qla2xxx: Fix hang due to cmd_kref not decrementing

Signed-off-by: Quinn Tran <quinn.tran@qlogic.com>
Signed-off-by: Saurav Kashyap <saurav.kashyap@qlogic.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>

diff --git a/drivers/scsi/qla2xxx/qla_target.c b/drivers/scsi/qla2xxx/qla_target.c
index 94b726e..2ba4433 100644 (file)
--- a/drivers/scsi/qla2xxx/qla_target.c
+++ b/drivers/scsi/qla2xxx/qla_target.c
@@ -2409,6 +2409,7 @@ int qlt_xmit_response(struct qla_tgt_cmd *cmd, int xmit_type,
 
 
        cmd->state = QLA_TGT_STATE_PROCESSED; /* Mid-level is done processing */
+       cmd->cmd_sent_to_fw = 1;
 
        qla2x00_start_iocbs(vha, vha->req);
        spin_unlock_irqrestore(&ha->hardware_lock, flags);
@@ -2484,6 +2485,7 @@ int qlt_rdy_to_xfer(struct qla_tgt_cmd *cmd)
                qlt_load_data_segments(&prm, vha);
 
        cmd->state = QLA_TGT_STATE_NEED_DATA;
+       cmd->cmd_sent_to_fw = 1;
 
        qla2x00_start_iocbs(vha, vha->req);
        spin_unlock_irqrestore(&ha->hardware_lock, flags);
@@ -2717,19 +2719,10 @@ static void qlt_send_term_exchange(struct scsi_qla_host *vha,
        if (rc == -ENOMEM)
                qlt_alloc_qfull_cmd(vha, atio, 0, 0);
        spin_unlock_irqrestore(&vha->hw->hardware_lock, flags);
+
 done:
-       /*
-        * Terminate exchange will tell fw to release any active CTIO
-        * that's in FW posession and cleanup the exchange.
-        *
-        * "cmd->state == QLA_TGT_STATE_ABORTED" means CTIO is still
-        * down at FW.  Free the cmd later when CTIO comes back later
-        * w/aborted(0x2) status.
-        *
-        * "cmd->state != QLA_TGT_STATE_ABORTED" means CTIO is already
-        * back w/some err.  Free the cmd now.
-        */
-       if ((rc == 1) && (cmd->state != QLA_TGT_STATE_ABORTED)) {
+       if (cmd && ((cmd->state != QLA_TGT_STATE_ABORTED) ||
+           !cmd->cmd_sent_to_fw)) {
                if (!ha_locked && !in_interrupt())
                        msleep(250); /* just in case */
 
@@ -3071,6 +3064,7 @@ static void qlt_do_ctio_completion(struct scsi_qla_host *vha, uint32_t handle,
 
        se_cmd = &cmd->se_cmd;
        tfo = se_cmd->se_tfo;
+       cmd->cmd_sent_to_fw = 0;
 
        if (cmd->sg_mapped)
                qlt_unmap_sg(vha, cmd);

diff --git a/drivers/scsi/qla2xxx/qla_target.h b/drivers/scsi/qla2xxx/qla_target.h
index 0c768f5..b07b230 100644 (file)
--- a/drivers/scsi/qla2xxx/qla_target.h
+++ b/drivers/scsi/qla2xxx/qla_target.h
@@ -917,6 +917,7 @@ struct qla_tgt_cmd {
        unsigned int ctx_dsd_alloced:1;
        unsigned int q_full:1;
        unsigned int term_exchg:1;
+       unsigned int cmd_sent_to_fw:1;
 
        struct scatterlist *sg; /* cmd data buffer SG vector */
        int sg_cnt;             /* SG segments count */