qemu/0025-spice-vmc-two-bugfixes-in-vmc_read.patch
2010-09-14 14:26:08 -05:00

58 lines
2.1 KiB
Diff

From c8fa37e075cf59e8b21af9211f6a6348c92ed098 Mon Sep 17 00:00:00 2001
From: Alon Levy <alevy@redhat.com>
Date: Mon, 12 Jul 2010 22:48:59 +0300
Subject: [PATCH 25/39] spice-vmc: two bugfixes in vmc_read
* throttling with no discard means possible recursion, make
vmc_read handle that.
* zero datapos when data is done (from rhel6 version)
---
hw/spice-vmc.c | 13 ++++++++-----
1 files changed, 8 insertions(+), 5 deletions(-)
diff --git a/hw/spice-vmc.c b/hw/spice-vmc.c
index 3f6a2bb..06e30e6 100644
--- a/hw/spice-vmc.c
+++ b/hw/spice-vmc.c
@@ -45,7 +45,7 @@ static int vmc_write(SpiceVDIPortInstance *sin, const uint8_t *buf, int len)
ssize_t out;
out = virtio_serial_write(&svc->port, buf, len);
- dprintf(svc, 2, "%s: %lu/%d\n", __func__, out, len);
+ dprintf(svc, 3, "%s: %lu/%d\n", __func__, out, len);
return out;
}
@@ -54,13 +54,16 @@ static int vmc_read(SpiceVDIPortInstance *sin, uint8_t *buf, int len)
SpiceVirtualChannel *svc = container_of(sin, SpiceVirtualChannel, sin);
int bytes = MIN(len, svc->datalen);
- dprintf(svc, 2, "%s: %d/%zd\n", __func__, bytes, svc->datalen);
- if (bytes) {
+ dprintf(svc, 2, "%s: %p %d/%d/%zd\n", __func__, svc->datapos, len, bytes, svc->datalen);
+ if (bytes > 0) {
memcpy(buf, svc->datapos, bytes);
svc->datapos += bytes;
svc->datalen -= bytes;
- if (0 == svc->datalen) {
+ assert(svc->datalen >= 0);
+ if (svc->datalen == 0) {
+ svc->datapos = 0;
virtio_serial_throttle_port(&svc->port, false);
+ // ^^^ !!! may call vmc_have_data, so don't touch svc after it!
}
}
return bytes;
@@ -140,7 +143,7 @@ static void vmc_have_data(VirtIOSerialPort *port, const uint8_t *buf, size_t len
SpiceVirtualChannel *svc = DO_UPCAST(SpiceVirtualChannel, port, port);
dprintf(svc, 2, "%s: %zd\n", __func__, len);
- assert(svc->datapos == 0);
+ assert(svc->datalen == 0);
if (svc->bufsize < len) {
svc->bufsize = len;
svc->buffer = qemu_realloc(svc->buffer, svc->bufsize);
--
1.7.2.3