1. My Experiences as a Kernel ContributorBy
Arvind Yadav

2. AGENDA My Experience as a Beginner Snippets about other contributors
Every Bit Matters
My Contribution
Process Guidelines
Q&A

3. MY EXPERIENCES AS A BEGINNER
How it all started
How I got my first patch
Learnings from my failures

4. MY FIRST PATCH

5. SNIPPET ABOUT OTHER CONTRIBUTORS
His major contribution deals with Coverty tool generated issues
He has patches under his name
Gusto A R Silva

6. SNIPPET ABOUT OTHER CONTRIBUTORS
Her major contribution lies in the area of constify data operations and methods
She has gained patches under her name
Bhumika Goyal

7. Allen has contributed over 100+ patches in the current cycle
Allen Pais
Kees Cook
Both have contributed under ‘Convert timers to use timer_setup() and setup_timer()’
Allen has contributed over 100+ patches in the current cycle
Kees Cook has been one of the major contributors with patches under his name

8. SNIPPET ABOUT OTHER CONTRIBUTORS
Markus Elfring
His major contribution lies in the area of fixing checkpatch error and code cleanup
He has over patches under his name

9. EVERY BIT MATTERS The Typo that destroyed the NASA Rocket
Heart Bleed Error
AT&T Network Goes Down
Day of the dead living

10. MY CONTRIBUTIONS CONSTIFY DEVICE ID / ATTRIBUTE
ERROR HANDLING OR TAKING CARE OF RETURN VALUES
MEMORY / CLOCK RELEASES
CODE CLEANUP
COMPILATION WARNING
CHECKPATCH ERROR
BUG FIXING

11. CONSTIFY DEVICE ID / ATTRIBUTE

12. ERROR HANDLING OR TAKING CARE OF RETURN VALUES

13. MEMORY / CLOCK RELEASES

14. CODE CLEANUP

15. COMPILATION WARNING

16. CHECKPATCH ERROR

17. BUG FIXING
kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN Modules linked in: CPU: 1 PID: 1497 Comm: kworker/1:1 Not tainted rc g43a3f84d2109-dirty #380 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 Workqueue: usb_hub_wq hub_event task: ffff88006a5618c0 task.stack: ffff880068bc8000 RIP: 0010:imon_probe+0x231/0x3f10 drivers/media/rc/imon.c:2519 RSP: 0018:ffff880068bce2d8 EFLAGS: RAX: RBX: ffff dd500 RCX: RDX: dffffc RSI: RDI: RBP: ffff880068bce5e8 R08: ffff88006a5618c0 R09: ffffffff84b380fc R10: ffff880068bce2c8 R11: 1ffff1000d4ac5b3 R12: ffff R13: ffff R14: ffffffff883fa200 R15: ffffffff883fa080 FS:   (0000) GS:ffff88006c500000(0000) knlGS: CS:  0010 DS: 0000 ES: 0000 CR0: CR2: cbffc CR3: CR4: e0 Call Trace:  usb_probe_interface+0x35d/0x8e0 drivers/usb/core/driver.c:361  really_probe drivers/base/dd.c:413  driver_probe_device+0x610/0xa00 drivers/base/dd.c:557  __device_attach_driver+0x230/0x290 drivers/base/dd.c:653  bus_for_each_drv+0x161/0x210 drivers/base/bus.c:463  __device_attach+0x26e/0x3d0 drivers/base/dd.c:710  device_initial_probe+0x1f/0x30 drivers/base/dd.c:757  bus_probe_device+0x1eb/0x290 drivers/base/bus.c:523  device_add+0xd0b/0x1660 drivers/base/core.c:1835  usb_set_configuration+0x104e/0x1870 drivers/usb/core/message.c:1932  generic_probe+0x73/0xe0 drivers/usb/core/generic.c:174  usb_probe_device+0xaf/0xe0 drivers/usb/core/driver.c:266  really_probe drivers/base/dd.c:413  driver_probe_device+0x610/0xa00 drivers/base/dd.c:557  __device_attach_driver+0x230/0x290 drivers/base/dd.c:653  bus_for_each_drv+0x161/0x210 drivers/base/bus.c:463  __device_attach+0x26e/0x3d0 drivers/base/dd.c:710  device_initial_probe+0x1f/0x30 drivers/base/dd.c:757  bus_probe_device+0x1eb/0x290 drivers/base/bus.c:523  device_add+0xd0b/0x1660 drivers/base/core.c:1835  usb_new_device+0x7b8/0x1020 drivers/usb/core/hub.c:2457  hub_port_connect drivers/usb/core/hub.c:4903  hub_port_connect_change drivers/usb/core/hub.c:5009  port_event drivers/usb/core/hub.c:5115  hub_event+0x194d/0x3740 drivers/usb/core/hub.c:5195  process_one_work+0xc7f/0x1db0 kernel/workqueue.c:2119  worker_thread+0x221/0x1850 kernel/workqueue.c:2253  kthread+0x3a1/0x470 kernel/kthread.c:231  ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:431 Code: ff e8 a4 81 cb f df e8 2a cc 65 ff 0f ae f0 48 8d b ba fc ff df f9 48 c1 e9 03 <80> 3c f 85 e b f ae f0 44 RIP: imon_probe+0x231/0x3f10 RSP: ffff880068bce2d8 ---[ end trace 07febd2eebe02f84 ]---

