commit 11277846e819b9eef3db5ac833a6a47f95f5ef15
author Roman Kagan <rkagan@virtuozzo.com> Wed Apr 26 17:18:08 2017 +0300
committer Kevin O'Connor <kevin@koconnor.net> Tue May 02 19:57:04 2017 -0400
tree b5ce85926acbde9a8c87f020a5ca2239b31e0c50
parent cf480dd3edd851db8ad62342937e25c064960b31

lsi-scsi: reset in case of a serious problem

When the device reports a serious problem via SIST[01] registers, it
needs to be reset, otherwise the following requests will most likely
fail, too.

In particular, REPORT LUNS which fails (wrongly) with underflow in QEMU
makes all the following requests fail, too, rendering the device
unusable.

Signed-off-by: Roman Kagan <rkagan@virtuozzo.com>

src/hw/lsi-scsi.c

diff --git a/src/hw/lsi-scsi.c b/src/hw/lsi-scsi.c
index b63430d..d264993 100644
--- a/src/hw/lsi-scsi.c
+++ b/src/hw/lsi-scsi.c
@@ -116,6 +116,8 @@
         u8 sist0 = inb(iobase + LSI_REG_SIST0);
         u8 sist1 = inb(iobase + LSI_REG_SIST1);
         if (sist0 || sist1) {
+            /* serious problem, can't continue w/o reset */
+            outb(LSI_ISTAT0_SRST, iobase + LSI_REG_ISTAT0);
             goto fail;
         }
         if (dstat & 0x04) {