From 4051a1f062c9b336343e22efa291ed15d235cd4f Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= Date: Tue, 23 Nov 2021 12:17:31 +0100 Subject: [PATCH] hw/scsi/lsi53c895a: Do not abort when DMA requested and no data queued MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit If asked for DMA request and no data is available, simply wait for data to be queued, do not abort. This fixes: $ cat << EOF | \ qemu-system-i386 -nographic -M q35,accel=qtest -serial none \ -monitor none -qtest stdio -trace lsi* \ -drive if=none,id=drive0,file=null-co://,file.read-zeroes=on,format=raw \ -device lsi53c895a,id=scsi0 -device scsi-hd,drive=drive0,bus=scsi0.0,channel=0,scsi-id=0,lun=0 lsi_reset Reset lsi_reg_write Write reg DSP2 0x2e = 0xff lsi_reg_write Write reg DSP3 0x2f = 0xff lsi_execute_script SCRIPTS dsp=0xffff0000 opcode 0x184a3900 arg 0x4a8b2d75 qemu-system-i386: hw/scsi/lsi53c895a.c:624: lsi_do_dma: Assertion `s->current' failed. (gdb) bt #5 0x00007ffff4e8a3a6 in __GI___assert_fail (assertion=0x5555560accbc "s->current", file=0x5555560acc28 "hw/scsi/lsi53c895a.c", line=624, function=0x5555560adb18 "lsi_do_dma") at assert.c:101 #6 0x0000555555aa33b9 in lsi_do_dma (s=0x555557805ac0, out=1) at hw/scsi/lsi53c895a.c:624 #7 0x0000555555aa5042 in lsi_execute_script (s=0x555557805ac0) at hw/scsi/lsi53c895a.c:1250 #8 0x0000555555aa757a in lsi_reg_writeb (s=0x555557805ac0, offset=47, val=255 '\377') at hw/scsi/lsi53c895a.c:1984 #9 0x0000555555aa875b in lsi_mmio_write (opaque=0x555557805ac0, addr=47, val=255, size=1) at hw/scsi/lsi53c895a.c:2095 Cc: qemu-stable@nongnu.org Cc: Gerd Hoffmann Cc: Vadim Rozenfeld Cc: Stefan Hajnoczi Reported-by: Jérôme Poulin Reported-by: Ruhr-University Reported-by: Gaoning Pan Reported-by: Cheolwoo Myung Fixes: b96a0da06bd ("lsi: move dma_len+dma_buf into lsi_request") BugLink: https://bugs.launchpad.net/qemu/+bug/697510 BugLink: https://bugs.launchpad.net/qemu/+bug/1905521 BugLink: https://bugs.launchpad.net/qemu/+bug/1908515 Resolves: https://gitlab.com/qemu-project/qemu/-/issues/84 Resolves: https://gitlab.com/qemu-project/qemu/-/issues/305 Resolves: https://gitlab.com/qemu-project/qemu/-/issues/552 Signed-off-by: Philippe Mathieu-Daudé Reviewed-by: Laurent Vivier Message-Id: <20211123111732.83137-2-philmd@redhat.com> Signed-off-by: Paolo Bonzini --- hw/scsi/lsi53c895a.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/hw/scsi/lsi53c895a.c b/hw/scsi/lsi53c895a.c index 85e907a785..4c431adb77 100644 --- a/hw/scsi/lsi53c895a.c +++ b/hw/scsi/lsi53c895a.c @@ -621,8 +621,7 @@ static void lsi_do_dma(LSIState *s, int out) dma_addr_t addr; SCSIDevice *dev; - assert(s->current); - if (!s->current->dma_len) { + if (!s->current || !s->current->dma_len) { /* Wait until data is available. */ trace_lsi_do_dma_unavailable(); return;