141 int new_min = baseminor;

142 int new_max = baseminor + minorct - 1;

143

144 /* New driver overlaps from the left. */

145 if (new_max >= old_min && new_max <= old_max) {

146 ret = -EBUSY;

147 goto out;

148 }

149

150 /* New driver overlaps from the right. */

151 if (new_min <= old_max && new_min >= old_min) {

152 ret = -EBUSY;

153 goto out;

154 }

155 }

156

157 cd->next = *cp;

158 *cp = cd;

159 mutex_unlock(&chrdevs_lock);

160 return cd;

161out:

162 mutex_unlock(&chrdevs_lock);

163 kfree(cd);

164 return ERR_PTR(ret);

165}