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Feature #5899

open

152: Correct usage of IO memory mappings

Added by Vadim Mutilin over 9 years ago. Updated over 9 years ago.

Status:
Open
Priority:
Normal
Assignee:
-
Start date:
05/06/2015
Due date:
% Done:

0%

Estimated time:
Published in build:

Description

Summary

The module should not remove mappings which were not previously created.
The module should not recreate a mapping and should not remove already removed mapping.

At the end the module should remove all previously created mappings.

Description
An IO memory mapping is created with the help of static inline void *ioremap(phys_addr_t, unsigned long) and void *ioremap_cache(resource_size_t, unsigned long) (on x86 architecture) or static inline void *ioremap_cache(unsigned long, unsigned long) (on Xtensa or IA-64) or static inline void *ioremap_cache(phys_addr_t, unsigned long) (on SuperH) and with architecture dependent macro or ioremap_nocache and ioremap_wc.

IO memory mappings are removed with static inline void iounmap(volatile void *).

Links
Sample bugfix 57cbe30

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