From: Akinobu Mita Date: Sat, 29 Jun 2013 08:59:18 +0000 (+0900) Subject: [SCSI] scsi_debug: simplify offset calculation for dif_storep X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=e18d8bea33077d259cc826c6d3fa76d36af61876;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git [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 Acked-by: Douglas Gilbert Acked-by: "Martin K. Petersen" Signed-off-by: James Bottomley --- 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++;