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IO Framework: use standard errno codes as return values

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This patch redefines the values of IO_FAIL, IO_NOT_SUPPORTED and
IO_RESOURCES_EXHAUSTED to match the corresponding definitions in
errno.h:

    #define IO_FAIL                     (-ENOENT)
    #define IO_NOT_SUPPORTED            (-ENODEV)
    #define IO_RESOURCES_EXHAUSTED      (-ENOMEM)

NOTE: please note that the IO_FAIL, IO_NOT_SUPPORTED and
IO_RESOURCES_EXHAUSTED definitions are considered deprecated
and their usage should be avoided. Callers should rely on errno.h
definitions when checking the return values of IO functions.

Change-Id: Ic8491aa43384b6ee44951ebfc053a3ded16a80be
This commit is contained in:
Juan Castillo 2015-10-01 17:55:11 +01:00 committed by Juan Castillo
parent 84ab33e1e9
commit 7e26fe1f05
2 changed files with 9 additions and 7 deletions
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5
docs/porting-guide.md
View File

@ -358,13 +358,12 @@ must also be defined:
Defines the maximum number of registered IO devices. Attempting to register
more devices than this value using `io_register_device()` will fail with
IO_RESOURCES_EXHAUSTED.
-ENOMEM.
* **#define : MAX_IO_HANDLES**
Defines the maximum number of open IO handles. Attempting to open more IO
entities than this value using `io_open()` will fail with
IO_RESOURCES_EXHAUSTED.
entities than this value using `io_open()` will fail with -ENOMEM.
If the platform needs to allocate data within the per-cpu data framework in
BL3-1, it should define the following macro. Currently this is only required if

11
include/drivers/io/io_storage.h
View File

@ -31,6 +31,7 @@
#ifndef __IO_H__
#define __IO_H__
#include <errno.h>
#include <stdint.h>
#include <stdio.h> /* For ssize_t */
#include <uuid.h>
@ -88,11 +89,13 @@ typedef struct io_block_spec {
#define IO_MODE_RW (1 << 1)
/* Return codes reported by 'io_*' APIs */
/* Return codes reported by 'io_*' APIs.
* IMPORTANT: these definitions are deprecated. Callers should use standard
* errno definitions when checking the return value of io_* APIs. */
#define IO_SUCCESS (0)
#define IO_FAIL (-1)
#define IO_NOT_SUPPORTED (-2)
#define IO_RESOURCES_EXHAUSTED (-3)
#define IO_FAIL (-ENOENT)
#define IO_NOT_SUPPORTED (-ENODEV)
#define IO_RESOURCES_EXHAUSTED (-ENOMEM)
/* Open a connection to a device */