18. BUG FIXING Contd
INFO: trying to register non-static key. the code is fine but needs lockdep annotation. turning off the locking correctness validator. CPU: 0 PID: 24 Comm: kworker/0:1 Not tainted rc gebb2c2437d80 #215 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 Workqueue: usb_hub_wq hub_event Call Trace:  __dump_stack lib/dump_stack.c:16  dump_stack+0x292/0x395 lib/dump_stack.c:52  register_lock_class+0x6c4/0x1a00 kernel/locking/lockdep.c:769  __lock_acquire+0x27e/0x4550 kernel/locking/lockdep.c:3385  lock_acquire+0x259/0x620 kernel/locking/lockdep.c:4002  flush_work+0xf0/0x8c0 kernel/workqueue.c:2886  hdpvr_probe+0x233/0x20d0 drivers/media/usb/hdpvr/hdpvr-core.c:400  usb_probe_interface+0x35d/0x8e0 drivers/usb/core/driver.c:361  really_probe drivers/base/dd.c:413  driver_probe_device+0x610/0xa00 drivers/base/dd.c:557  __device_attach_driver+0x230/0x290 drivers/base/dd.c:653  bus_for_each_drv+0x161/0x210 drivers/base/bus.c:463  __device_attach+0x26e/0x3d0 drivers/base/dd.c:710  device_initial_probe+0x1f/0x30 drivers/base/dd.c:757  bus_probe_device+0x1eb/0x290 drivers/base/bus.c:523  device_add+0xd0b/0x1660 drivers/base/core.c:1835  usb_set_configuration+0x104e/0x1870 drivers/usb/core/message.c:1932  generic_probe+0x73/0xe0 drivers/usb/core/generic.c:174  usb_probe_device+0xaf/0xe0 drivers/usb/core/driver.c:266  really_probe drivers/base/dd.c:413  driver_probe_device+0x610/0xa00 drivers/base/dd.c:557  __device_attach_driver+0x230/0x290 drivers/base/dd.c:653  bus_for_each_drv+0x161/0x210 drivers/base/bus.c:463  __device_attach+0x26e/0x3d0 drivers/base/dd.c:710  device_initial_probe+0x1f/0x30 drivers/base/dd.c:757  bus_probe_device+0x1eb/0x290 drivers/base/bus.c:523  device_add+0xd0b/0x1660 drivers/base/core.c:1835  usb_new_device+0x7b8/0x1020 drivers/usb/core/hub.c:2457  hub_port_connect drivers/usb/core/hub.c:4903  hub_port_connect_change drivers/usb/core/hub.c:5009  port_event drivers/usb/core/hub.c:5115  hub_event+0x194d/0x3740 drivers/usb/core/hub.c:5195  process_one_work+0xc7f/0x1db0 kernel/workqueue.c:2119  worker_thread+0x221/0x1850 kernel/workqueue.c:2253  kthread+0x3a1/0x470 kernel/kthread.c:231  ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:431 hdpvr: probe of 1-1:8.217 failed with error -12

19. PROCESS GUIDELINES Learn GIT Learn ‘how to build’ a module/kernel
Read the following documents several times
Documents/HowTo
Documents/CodingStyle
Use checkPatch.pl and getMaintainer.pl
Subject and Description should align the proper domain/ subsystem

20. Q&A

21. THANK YOU !!