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authorMartin K. Petersen <martin.petersen@oracle.com>2009-11-26 12:00:43 -0500
committerJeff Garzik <jgarzik@redhat.com>2009-12-03 18:01:23 -0500
commitd0634c4aea0b80447cbdc4c0db285004b860c455 (patch)
tree5d723e58b0feb11d049b7398e4c3f4600be01d9c /include/linux/ata.h
parente78db4dfb1355a895f7ea50133b702b55b8ed184 (diff)
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libata: Clarify ata_set_lba_range_entries function
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>
Diffstat (limited to 'include/linux/ata.h')
-rw-r--r--include/linux/ata.h20
1 files changed, 10 insertions, 10 deletions
diff --git a/include/linux/ata.h b/include/linux/ata.h
index dfa2298bf48..38a6948ce0c 100644
--- a/include/linux/ata.h
+++ b/include/linux/ata.h
@@ -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)