diff options
| -rw-r--r-- | drivers/scsi/libiscsi.c | 54 | ||||
| -rw-r--r-- | include/scsi/libiscsi.h | 7 |
2 files changed, 50 insertions, 11 deletions
diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c index f5915d4d63d..efceed451b4 100644 --- a/drivers/scsi/libiscsi.c +++ b/drivers/scsi/libiscsi.c @@ -1056,7 +1056,9 @@ static int iscsi_exec_abort_task(struct scsi_cmnd *sc, ctask->mtask = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr, NULL, 0); if (!ctask->mtask) { + spin_unlock_bh(&session->lock); iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); + spin_lock_bh(&session->lock) debug_scsi("abort sent failure [itt 0x%x]\n", ctask->itt); return -EPERM; } @@ -1073,6 +1075,7 @@ static int iscsi_exec_abort_task(struct scsi_cmnd *sc, debug_scsi("abort set timeout [itt 0x%x]\n", ctask->itt); } spin_unlock_bh(&session->lock); + mutex_unlock(&session->eh_mutex); scsi_queue_work(session->host, &conn->xmitwork); /* @@ -1090,6 +1093,7 @@ static int iscsi_exec_abort_task(struct scsi_cmnd *sc, if (signal_pending(current)) flush_signals(current); del_timer_sync(&conn->tmabort_timer); + mutex_lock(&session->eh_mutex); spin_lock_bh(&session->lock); return 0; } @@ -1165,31 +1169,45 @@ static void fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, __iscsi_put_ctask(ctask); } +static void iscsi_suspend_tx(struct iscsi_conn *conn) +{ + set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); + scsi_flush_work(conn->session->host); +} + +static void iscsi_start_tx(struct iscsi_conn *conn) +{ + clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); + scsi_queue_work(conn->session->host, &conn->xmitwork); +} + int iscsi_eh_abort(struct scsi_cmnd *sc) { + struct Scsi_Host *host = sc->device->host; + struct iscsi_session *session = iscsi_hostdata(host->hostdata); struct iscsi_cmd_task *ctask; struct iscsi_conn *conn; - struct iscsi_session *session; int rc; + mutex_lock(&session->eh_mutex); + spin_lock_bh(&session->lock); /* * if session was ISCSI_STATE_IN_RECOVERY then we may not have * got the command. */ if (!sc->SCp.ptr) { debug_scsi("sc never reached iscsi layer or it completed.\n"); + spin_unlock_bh(&session->lock); + mutex_unlock(&session->eh_mutex); return SUCCESS; } ctask = (struct iscsi_cmd_task *)sc->SCp.ptr; conn = ctask->conn; - session = conn->session; conn->eh_abort_cnt++; debug_scsi("aborting [sc %p itt 0x%x]\n", sc, ctask->itt); - spin_lock_bh(&session->lock); - /* * If we are not logged in or we have started a new session * then let the host reset code handle this @@ -1226,6 +1244,7 @@ int iscsi_eh_abort(struct scsi_cmnd *sc) switch (conn->tmabort_state) { case TMABORT_SUCCESS: spin_unlock_bh(&session->lock); + iscsi_suspend_tx(conn); /* * clean up task if aborted. grab the recv lock as a writer */ @@ -1234,11 +1253,7 @@ int iscsi_eh_abort(struct scsi_cmnd *sc) fail_command(conn, ctask, DID_ABORT << 16); spin_unlock(&session->lock); write_unlock_bh(conn->recv_lock); - /* - * make sure xmit thread is not still touching the - * ctask/scsi_cmnd - */ - scsi_flush_work(session->host); + iscsi_start_tx(conn); goto success_unlocked; case TMABORT_NOT_FOUND: if (!ctask->sc) { @@ -1258,12 +1273,14 @@ success: spin_unlock_bh(&session->lock); success_unlocked: debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, ctask->itt); + mutex_unlock(&session->eh_mutex); return SUCCESS; failed: spin_unlock_bh(&session->lock); failed_unlocked: debug_scsi("abort failed [sc %lx itt 0x%x]\n", (long)sc, ctask->itt); + mutex_unlock(&session->eh_mutex); return FAILED; } EXPORT_SYMBOL_GPL(iscsi_eh_abort); @@ -1410,6 +1427,7 @@ iscsi_session_setup(struct iscsi_transport *iscsit, session->max_cmdsn = initial_cmdsn + 1; session->max_r2t = 1; session->tt = iscsit; + mutex_init(&session->eh_mutex); /* initialize SCSI PDU commands pool */ if (iscsi_pool_init(&session->cmdpool, session->cmds_max, @@ -1743,9 +1761,22 @@ static void iscsi_start_session_recovery(struct iscsi_session *session, { int old_stop_stage; + mutex_lock(&session->eh_mutex); spin_lock_bh(&session->lock); if (conn->stop_stage == STOP_CONN_TERM) { spin_unlock_bh(&session->lock); + mutex_unlock(&session->eh_mutex); + return; + } + + /* + * The LLD either freed/unset the lock on us, or userspace called + * stop but did not create a proper connection (connection was never + * bound or it was unbound then stop was called). + */ + if (!conn->recv_lock) { + spin_unlock_bh(&session->lock); + mutex_unlock(&session->eh_mutex); return; } @@ -1762,9 +1793,9 @@ static void iscsi_start_session_recovery(struct iscsi_session *session, old_stop_stage = conn->stop_stage; conn->stop_stage = flag; conn->c_stage = ISCSI_CONN_STOPPED; - set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); spin_unlock_bh(&session->lock); - scsi_flush_work(session->host); + + iscsi_suspend_tx(conn); write_lock_bh(conn->recv_lock); set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); @@ -1793,6 +1824,7 @@ static void iscsi_start_session_recovery(struct iscsi_session *session, fail_all_commands(conn); flush_control_queues(session, conn); spin_unlock_bh(&session->lock); + mutex_unlock(&session->eh_mutex); } void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) diff --git a/include/scsi/libiscsi.h b/include/scsi/libiscsi.h index 007d442412e..b4b31132618 100644 --- a/include/scsi/libiscsi.h +++ b/include/scsi/libiscsi.h @@ -205,6 +205,13 @@ struct iscsi_queue { }; struct iscsi_session { + /* + * Syncs up the scsi eh thread with the iscsi eh thread when sending + * task management functions. This must be taken before the session + * and recv lock. + */ + struct mutex eh_mutex; + /* iSCSI session-wide sequencing */ uint32_t cmdsn; uint32_t exp_cmdsn; |