For transports which use generic new command these
buffers have yet to be allocated. Instead check afterwards
if command required prot buffers but none are provided.
Also this way, target may support protection information
against legacy initiators (writes are inserted and reads
are stripped).
Signed-off-by: Sagi Grimberg <sagig@xxxxxxxxxxxx>
---
drivers/target/target_core_sbc.c | 3 ---
drivers/target/target_core_transport.c | 21 +++++++++++++++++----
2 files changed, 17 insertions(+), 7 deletions(-)
diff --git a/drivers/target/target_core_sbc.c b/drivers/target/target_core_sbc.c
index dfeb1c2..3f12726 100644
--- a/drivers/target/target_core_sbc.c
+++ b/drivers/target/target_core_sbc.c
@@ -649,9 +649,6 @@ sbc_check_prot(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb,
{
u8 protect = rwprotect(cdb);
- if (!cmd->t_prot_sg || !cmd->t_prot_nents)
- return true;
-
switch (dev->dev_attrib.pi_prot_type) {
case TARGET_DIF_TYPE3_PROT:
cmd->reftag_seed = 0xffffffff;
diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index f029bb7..3a5550a 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -1365,6 +1365,13 @@ int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess
target_put_sess_cmd(se_sess, se_cmd);
return 0;
}
+
+ rc = target_setup_cmd_from_cdb(se_cmd, cdb);
+ if (rc != 0) {
+ transport_generic_request_failure(se_cmd, rc);
+ return 0;
+ }
+
/*
* Save pointers for SGLs containing protection information,
* if present.
@@ -1374,11 +1381,17 @@ int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess
se_cmd->t_prot_nents = sgl_prot_count;
}
- rc = target_setup_cmd_from_cdb(se_cmd, cdb);
- if (rc != 0) {
- transport_generic_request_failure(se_cmd, rc);
- return 0;
+ /*
+ * Fail if protection operation requiers protection
+ * information buffers but None are provided!
+ */
+ if ((!se_cmd->t_prot_sg || !se_cmd->t_prot_nents) &&
+ (se_cmd->prot_op != TARGET_PROT_NORMAL)) {
+ pr_err("ERROR: protection information was requested but "
+ "protection buffers weren't provided.\n");
+ return -EINVAL;
}
+
/*
* When a non zero sgl_count has been passed perform SGL passthrough
* mapping for pre-allocated fabric memory instead of having target
--
1.7.1
--
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