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ivshmem: remove unnecessary dup()

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qemu_chr_fe_get_msgfd() transfers ownership, there is no need to dup the
fd.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Claudio Fontana <claudio.fontana@huawei.com>
This commit is contained in:
Marc-André Lureau 2015-06-22 12:38:34 +02:00
parent 0f14fd71c1
commit dee2151e72
1 changed files with 6 additions and 15 deletions
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21
hw/misc/ivshmem.c
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@ -480,7 +480,7 @@ static bool fifo_update_and_get(IVShmemState *s, const uint8_t *buf, int size,
static void ivshmem_read(void *opaque, const uint8_t *buf, int size)
{
IVShmemState *s = opaque;
int incoming_fd, tmp_fd;
int incoming_fd;
int guest_max_eventfd;
long incoming_posn;
@ -495,21 +495,21 @@ static void ivshmem_read(void *opaque, const uint8_t *buf, int size)
}
/* pick off s->server_chr->msgfd and store it, posn should accompany msg */
tmp_fd = qemu_chr_fe_get_msgfd(s->server_chr);
IVSHMEM_DPRINTF("posn is %ld, fd is %d\n", incoming_posn, tmp_fd);
incoming_fd = qemu_chr_fe_get_msgfd(s->server_chr);
IVSHMEM_DPRINTF("posn is %ld, fd is %d\n", incoming_posn, incoming_fd);
/* make sure we have enough space for this guest */
if (incoming_posn >= s->nb_peers) {
if (increase_dynamic_storage(s, incoming_posn) < 0) {
error_report("increase_dynamic_storage() failed");
if (tmp_fd != -1) {
close(tmp_fd);
if (incoming_fd != -1) {
close(incoming_fd);
}
return;
}
}
if (tmp_fd == -1) {
if (incoming_fd == -1) {
/* if posn is positive and unseen before then this is our posn*/
if ((incoming_posn >= 0) &&
(s->peers[incoming_posn].eventfds == NULL)) {
@ -524,15 +524,6 @@ static void ivshmem_read(void *opaque, const uint8_t *buf, int size)
}
}
/* because of the implementation of get_msgfd, we need a dup */
incoming_fd = dup(tmp_fd);
if (incoming_fd == -1) {
error_report("could not allocate file descriptor %s", strerror(errno));
close(tmp_fd);
return;
}
/* if the position is -1, then it's shared memory region fd */
if (incoming_posn == -1) {