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-frame... base: 4d00e2309398147acdbfefbe1deb4b0e78868466 config: x86_64-randconfig-m001-20210718 (attached as .config) compiler: gcc-10 (Ubuntu 10.3.0-1ubuntu1~20.04) 10.3.0
If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot lkp@intel.com
smatch warnings: drivers/gpu/drm/drm_gem_framebuffer_helper.c:192 drm_gem_fb_init_with_funcs() warn: always true condition '(i >= 0) => (0-u32max >= 0)' drivers/gpu/drm/drm_gem_framebuffer_helper.c:192 drm_gem_fb_init_with_funcs() warn: always true condition '(i >= 0) => (0-u32max >= 0)'
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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