From 1300b2733a297f9a59deb4eebbd437a5833f3f41 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Marc-Andr=C3=A9=20Lureau?= Date: Tue, 15 Sep 2015 17:21:37 +0200 Subject: [PATCH] ivshmem: simplify around increase_dynamic_storage() MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Set the number of peers and array allocation in a single place. Rename to better reflect the function content. Signed-off-by: Marc-André Lureau Reviewed-by: Claudio Fontana --- hw/misc/ivshmem.c | 27 +++++++++++---------------- 1 file changed, 11 insertions(+), 16 deletions(-) diff --git a/hw/misc/ivshmem.c b/hw/misc/ivshmem.c index 3787398c19..6f41960095 100644 --- a/hw/misc/ivshmem.c +++ b/hw/misc/ivshmem.c @@ -417,30 +417,28 @@ static void close_guest_eventfds(IVShmemState *s, int posn) /* this function increase the dynamic storage need to store data about other * guests */ -static int increase_dynamic_storage(IVShmemState *s, int new_min_size) +static int resize_peers(IVShmemState *s, int new_min_size) { - int j, old_nb_alloc; + int j, old_size; /* limit number of max peers */ if (new_min_size <= 0 || new_min_size > IVSHMEM_MAX_PEERS) { return -1; } - - old_nb_alloc = s->nb_peers; - - if (new_min_size >= s->nb_peers) { - /* +1 because #new_min_size is used as last array index */ - s->nb_peers = new_min_size + 1; - } else { + if (new_min_size <= s->nb_peers) { return 0; } + old_size = s->nb_peers; + s->nb_peers = new_min_size; + IVSHMEM_DPRINTF("bumping storage to %d guests\n", s->nb_peers); + s->peers = g_realloc(s->peers, s->nb_peers * sizeof(Peer)); /* zero out new pointers */ - for (j = old_nb_alloc; j < s->nb_peers; j++) { + for (j = old_size; j < s->nb_peers; j++) { s->peers[j].eventfds = NULL; s->peers[j].nb_eventfds = 0; } @@ -508,8 +506,8 @@ static void ivshmem_read(void *opaque, const uint8_t *buf, int size) /* 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 (resize_peers(s, incoming_posn + 1) < 0) { + error_report("failed to resize peers array"); if (incoming_fd != -1) { close(incoming_fd); } @@ -812,12 +810,9 @@ static void pci_ivshmem_realize(PCIDevice *dev, Error **errp) } /* we allocate enough space for 16 guests and grow as needed */ - s->nb_peers = 16; + resize_peers(s, 16); s->vm_id = -1; - /* allocate/initialize space for interrupt handling */ - s->peers = g_malloc0(s->nb_peers * sizeof(Peer)); - pci_register_bar(dev, 2, attr, &s->bar); s->eventfd_chr = g_malloc0(s->vectors * sizeof(CharDriverState *)); -- 2.39.5