xen/sound: switch xen_snd_front to use INVALID_GRANT_REF

Instead of using a private macro for an invalid grant reference use
the common one.

Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
Tested-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com> # Arm64 only
Signed-off-by: Juergen Gross <jgross@suse.com>

diff --git a/sound/xen/xen_snd_front_evtchnl.c b/sound/xen/xen_snd_front_evtchnl.c
index ecbc294..3e21369 100644 (file)
--- a/sound/xen/xen_snd_front_evtchnl.c
+++ b/sound/xen/xen_snd_front_evtchnl.c
@@ -167,7 +167,7 @@ static void evtchnl_free(struct xen_snd_front_info *front_info,
                xenbus_free_evtchn(front_info->xb_dev, channel->port);
 
        /* End access and free the page. */
-       if (channel->gref != GRANT_INVALID_REF)
+       if (channel->gref != INVALID_GRANT_REF)
                gnttab_end_foreign_access(channel->gref, page);
        else
                free_page(page);
@@ -207,7 +207,7 @@ static int evtchnl_alloc(struct xen_snd_front_info *front_info, int index,
        channel->index = index;
        channel->front_info = front_info;
        channel->state = EVTCHNL_STATE_DISCONNECTED;
-       channel->gref = GRANT_INVALID_REF;
+       channel->gref = INVALID_GRANT_REF;
        page = get_zeroed_page(GFP_KERNEL);
        if (!page) {
                ret = -ENOMEM;

diff --git a/sound/xen/xen_snd_front_evtchnl.h b/sound/xen/xen_snd_front_evtchnl.h
index cbe51fd..3675fba 100644 (file)
--- a/sound/xen/xen_snd_front_evtchnl.h
+++ b/sound/xen/xen_snd_front_evtchnl.h
@@ -15,15 +15,6 @@
 
 struct xen_snd_front_info;
 
-#ifndef GRANT_INVALID_REF
-/*
- * FIXME: usage of grant reference 0 as invalid grant reference:
- * grant reference 0 is valid, but never exposed to a PV driver,
- * because of the fact it is already in use/reserved by the PV console.
- */
-#define GRANT_INVALID_REF      0
-#endif
-
 /* Timeout in ms to wait for backend to respond. */
 #define VSND_WAIT_BACK_MS      3000