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Book Note: Linux Device Driver Dos and Don'ts

Book Note: Linux Device Driver Dos and Don'ts
http://janitor.kernelnewbies.org/docs/driver-howto.html
what a hardened (robust) device
driver should mean and how it should be implemented and measured.
1.3 Robust device drivers
-Follows the Linux CodingStyle.
-Efficient in managing faults and handling, reporting and recovering from errors.
 (Also not panic() happy.)
-Complies with latest Linux kernel APIs and interfaces.
 (Uses the new device driver model, kobjects and sysfs.)
-Properly manages resources (memory, semaphores, interrupts, etc.).
-Uses kernel-provided "C" I/O functions instead of assembly code.
2.0 Where do I start?
3.0 OK, I'm ready...
3.1 Efficient error handling, reporting and recovery:
1)<printk()>
you should always check printk() calls to include appropriate KERN_* constant.
2)<goto>
3) <Enumerated return codes> <return EWHATEVER should be return -EWHATEVER>
4) <No need to panic()>
Rather, the device ......

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