Sample Code Maintenance

• Github repo

• Directory _morph holds my_driver.c, which is the base for livehacking sessions

• my_driver.c is morphed as we go

• Branch tree (not merged back)

  • Branch my_driver_hello

    Topic	Module Loading, Hello World
    Branch	my_driver_hello
    Contents	The root of everything Makefile, build Module loading, init(), exit().
    Status	DONE

  • Branch my_driver_cdev_manual

    Topic	Character Device Basics
    Branch	my_driver_cdev_manual
    Contents	History: static device numbers Character device basics
    Status	DONE

  • Branch my_driver_cdev_dynamic_major

    Topic	Modern Character Devices
    Branch	my_driver_cdev_dynamic_major
    Contents	Dynamic device number allocation devtmpfs and sysfs
    Status	…

  • Branch my_driver_cdev_file_operations

    Topic	File Operations on Character Devices
    Branch	my_driver_cdev_file_operations
    Contents	History: static device numbers Character device basics struct file_operations open() ioctl() and _IO*() macros
    Status	DONE

  • Branch my_driver_cdev_first_functionality

    Topic	Coding: First Functionality
    Branch	my_driver_cdev_first_functionality
    Contents	Doubly linked list Basic OO Simple ioctl Userspace ioctl usage
    Status	DONE

  • Branch my_driver_cdev_refactoring

    Topic	Coding: Refactoring
    Branch	my_driver_cdev_refactoring
    Contents	Separate files My Device encapsulation of matters My Device as filp->private_data
    Status	DONE

  • Branch my_driver_multiple_devices

    Topic	Coding: Multiple Devices
    Branch	my_driver_multiple_devices
    Contents	…
    Status	…

  • Branch my_driver_mutex

    Topic	Coding: Fix Race Condition (Mutex)
    Branch	my_driver_mutex
    Contents	Race on unprotected lists Mutex RT mutex “Interruptible”
    Status	DONE

  • Branch my_driver_interrupt

    Topic	Coding: Raspi GPIO Interrupts
    Branch	my_driver_interrupt
    Contents	Short GPIO introduction ⟶ move to Raspi Request and free IRQ Atomic?
    Status	DONE

  • Branch my_driver_spinlock_atomic.

    Topic	Coding: Fix Sleep While Atomic
    Branch	my_driver_spinlock_atomic
    Contents	Spinlock usage Spinlock caveats (sleep/atomic)
    Status	DONE

  • Branch my_driver_time_timer.

    Topic	Coding: Timed Event
    Branch	my_driver_time_timer
    Contents	jiffies Timer wheel methods
    Status	DONE

  • Branch my_driver_workqueue.

    Topic	Workqueue
    Branch	my_driver_workqueue
    Contents	Workqueue Getting rid of atomic code Realtime priorities
    Status	DONE

  • Branch my_driver_usermem.

    Topic	Accessing Userspace Memory
    Branch	my_driver_usermem
    Contents	copy_{to,from}_user()
    Status	DONE

  • Branch my_driver_waitqueue.

    Topic	Waiting for Something
    Branch	my_driver_waitqueue
    Contents	Wait queues Blocking vs. nonblocking read() EAGAIN and EOF
    Status	DONE