iscsi-target: Fix SNACK Type 1 + BegRun=0 handling

This patch fixes Status SNACK handling of BegRun=0 to allow
for all unacknowledged respones to be resent, instead of
always assuming that BegRun would be an explicit value less
than the current ExpStatSN.

Reported-by: santosh kulkarni <santosh.kulkarni@calsoftinc.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/target/iscsi/iscsi_target_erl1.c b/drivers/target/iscsi/iscsi_target_erl1.c
index e048d6439f4a..cda4d80cfaef 100644
--- a/drivers/target/iscsi/iscsi_target_erl1.c
+++ b/drivers/target/iscsi/iscsi_target_erl1.c
@@ -507,7 +507,9 @@ int iscsit_handle_status_snack(
         u32 last_statsn;
         int found_cmd;
 
-        if (conn->exp_statsn > begrun) {
+        if (!begrun) {
+                begrun = conn->exp_statsn;
+        } else if (conn->exp_statsn > begrun) {
                 pr_err("Got Status SNACK Begrun: 0x%08x, RunLength:"
                         " 0x%08x but already got ExpStatSN: 0x%08x on CID:"
                         " %hu.\n", begrun, runlength, conn->exp_statsn,