Add abort flag and use it to terminate processing when an exchange
is timed out or is reset. The abort flag is used in place of the
transport_generic_free_cmd function call in the reset and timeout
cases, because calling that function in that context would free
memory that was in use. The aborted flag allows the lifetime to
be managed in a more normal way, while truncating the processing.
This change eliminates a source of memory corruption which
manifested in a variety of ugly ways.
Signed-off-by: Mark Rustad <mark.d.rustad@xxxxxxxxx>
Acked-by: Kiran Patil <Kiran.patil@xxxxxxxxx>
---
drivers/target/tcm_fc/tcm_fc.h | 1 +
drivers/target/tcm_fc/tfc_cmd.c | 8 +++++++-
drivers/target/tcm_fc/tfc_io.c | 2 ++
3 files changed, 10 insertions(+), 1 deletions(-)
diff --git a/drivers/target/tcm_fc/tcm_fc.h b/drivers/target/tcm_fc/tcm_fc.h
index e05c551..be7ed12 100644
--- a/drivers/target/tcm_fc/tcm_fc.h
+++ b/drivers/target/tcm_fc/tcm_fc.h
@@ -124,6 +124,7 @@ struct ft_cmd {
/* Local sense buffer */
unsigned char ft_sense_buffer[TRANSPORT_SENSE_BUFFER];
u32 was_ddp_setup:1; /* Set only if ddp is setup */
+ u32 aborted:1; /* Set if aborted by reset or timeout */
struct scatterlist *sg; /* Set only if DDP is setup */
u32 sg_cnt; /* No. of item in scatterlist */
};
diff --git a/drivers/target/tcm_fc/tfc_cmd.c b/drivers/target/tcm_fc/tfc_cmd.c
index 9e7e26c..4d3283c 100644
--- a/drivers/target/tcm_fc/tfc_cmd.c
+++ b/drivers/target/tcm_fc/tfc_cmd.c
@@ -126,6 +126,8 @@ int ft_queue_status(struct se_cmd *se_cmd)
struct fc_exch *ep;
size_t len;
+ if (cmd->aborted)
+ return 0;
ft_dump_cmd(cmd, __func__);
ep = fc_seq_exch(cmd->seq);
lport = ep->lp;
@@ -192,6 +194,8 @@ int ft_write_pending(struct se_cmd *se_cmd)
ft_dump_cmd(cmd, __func__);
+ if (cmd->aborted)
+ return 0;
ep = fc_seq_exch(cmd->seq);
lport = ep->lp;
fp = fc_frame_alloc(lport, sizeof(*txrdy));
@@ -265,7 +269,7 @@ static void ft_recv_seq(struct fc_seq *sp, struct fc_frame *fp, void *arg)
if (IS_ERR(fp)) {
/* XXX need to find cmd if queued */
cmd->seq = NULL;
- transport_generic_free_cmd(&cmd->se_cmd, 0);
+ cmd->aborted = true;
return;
}
@@ -445,6 +449,8 @@ int ft_queue_tm_resp(struct se_cmd *se_cmd)
struct se_tmr_req *tmr = se_cmd->se_tmr_req;
enum fcp_resp_rsp_codes code;
+ if (cmd->aborted)
+ return 0;
switch (tmr->response) {
case TMR_FUNCTION_COMPLETE:
code = FCP_TMF_CMPL;
diff --git a/drivers/target/tcm_fc/tfc_io.c b/drivers/target/tcm_fc/tfc_io.c
index d8cabc2..7b34f9b 100644
--- a/drivers/target/tcm_fc/tfc_io.c
+++ b/drivers/target/tcm_fc/tfc_io.c
@@ -81,6 +81,8 @@ int ft_queue_data_in(struct se_cmd *se_cmd)
void *from;
void *to = NULL;
+ if (cmd->aborted)
+ return 0;
ep = fc_seq_exch(cmd->seq);
lport = ep->lp;
cmd->seq = lport->tt.seq_start_next(cmd->seq);
--
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