[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [xen master] xen/evtchn: Add an helper to reserve/allocate a port
commit 4e1eade78ef3f339ed671851abce398e80ba04ca Author: Stanislav Kinsburskii <staskins@xxxxxxxxxx> AuthorDate: Wed Sep 7 17:27:33 2022 +0100 Commit: Julien Grall <jgrall@xxxxxxxxxx> CommitDate: Thu Sep 8 12:21:58 2022 +0100 xen/evtchn: Add an helper to reserve/allocate a port In a follow-up patch we will want to either reserve or allocate a port for various event channel helpers. A new wrapper is introduced to either reserve a given port or allocate a fresh one if zero. Take the opportunity to replace the open-coded version in evtchn_bind_virq(). Signed-off-by: Stanislav Kinsburskii <staskins@xxxxxxxxxx> Signed-off-by: Julien Grall <jgrall@xxxxxxxxxx> Signed-off-by: Rahul Singh <rahul.singh@xxxxxxx> Acked-by: Jan Beulich <jbeulich@xxxxxxxx> --- xen/common/event_channel.c | 29 ++++++++++++++++------------- 1 file changed, 16 insertions(+), 13 deletions(-) diff --git a/xen/common/event_channel.c b/xen/common/event_channel.c index f81c229358..565ab71881 100644 --- a/xen/common/event_channel.c +++ b/xen/common/event_channel.c @@ -305,6 +305,18 @@ void evtchn_free(struct domain *d, struct evtchn *chn) xsm_evtchn_close_post(chn); } +static int evtchn_get_port(struct domain *d, evtchn_port_t port) +{ + int rc; + + if ( port != 0 ) + rc = evtchn_allocate_port(d, port); + else + rc = get_free_port(d); + + return rc ?: port; +} + int evtchn_alloc_unbound(evtchn_alloc_unbound_t *alloc) { struct evtchn *chn; @@ -462,19 +474,10 @@ int evtchn_bind_virq(evtchn_bind_virq_t *bind, evtchn_port_t port) if ( read_atomic(&v->virq_to_evtchn[virq]) ) ERROR_EXIT(-EEXIST); - if ( port != 0 ) - { - if ( (rc = evtchn_allocate_port(d, port)) != 0 ) - ERROR_EXIT(rc); - } - else - { - int alloc_port = get_free_port(d); - - if ( alloc_port < 0 ) - ERROR_EXIT(alloc_port); - port = alloc_port; - } + port = rc = evtchn_get_port(d, port); + if ( rc < 0 ) + ERROR_EXIT(rc); + rc = 0; chn = evtchn_from_port(d, port); -- generated by git-patchbot for /home/xen/git/xen.git#master
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