Web Reference: Allocates a range of char device numbers. The major number will be chosen dynamically, and returned (along with the first minor number) in dev. Returns zero or a negative error code. It is recommended that device identifiers be dynamically assigned to the alloc_chrdev_region function. Below sequence reserves my_minor_count devices, starting with my_major major and my_first_minor minor (if the max value for minor is exceeded, move to the next major): Mar 23, 2012 · In other words, your drivers should almost certainly be using alloc_chrdev_region rather than register_chrdev_region. The disadvantage of dynamic assignment is that you can't create the device nodes in advance, because the major number assigned to your module will vary.
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