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authorSagi Grimberg <sagig@mellanox.com>2014-02-12 11:40:25 +0200
committerNicholas Bellinger <nab@linux-iscsi.org>2014-02-12 15:14:45 -0800
commitd6a65fdc8903e632aa7bf86ee0f61a73969371f6 (patch)
treec18b376c410888a03f54414d3f420f66f1faf872
parent9d8abf45944e4f1c18a04070fc3ed2f3ffcbbcb6 (diff)
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>
-rw-r--r--drivers/target/target_core_sbc.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/target/target_core_sbc.c b/drivers/target/target_core_sbc.c
index fa3cae393e13..a4489444ffbc 100644
--- a/drivers/target/target_core_sbc.c
+++ b/drivers/target/target_core_sbc.c
@@ -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);
}