
042bf753842ddb Alexandru Gheorghe 2018-11-01 172 +
drm_format_info_min_pitch(info, i, width)
4c3dbb2c312c9f Noralf Trønnes 2017-08-13 173 +
mode_cmd->offsets[i];
4c3dbb2c312c9f Noralf Trønnes 2017-08-13 174 4c3dbb2c312c9f
Noralf Trønnes 2017-08-13 175 if (objs[i]->size < min_size) {
f7f525030854b1 Simon Ser 2021-05-03 176 drm_dbg_kms(dev,
f7f525030854b1 Simon Ser 2021-05-03 177 "GEM
object size (%zu) smaller than minimum size (%u) for plane %d\n",
f7f525030854b1 Simon Ser 2021-05-03 178
objs[i]->size, min_size, i);
be6ee102341bc4 Emil Velikov 2020-05-15 179
drm_gem_object_put(objs[i]);
4c3dbb2c312c9f Noralf Trønnes 2017-08-13 180 ret = -EINVAL;
4c3dbb2c312c9f Noralf Trønnes 2017-08-13 181 goto
err_gem_object_put;
4c3dbb2c312c9f Noralf Trønnes 2017-08-13 182 }
4c3dbb2c312c9f Noralf Trønnes 2017-08-13 183 }
4c3dbb2c312c9f Noralf Trønnes 2017-08-13 184 f2b816d78a9431
Andrzej Pietrasiewicz 2020-03-11 185 ret = drm_gem_fb_init(dev, fb,
mode_cmd, objs, i, funcs);
f2b816d78a9431 Andrzej Pietrasiewicz 2020-03-11 186 if (ret)
4c3dbb2c312c9f Noralf Trønnes 2017-08-13 187 goto
err_gem_object_put;
4c3dbb2c312c9f Noralf Trønnes 2017-08-13 188 f2b816d78a9431
Andrzej Pietrasiewicz 2020-03-11 189 return 0;
4c3dbb2c312c9f Noralf Trønnes 2017-08-13 190 4c3dbb2c312c9f
Noralf Trønnes 2017-08-13 191 err_gem_object_put:
4c3dbb2c312c9f Noralf Trønnes 2017-08-13 @192 for (i--; i >= 0;
i--)
be6ee102341bc4 Emil Velikov 2020-05-15 193
drm_gem_object_put(objs[i]);
4c3dbb2c312c9f Noralf Trønnes 2017-08-13 194 f2b816d78a9431
Andrzej Pietrasiewicz 2020-03-11 195 return ret;
f2b816d78a9431 Andrzej Pietrasiewicz 2020-03-11 196 }
f2b816d78a9431 Andrzej Pietrasiewicz 2020-03-11 197
EXPORT_SYMBOL_GPL(drm_gem_fb_init_with_funcs);
f2b816d78a9431 Andrzej Pietrasiewicz 2020-03-11 198
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0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
