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authorAkinobu Mita <akinobu.mita@gmail.com>2013-06-29 12:59:18 +0400
committerJames Bottomley <JBottomley@Parallels.com>2013-07-09 12:25:35 +0400
commite18d8bea33077d259cc826c6d3fa76d36af61876 (patch)
tree6857a4ca1f8f3a0b9cd8054f7c3d976115bf8c49 /drivers/scsi/scsi_debug.c
parente9926b4376544d5a2dc4d310d4d0006c634b1a93 (diff)
downloadlinux-e18d8bea33077d259cc826c6d3fa76d36af61876.tar.xz
[SCSI] scsi_debug: simplify offset calculation for dif_storep
dif_storep is declared as pointer to unsigned char type. But it is actually used to store vmalloced array of struct sd_dif_tuple. This changes the type of dif_storep to the pointer to struct sd_dif_tuple. It simplifies offset calculation for dif_storep and enables to remove hardcoded size of struct sd_dif_tuple. Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Acked-by: Douglas Gilbert <dgilbert@interlog.com> Acked-by: "Martin K. Petersen" <martin.petersen@oracle.com> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Diffstat (limited to 'drivers/scsi/scsi_debug.c')
-rw-r--r--drivers/scsi/scsi_debug.c18
1 files changed, 7 insertions, 11 deletions
diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index 83efec2919b1..fc8b3aa083d4 100644
--- a/drivers/scsi/scsi_debug.c
+++ b/drivers/scsi/scsi_debug.c
@@ -258,7 +258,7 @@ struct sdebug_queued_cmd {
static struct sdebug_queued_cmd queued_arr[SCSI_DEBUG_CANQUEUE];
static unsigned char * fake_storep; /* ramdisk storage */
-static unsigned char *dif_storep; /* protection info */
+static struct sd_dif_tuple *dif_storep; /* protection info */
static void *map_storep; /* provisioning map */
static unsigned long map_size;
@@ -277,11 +277,6 @@ static char sdebug_proc_name[] = "scsi_debug";
static struct bus_type pseudo_lld_bus;
-static inline sector_t dif_offset(sector_t sector)
-{
- return sector << 3;
-}
-
static struct device_driver sdebug_driverfs_driver = {
.name = sdebug_proc_name,
.bus = &pseudo_lld_bus,
@@ -1727,7 +1722,7 @@ static int prot_verify_read(struct scsi_cmnd *SCpnt, sector_t start_sec,
start_sec = do_div(tmp_sec, sdebug_store_sectors);
- sdt = (struct sd_dif_tuple *)(dif_storep + dif_offset(start_sec));
+ sdt = dif_storep + start_sec;
for (i = 0 ; i < sectors ; i++) {
u16 csum;
@@ -1782,16 +1777,17 @@ static int prot_verify_read(struct scsi_cmnd *SCpnt, sector_t start_sec,
ei_lba++;
}
- resid = sectors * 8; /* Bytes of protection data to copy into sgl */
+ /* Bytes of protection data to copy into sgl */
+ resid = sectors * sizeof(*dif_storep);
sector = start_sec;
scsi_for_each_prot_sg(SCpnt, psgl, scsi_prot_sg_count(SCpnt), i) {
int len = min(psgl->length, resid);
paddr = kmap_atomic(sg_page(psgl)) + psgl->offset;
- memcpy(paddr, dif_storep + dif_offset(sector), len);
+ memcpy(paddr, dif_storep + sector, len);
- sector += len >> 3;
+ sector += len / sizeof(*dif_storep);
if (sector >= sdebug_store_sectors) {
/* Force wrap */
tmp_sec = sector;
@@ -1968,7 +1964,7 @@ static int prot_verify_write(struct scsi_cmnd *SCpnt, sector_t start_sec,
* correctness we need to verify each sector
* before writing it to "stable" storage
*/
- memcpy(dif_storep + dif_offset(sector), sdt, 8);
+ memcpy(dif_storep + sector, sdt, sizeof(*sdt));
sector++;