From: Wang Chao wangchao342@hisilicon.com
driver inclusion category: bugfix bugzilla: NA CVE: NA
For a system with PAGE_SIZE of 16K or 64K, the size every time we want to alloc may be small like 4K, but for function dmam_alloc_coherent(), the least size it allocates is PAGE_SIZE, so it will waste much memory for the situation.
To solve the issue, limit the minimum allocation size of slot buf to PAGE_SIZE.
Signed-off-by: Wang Chao wangchao342@hisilicon.com Reviewed-by: Zhu Xiongxiong zhuxiongxiong@huawei.com Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- drivers/scsi/hisi_sas/hisi_sas_main.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/scsi/hisi_sas/hisi_sas_main.c b/drivers/scsi/hisi_sas/hisi_sas_main.c index ff5330bcbb91..396eb230ffc1 100644 --- a/drivers/scsi/hisi_sas/hisi_sas_main.c +++ b/drivers/scsi/hisi_sas/hisi_sas_main.c @@ -2415,7 +2415,7 @@ int hisi_sas_alloc(struct hisi_hba *hisi_hba) else sz_slot_buf_ru = roundup(sizeof( struct hisi_sas_slot_dif_buf_table), 64); - s = lcm(max_command_entries_ru, sz_slot_buf_ru); + s = max(lcm(max_command_entries_ru, sz_slot_buf_ru), PAGE_SIZE); blk_cnt = (max_command_entries_ru * sz_slot_buf_ru) / s; slots_per_blk = s / sz_slot_buf_ru; for (i = 0; i < blk_cnt; i++) {