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drm/i915/cmdparser: Use explicit goto for error paths

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In the next patch we will be adding a second valid
termination condition which will require a small
amount of refactoring to share logic with the BB_END
case.

Refactor all error conditions to jump to a dedicated
exit path, with 'break' reserved only for a successful
parse.

Cc: Tony Luck <tony.luck@intel.com>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Takashi Iwai <tiwai@suse.de>
Cc: Tyler Hicks <tyhicks@canonical.com>
Signed-off-by: Jon Bloomfield <jon.bloomfield@intel.com>
Reviewed-by: Chris Wilson <chris.p.wilson@intel.com>
This commit is contained in:
Jon Bloomfield 2018-09-27 10:23:17 -07:00
parent 0f2f397583
commit 0546a29cd8
1 changed files with 13 additions and 12 deletions
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25
drivers/gpu/drm/i915/i915_cmd_parser.c
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@ -1338,21 +1338,15 @@ int intel_engine_cmd_parser(struct intel_engine_cs *engine,
do {
u32 length;
if (*cmd == MI_BATCH_BUFFER_END) {
if (needs_clflush_after) {
void *ptr = page_mask_bits(shadow_batch_obj->mm.mapping);
drm_clflush_virt_range(ptr,
(void *)(cmd + 1) - ptr);
}
if (*cmd == MI_BATCH_BUFFER_END)
break;
}
desc = find_cmd(engine, *cmd, desc, &default_desc);
if (!desc) {
DRM_DEBUG_DRIVER("CMD: Unrecognized command: 0x%08X\n",
*cmd);
ret = -EINVAL;
break;
goto err;
}
/*
@ -1362,7 +1356,7 @@ int intel_engine_cmd_parser(struct intel_engine_cs *engine,
*/
if (desc->cmd.value == MI_BATCH_BUFFER_START) {
ret = -EACCES;
break;
goto err;
}
if (desc->flags & CMD_DESC_FIXED)
@ -1376,22 +1370,29 @@ int intel_engine_cmd_parser(struct intel_engine_cs *engine,
length,
batch_end - cmd);
ret = -EINVAL;
break;
goto err;
}
if (!check_cmd(engine, desc, cmd, length)) {
ret = -EACCES;
break;
goto err;
}
cmd += length;
if (cmd >= batch_end) {
DRM_DEBUG_DRIVER("CMD: Got to the end of the buffer w/o a BBE cmd!\n");
ret = -EINVAL;
break;
goto err;
}
} while (1);
if (needs_clflush_after) {
void *ptr = page_mask_bits(shadow_batch_obj->mm.mapping);
drm_clflush_virt_range(ptr, (void *)(cmd + 1) - ptr);
}
err:
i915_gem_object_unpin_map(shadow_batch_obj);
return ret;
}