static int ps3stor_probe_access()

in ps3stor_lib.c [75:126]

• 43 lines of code
• 6 McCabe index (conditional complexity)

static int ps3stor_probe_access(struct ps3_storage_device *dev)
{
	int res, error;
	unsigned int i;
	unsigned long n;

	if (dev->sbd.match_id == PS3_MATCH_ID_STOR_ROM) {
		/* special case: CD-ROM is assumed always accessible */
		dev->accessible_regions = 1;
		return 0;
	}

	error = -EPERM;
	for (i = 0; i < dev->num_regions; i++) {
		dev_dbg(&dev->sbd.core,
			"%s:%u: checking accessibility of region %u\n",
			__func__, __LINE__, i);

		dev->region_idx = i;
		res = ps3stor_read_write_sectors(dev, dev->bounce_lpar, 0, 1,
						 0);
		if (res) {
			dev_dbg(&dev->sbd.core, "%s:%u: read failed, "
				"region %u is not accessible\n", __func__,
				__LINE__, i);
			continue;
		}

		dev_dbg(&dev->sbd.core, "%s:%u: region %u is accessible\n",
			__func__, __LINE__, i);
		set_bit(i, &dev->accessible_regions);

		/* We can access at least one region */
		error = 0;
	}
	if (error)
		return error;

	n = hweight_long(dev->accessible_regions);
	if (n > 1)
		dev_info(&dev->sbd.core,
			 "%s:%u: %lu accessible regions found. Only the first "
			 "one will be used\n",
			 __func__, __LINE__, n);
	dev->region_idx = __ffs(dev->accessible_regions);
	dev_info(&dev->sbd.core,
		 "First accessible region has index %u start %llu size %llu\n",
		 dev->region_idx, dev->regions[dev->region_idx].start,
		 dev->regions[dev->region_idx].size);

	return 0;
}