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authorMark Rustad <mark.d.rustad@intel.com>2012-04-03 10:24:41 -0700
committerNicholas Bellinger <nab@linux-iscsi.org>2012-04-06 18:56:43 -0700
commite1c4038282c7586c3544542b37872c434669d3ac (patch)
treef747aea02b1e52b14ba89bd7606cd4d8bdccc279
parentdd775ae2549217d3ae09363e3edb305d0fa19928 (diff)
downloadconfigs-e1c4038282c7586c3544542b37872c434669d3ac.tar.gz
tcm_fc: Add abort flag for gracefully handling exchange timeout
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. (nab: Drop unused struct fc_exch *ep in ft_recv_seq) Signed-off-by: Mark Rustad <mark.d.rustad@intel.com> Acked-by: Kiran Patil <Kiran.patil@intel.com> Cc: <stable@vger.kernel.org> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
-rw-r--r--drivers/target/tcm_fc/tcm_fc.h1
-rw-r--r--drivers/target/tcm_fc/tfc_cmd.c10
-rw-r--r--drivers/target/tcm_fc/tfc_io.c2
3 files changed, 11 insertions, 2 deletions
diff --git a/drivers/target/tcm_fc/tcm_fc.h b/drivers/target/tcm_fc/tcm_fc.h
index 830657908db..c5eb3c33c3d 100644
--- a/drivers/target/tcm_fc/tcm_fc.h
+++ b/drivers/target/tcm_fc/tcm_fc.h
@@ -122,6 +122,7 @@ 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 62dec9715ce..a375f257aab 100644
--- a/drivers/target/tcm_fc/tfc_cmd.c
+++ b/drivers/target/tcm_fc/tfc_cmd.c
@@ -121,6 +121,8 @@ 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;
@@ -187,6 +189,8 @@ 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));
@@ -252,10 +256,10 @@ static void ft_recv_seq(struct fc_seq *sp, struct fc_frame *fp, void *arg)
struct ft_cmd *cmd = arg;
struct fc_frame_header *fh;
- if (IS_ERR(fp)) {
+ if (unlikely(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;
}
@@ -399,6 +403,8 @@ 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 2b693eefac5..dc7c0db26e2 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);