From: Hiral Shah <hishah@cisco.com>
Date: Fri, 18 Apr 2014 19:28:18 +0000 (-0700)
Subject: fnic: Failing to queue aborts due to Q full cause terminate driver timeout
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=668186637e013f41bb3b275fa1a3b993b4da2ccb;p=linux-beck.git

fnic: Failing to queue aborts due to Q full cause terminate driver timeout

In fnic abort handler, abort queuing can be failed when hardware queue is full.
The command state is left as abort queued. The command with abort queued state
will never be queued next time for abort or termiantion.
Fix restores the command state in above case.

Signed-off-by: Hiral Shah <hishah@cisco.com>
Signed-off-by: Sesidhar Baddela <sebaddel@cisco.com>
Signed-off-by: Narsimhulu Musini <nmusini@cisco.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
---

diff --git a/drivers/scsi/fnic/fnic_scsi.c b/drivers/scsi/fnic/fnic_scsi.c
index 0521436d05d6..ea28b5ca4c73 100644
--- a/drivers/scsi/fnic/fnic_scsi.c
+++ b/drivers/scsi/fnic/fnic_scsi.c
@@ -1312,8 +1312,9 @@ static void fnic_cleanup_io(struct fnic *fnic, int exclude_id)
 
 cleanup_scsi_cmd:
 		sc->result = DID_TRANSPORT_DISRUPTED << 16;
-		FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, "fnic_cleanup_io:"
-			      " DID_TRANSPORT_DISRUPTED\n");
+		FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
+			      "%s: sc duration = %lu DID_TRANSPORT_DISRUPTED\n",
+			      __func__, (jiffies - start_time));
 
 		if (atomic64_read(&fnic->io_cmpl_skip))
 			atomic64_dec(&fnic->io_cmpl_skip);
@@ -1733,6 +1734,7 @@ int fnic_abort_cmd(struct scsi_cmnd *sc)
 	struct fnic_stats *fnic_stats;
 	struct abort_stats *abts_stats;
 	struct terminate_stats *term_stats;
+	enum fnic_ioreq_state old_ioreq_state;
 	int tag;
 	DECLARE_COMPLETION_ONSTACK(tm_done);
 
@@ -1793,6 +1795,7 @@ int fnic_abort_cmd(struct scsi_cmnd *sc)
 	 * the completion wont be done till mid-layer, since abort
 	 * has already started.
 	 */
+	old_ioreq_state = CMD_STATE(sc);
 	CMD_STATE(sc) = FNIC_IOREQ_ABTS_PENDING;
 	CMD_ABTS_STATUS(sc) = FCPIO_INVALID_CODE;
 
@@ -1816,6 +1819,8 @@ int fnic_abort_cmd(struct scsi_cmnd *sc)
 	if (fnic_queue_abort_io_req(fnic, sc->request->tag, task_req,
 				    fc_lun.scsi_lun, io_req)) {
 		spin_lock_irqsave(io_lock, flags);
+		if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING)
+			CMD_STATE(sc) = old_ioreq_state;
 		io_req = (struct fnic_io_req *)CMD_SP(sc);
 		if (io_req)
 			io_req->abts_done = NULL;
@@ -1859,12 +1864,8 @@ int fnic_abort_cmd(struct scsi_cmnd *sc)
 	if (CMD_ABTS_STATUS(sc) == FCPIO_INVALID_CODE) {
 		spin_unlock_irqrestore(io_lock, flags);
 		if (task_req == FCPIO_ITMF_ABT_TASK) {
-			FNIC_SCSI_DBG(KERN_INFO,
-				fnic->lport->host, "Abort Driver Timeout\n");
 			atomic64_inc(&abts_stats->abort_drv_timeouts);
 		} else {
-			FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
-				"Terminate Driver Timeout\n");
 			atomic64_inc(&term_stats->terminate_drv_timeouts);
 		}
 		CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_TIMED_OUT;