Hello Oscar Salvador,
The patch bfb96e4c344e: "drm/nouveau/hwmon: Remove old code, add
.write/.read operations" from May 18, 2017, leads to the following
static checker warning:
drivers/gpu/drm/nouveau/nouveau_hwmon.c:507 nouveau_in_read()
warn: check sign expansion for '-19'
drivers/gpu/drm/nouveau/nouveau_hwmon.c:510 nouveau_in_read()
warn: check sign expansion for '-19'
drivers/gpu/drm/nouveau/nouveau_hwmon.c
488 static int
489 nouveau_in_read(struct device *dev, u32 attr, int channel, long *val)
490 {
491 struct drm_device *drm_dev = dev_get_drvdata(dev);
492 struct nouveau_drm *drm = nouveau_drm(drm_dev);
493 struct nvkm_volt *volt = nvxx_volt(&drm->client.device);
494 int ret;
495
496 if (!volt)
497 return -EOPNOTSUPP;
498
499 switch (attr) {
500 case hwmon_in_input:
501 if (drm_dev->switch_power_state != DRM_SWITCH_POWER_ON)
502 return -EINVAL;
503 ret = nvkm_volt_get(volt);
504 *val = ret < 0 ? ret : (ret / 1000);
505 break;
506 case hwmon_in_min:
507 *val = volt->min_uv > 0 ? (volt->min_uv / 1000) : -ENODEV;
This is trying to set "*val = -ENODEV" but because "volt->min_uv" is
unsigned int it actually sets it to "*val = (unsigned int)-ENODEV".
It's weird to me that this code doesn't return -ENODEV instead of
setting *val to it.
508 break;
509 case hwmon_in_max:
510 *val = volt->max_uv > 0 ? (volt->max_uv / 1000) : -ENODEV;
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
511 break;
512 default:
513 return -EOPNOTSUPP;
514 }
515
516 return 0;
517 }
regards,
dan carpenter
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