ssize_t ssb_attr_sprom_store()

in sprom.c [99:147]

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

ssize_t ssb_attr_sprom_store(struct ssb_bus *bus,
			     const char *buf, size_t count,
			     int (*sprom_check_crc)(const u16 *sprom, size_t size),
			     int (*sprom_write)(struct ssb_bus *bus, const u16 *sprom))
{
	u16 *sprom;
	int res = 0, err = -ENOMEM;
	size_t sprom_size_words = bus->sprom_size;
	struct ssb_freeze_context freeze;

	sprom = kcalloc(bus->sprom_size, sizeof(u16), GFP_KERNEL);
	if (!sprom)
		goto out;
	err = hex2sprom(sprom, buf, count, sprom_size_words);
	if (err) {
		err = -EINVAL;
		goto out_kfree;
	}
	err = sprom_check_crc(sprom, sprom_size_words);
	if (err) {
		err = -EINVAL;
		goto out_kfree;
	}

	/* Use interruptible locking, as the SPROM write might
	 * be holding the lock for several seconds. So allow userspace
	 * to cancel operation.
	 */
	err = -ERESTARTSYS;
	if (mutex_lock_interruptible(&bus->sprom_mutex))
		goto out_kfree;
	err = ssb_devices_freeze(bus, &freeze);
	if (err) {
		pr_err("SPROM write: Could not freeze all devices\n");
		goto out_unlock;
	}
	res = sprom_write(bus, sprom);
	err = ssb_devices_thaw(&freeze);
	if (err)
		pr_err("SPROM write: Could not thaw all devices\n");
out_unlock:
	mutex_unlock(&bus->sprom_mutex);
out_kfree:
	kfree(sprom);
out:
	if (res)
		return res;
	return err ? err : count;
}