From 2f61a7bed440164c35c739fcef10d19edef3f8ea Mon Sep 17 00:00:00 2001

From: Hans de Goede <hdegoede@redhat.com>

Date: Tue, 19 Jul 2011 10:56:19 +0200

Subject: [PATCH 111/114] usb-redir: Add flow control support

Signed-off-by: Hans de Goede <hdegoede@redhat.com>

---

 hw/usb/redirect.c |   26 ++++++++++++++++++++++++--

 1 file changed, 24 insertions(+), 2 deletions(-)

diff --git a/hw/usb/redirect.c b/hw/usb/redirect.c

index 6e8180e..5f55d78 100644

--- a/hw/usb/redirect.c

+++ b/hw/usb/redirect.c

@@ -238,12 +238,22 @@ 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;

 }

 /*

@@ -890,10 +900,22 @@ static void usbredir_chardev_event(void *opaque, int event)

     }

 }

+static void usbredir_chardev_write_unblocked(void *opaque)

+{

+    USBRedirDevice *dev = opaque;

+

+    if (dev->parser == NULL) {

+        /* usbredir_open_close_bh hasn't handled the open event yet */

+        return;

+    }

+    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,

 };

 /*

-- 

1.7.10.4