From 5399dd7756a093453751dea34212ba19db328eb4 Mon Sep 17 00:00:00 2001 From: Hans de Goede Date: Tue, 19 Jul 2011 10:56:19 +0200 Subject: [PATCH] usb-redir: Add flow control support Signed-off-by: Hans de Goede Signed-off-by: Cole Robinson --- hw/usb/redirect.c | 22 ++++++++++++++++++++-- 1 file changed, 20 insertions(+), 2 deletions(-) diff --git a/hw/usb/redirect.c b/hw/usb/redirect.c index 8b22c80..b7c7f1e 100644 --- a/hw/usb/redirect.c +++ b/hw/usb/redirect.c @@ -229,12 +229,22 @@ static int usbredir_read(void *priv, uint8_t *data, int count) static int usbredir_write(void *priv, uint8_t *data, int count) { USBRedirDevice *dev = priv; + int r; - if (!dev->cs->opened) { + if (!dev->cs->opened || dev->cs->write_blocked) { return 0; } - return qemu_chr_fe_write(dev->cs, data, count); + r = qemu_chr_fe_write(dev->cs, data, count); + + if (r < 0) { + if (dev->cs->write_blocked) { + return 0; + } + return -1; + } + + return r; } /* @@ -867,10 +877,18 @@ static void usbredir_chardev_event(void *opaque, int event) } } +static void usbredir_chardev_write_unblocked(void *opaque) +{ + USBRedirDevice *dev = opaque; + + usbredirparser_do_write(dev->parser); +} + static const QemuChrHandlers usbredir_chr_handlers = { .fd_can_read = usbredir_chardev_can_read, .fd_read = usbredir_chardev_read, .fd_event = usbredir_chardev_event, + .fd_write_unblocked = usbredir_chardev_write_unblocked, }; /*