[PATCH spice] smartcard: set char device state

[marcandre.lureau@xxxxxxxxxx]

From: Marc-André Lureau <marcandre.lureau@xxxxxxxxxx>

Follow all other char devices implementation (spicevmc, agent,
stream-device) and set the char device state when
connected/disconnected. This allows qemu to discard writes, optimize a
bit the source polling, and will trigger HUP events.

See related qemu "char/spice: discard write() if backend is
disconnected".

Note: sif->state() should probably be handled at the char-device
level. I am not sure what the smartcard channel really brings over
plain spicevmc...

Signed-off-by: Marc-André Lureau <marcandre.lureau@xxxxxxxxxx>
---
 server/smartcard.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/server/smartcard.c b/server/smartcard.c
index 2cb68e06..403805a8 100644
--- a/server/smartcard.c
+++ b/server/smartcard.c
@@ -343,6 +343,11 @@ void smartcard_char_device_attach_client(SpiceCharDeviceInstance *char_device,
         dev->priv->scc = NULL;
         smartcard_channel_client_set_char_device(scc, NULL);
         red_channel_client_disconnect(RED_CHANNEL_CLIENT(scc));
+    } else {
+        SpiceCharDeviceInterface *sif = spice_char_device_get_interface(char_device);
+        if (sif->state) {
+            sif->state(char_device, 1);
+        }
     }
 }
 
@@ -373,11 +378,21 @@ gboolean smartcard_char_device_notify_reader_remove(RedCharDeviceSmartcard *dev)
 void smartcard_char_device_detach_client(RedCharDeviceSmartcard *smartcard,
                                          SmartCardChannelClient *scc)
 {
+    SpiceCharDeviceInterface *sif;
+    SpiceCharDeviceInstance *sin;
+
+    g_object_get(smartcard, "sin", &sin, NULL);
+    sif = spice_char_device_get_interface(sin);
+
     spice_assert(smartcard->priv->scc == scc);
     red_char_device_client_remove(RED_CHAR_DEVICE(smartcard),
                                   red_channel_client_get_client(RED_CHANNEL_CLIENT(scc)));
     smartcard_channel_client_set_char_device(scc, NULL);
     smartcard->priv->scc = NULL;
+
+    if (sif->state) {
+        sif->state(sin, 0);
+    }
 }
 
 SmartCardChannelClient* smartcard_char_device_get_client(RedCharDeviceSmartcard *smartcard)
-- 
2.18.0.547.g1d89318c48

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