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mm/iob/iob_copyin.c: iob_copyin() should wait for each buffer and adjust the return value of iob_copyin_internal return to simplify the code

This commit is contained in:
Xiang Xiao 2019-01-26 10:48:47 -06:00 committed by Gregory Nutt
parent 2671709e62
commit b6606e61b4
1 changed files with 8 additions and 30 deletions
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38
mm/iob/iob_copyin.c
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@ -49,20 +49,6 @@
#include "iob.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#ifndef MIN
# define MIN(a,b) ((a) < (b) ? (a) : (b))
#endif
/****************************************************************************
* Private Types
****************************************************************************/
typedef CODE struct iob_s *(*iob_alloc_t)(bool throttled);
/****************************************************************************
* Public Functions
****************************************************************************/
@ -198,23 +184,22 @@ static int iob_copyin_internal(FAR struct iob_s *iob, FAR const uint8_t *src,
{
/* Yes.. allocate a new buffer.
*
* Copy as many bytes as possible. If we have successfully copied
* any already don't block, otherwise block if we're allowed.
* Copy as many bytes as possible. Block if we're allowed.
*/
if (!can_block || len < total)
if (can_block)
{
next = iob_tryalloc(throttled);
next = iob_alloc(throttled);
}
else
{
next = iob_alloc(throttled);
next = iob_tryalloc(throttled);
}
if (next == NULL)
{
ioberr("ERROR: Failed to allocate I/O buffer\n");
return len;
return -ENOMEM;
}
/* Add the new, empty I/O buffer to the end of the buffer chain. */
@ -227,7 +212,7 @@ static int iob_copyin_internal(FAR struct iob_s *iob, FAR const uint8_t *src,
offset = 0;
}
return 0;
return total;
}
/****************************************************************************
@ -246,7 +231,7 @@ static int iob_copyin_internal(FAR struct iob_s *iob, FAR const uint8_t *src,
int iob_copyin(FAR struct iob_s *iob, FAR const uint8_t *src,
unsigned int len, unsigned int offset, bool throttled)
{
return len - iob_copyin_internal(iob, src, len, offset, throttled, true);
return iob_copyin_internal(iob, src, len, offset, throttled, true);
}
/****************************************************************************
@ -262,12 +247,5 @@ int iob_copyin(FAR struct iob_s *iob, FAR const uint8_t *src,
int iob_trycopyin(FAR struct iob_s *iob, FAR const uint8_t *src,
unsigned int len, unsigned int offset, bool throttled)
{
if (iob_copyin_internal(iob, src, len, offset, throttled, false) == 0)
{
return len;
}
else
{
return -ENOMEM;
}
return iob_copyin_internal(iob, src, len, offset, throttled, false);
}