Hello Eric Huang,
The patch 5632708f4452: "drm/amd/powerplay: add dpm force multiple
levels on cz/tonga/fiji/polaris (v2)" from Apr 12, 2016, leads to the
following static checker warning:
drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c:368 amdgpu_set_pp_dpm_sclk()
warn: why is the last element skipped?
drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
356 static ssize_t amdgpu_set_pp_dpm_sclk(struct device *dev,
357 struct device_attribute *attr,
358 const char *buf,
359 size_t count)
360 {
361 struct drm_device *ddev = dev_get_drvdata(dev);
362 struct amdgpu_device *adev = ddev->dev_private;
363 int ret;
364 long level;
365 uint32_t i, mask = 0;
366 char sub_str[2];
367
368 for (i = 0; i < strlen(buf) - 1; i++) {
strlen() returns the number of characters not counting the NUL
terminator. I guess this assumes that the last character is a newline?
Could we check for that instead?
369 sub_str[0] = *(buf + i);
370 sub_str[1] = '\0';
371 ret = kstrtol(sub_str, 0, &level);
372
373 if (ret) {
374 count = -EINVAL;
375 goto fail;
376 }
377 mask |= 1 << level;
378 }
379
380 if (adev->pp_enabled)
381 amdgpu_dpm_force_clock_level(adev, PP_SCLK, mask);
382 fail:
383 return count;
384 }
There are a couple other:
drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c:412 amdgpu_set_pp_dpm_mclk() warn: why is the last element skipped?
drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c:456 amdgpu_set_pp_dpm_pcie() warn: why is the last element skipped?
regards,
dan carpenter
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