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 | 2 ++
 1 file changed, 2 insertions(+)

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 @@ lsi_scsi_process_op(struct disk_op_s *op)
         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) {
-- 
2.9.3


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