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spice-qemu-char: Remove intermediate buffer 

virtio-serial's buffer is valid when it calls us, and we don't
access it otherwise: vmc_read is only called in response to wakeup,
or else we set datalen=0 and throttle. Then vmc_read is called back,
we return 0 (not accessing the buffer) and set the timer to unthrottle.

Also make datalen int and not ssize_t (to fit spice_chr_write signature).

HdG: Update to apply to spice-qemu-char with new gio-channel based
flowcontrol support.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Alon Levy 2013-04-05 11:30:23 +02:00 committed by Gerd Hoffmann
parent ae893e5e81
commit b010cec86b
1 changed files with 3 additions and 9 deletions
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12
spice-qemu-char.c
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@ -14,9 +14,8 @@ typedef struct SpiceCharDriver {
char *subtype;
bool active;
bool blocked;
uint8_t *buffer;
uint8_t *datapos;
ssize_t bufsize, datalen;
const uint8_t *datapos;
int datalen;
QLIST_ENTRY(SpiceCharDriver) next;
} SpiceCharDriver;
@ -186,12 +185,7 @@ static int spice_chr_write(CharDriverState *chr, const uint8_t *buf, int len)
int read_bytes;
assert(s->datalen == 0);
if (s->bufsize < len) {
s->bufsize = len;
s->buffer = g_realloc(s->buffer, s->bufsize);
}
memcpy(s->buffer, buf, len);
s->datapos = s->buffer;
s->datapos = buf;
s->datalen = len;
spice_server_char_device_wakeup(&s->sin);
read_bytes = len - s->datalen;