[src/trunk]: src/sys/dev/ata Count only the initial start of a transfer, not ...

[mlelstv <mlelstv%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/7b0c54d74ea5
branches:  trunk
changeset: 457011:7b0c54d74ea5
user:      mlelstv <mlelstv%NetBSD.org@localhost>
date:      Thu Jun 06 20:41:04 2019 +0000

description:
Count only the initial start of a transfer, not the retries.
Should fix kern/54166.

Thanks to macallan@ for spotting the issue.

diffstat:

 sys/dev/ata/wd.c |  9 ++++++---
 1 files changed, 6 insertions(+), 3 deletions(-)

diffs (38 lines):

diff -r 6a4a30a23108 -r 7b0c54d74ea5 sys/dev/ata/wd.c
--- a/sys/dev/ata/wd.c  Thu Jun 06 16:05:45 2019 +0000
+++ b/sys/dev/ata/wd.c  Thu Jun 06 20:41:04 2019 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: wd.c,v 1.450 2019/05/24 06:01:05 mlelstv Exp $ */
+/*     $NetBSD: wd.c,v 1.451 2019/06/06 20:41:04 mlelstv Exp $ */
 
 /*
  * Copyright (c) 1998, 2001 Manuel Bouyer.  All rights reserved.
@@ -54,7 +54,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: wd.c,v 1.450 2019/05/24 06:01:05 mlelstv Exp $");
+__KERNEL_RCSID(0, "$NetBSD: wd.c,v 1.451 2019/06/06 20:41:04 mlelstv Exp $");
 
 #include "opt_ata.h"
 #include "opt_wd.h"
@@ -734,7 +734,8 @@
                xfer->c_bio.flags |= ATA_FUA;
        }
 
-       wd->inflight++;
+       if (xfer->c_retries == 0)
+               wd->inflight++;
        switch (wd->atabus->ata_bio(wd->drvp, xfer)) {
        case ATACMD_TRY_AGAIN:
                panic("wdstart1: try again");
@@ -989,7 +990,9 @@
 
        ata_free_xfer(wd->drvp->chnl_softc, xfer);
 
+       mutex_enter(&wd->sc_lock);
        wd->inflight--;
+       mutex_exit(&wd->sc_lock);
        dk_done(dksc, bp);
        dk_start(dksc, NULL);
 }