Target/sbc: Fix protection copy routine
Need to take into account that protection sg_list
(copy-buffer) may consist of multiple entries.
Changes from v0:
- Changed commit description
Signed-off-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
diff --git a/drivers/target/target_core_sbc.c b/drivers/target/target_core_sbc.c
index fa3cae3..a448944 100644
--- a/drivers/target/target_core_sbc.c
+++ b/drivers/target/target_core_sbc.c
@@ -1074,12 +1074,19 @@
struct scatterlist *psg;
void *paddr, *addr;
unsigned int i, len, left;
+ unsigned int offset = 0;
left = sectors * dev->prot_length;
for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) {
len = min(psg->length, left);
+ if (offset >= sg->length) {
+ sg = sg_next(sg);
+ offset = 0;
+ sg_off = sg->offset;
+ }
+
paddr = kmap_atomic(sg_page(psg)) + psg->offset;
addr = kmap_atomic(sg_page(sg)) + sg_off;
@@ -1089,6 +1096,7 @@
memcpy(addr, paddr, len);
left -= len;
+ offset += len;
kunmap_atomic(paddr);
kunmap_atomic(addr);
}
