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libata: Clarify ata_set_lba_range_entries function

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ata_set_lba_range_entries used the variable max for two different things
which was confusing.  Make the function take a buffer size in bytes as
argument and return the used buffer size upon completion.

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Martin K. Petersen 2009-11-26 12:00:43 -05:00 committed by Jeff Garzik
parent e78db4dfb1
commit d0634c4aea
2 changed files with 11 additions and 11 deletions
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2
drivers/ata/libata-scsi.c
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@ -2972,7 +2972,7 @@ static unsigned int ata_scsi_write_same_xlat(struct ata_queued_cmd *qc)
goto invalid_fld;
buf = page_address(sg_page(scsi_sglist(scmd)));
size = ata_set_lba_range_entries(buf, 512 / 8, block, n_block);
size = ata_set_lba_range_entries(buf, 512, block, n_block);
tf->protocol = ATA_PROT_DMA;
tf->hob_feature = 0;

20
include/linux/ata.h
View File

@ -982,17 +982,17 @@ static inline void ata_id_to_hd_driveid(u16 *id)
}
/*
* Write up to 'max' LBA Range Entries to the buffer that will cover the
* extent from sector to sector + count. This is used for TRIM and for
* ADD LBA(S) TO NV CACHE PINNED SET.
* Write LBA Range Entries to the buffer that will cover the extent from
* sector to sector + count. This is used for TRIM and for ADD LBA(S)
* TO NV CACHE PINNED SET.
*/
static inline unsigned ata_set_lba_range_entries(void *_buffer, unsigned max,
u64 sector, unsigned long count)
static inline unsigned ata_set_lba_range_entries(void *_buffer,
unsigned buf_size, u64 sector, unsigned long count)
{
__le64 *buffer = _buffer;
unsigned i = 0;
unsigned i = 0, used_bytes;
while (i < max) {
while (i < buf_size / 8 ) { /* 6-byte LBA + 2-byte range per entry */
u64 entry = sector |
((u64)(count > 0xffff ? 0xffff : count) << 48);
buffer[i++] = __cpu_to_le64(entry);
@ -1002,9 +1002,9 @@ static inline unsigned ata_set_lba_range_entries(void *_buffer, unsigned max,
sector += 0xffff;
}
max = ALIGN(i * 8, 512);
memset(buffer + i, 0, max - i * 8);
return max;
used_bytes = ALIGN(i * 8, 512);
memset(buffer + i, 0, used_bytes - i * 8);
return used_bytes;
}
static inline int is_multi_taskfile(struct ata_taskfile *tf)