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Target/sbc: Fix protection copy routine

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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>
This commit is contained in:
Sagi Grimberg 2014-02-12 11:40:25 +02:00 committed by Nicholas Bellinger
parent 9d8abf4594
commit d6a65fdc89
1 changed files with 8 additions and 0 deletions
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8
drivers/target/target_core_sbc.c
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@ -1074,12 +1074,19 @@ sbc_dif_copy_prot(struct se_cmd *cmd, unsigned int sectors, bool read,
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 @@ sbc_dif_copy_prot(struct se_cmd *cmd, unsigned int sectors, bool read,
memcpy(addr, paddr, len);
left -= len;
offset += len;
kunmap_atomic(paddr);
kunmap_atomic(addr);
}