ivshmem: Don't destroy the chardev on version mismatch

Yes, the chardev is commonly useless after we read a bad version from
it, but destroying it is inappropriate anyway: the user created it, so
the user should be able to hold on to it as long as he likes.  We
don't destroy it on other errors.  Screwed up in commit 5105b1d.

Stop reading instead.

Also note QEMU's behavior in ivshmem-spec.txt.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <1458066895-20632-16-git-send-email-armbru@redhat.com>

diff --git a/docs/specs/ivshmem-spec.txt b/docs/specs/ivshmem-spec.txt
index 0e9185a04b4f8c43156d6b828f8171f2948aabb6..0cd63adff0035b49aef911bdb4443246214929ad 100644 (file)
--- a/docs/specs/ivshmem-spec.txt
+++ b/docs/specs/ivshmem-spec.txt
@@ -187,6 +187,9 @@ Each message consists of a single 8 byte little-endian signed number,
 and may be accompanied by a file descriptor via SCM_RIGHTS.  Both
 client and server close the connection on error.
 
+Note: QEMU currently doesn't close the connection right on error, but
+only when the character device is destroyed.
+
 On connect, the server sends the following messages in order:
 
 1. The protocol version number, currently zero.  The client should

diff --git a/hw/misc/ivshmem.c b/hw/misc/ivshmem.c
index 8356399092e3b951bbb2953a12bcd924a36098b2..0ac0238c7f03b8ed9e899784e2620184b6624601 100644 (file)
--- a/hw/misc/ivshmem.c
+++ b/hw/misc/ivshmem.c
@@ -708,8 +708,7 @@ static void ivshmem_check_version(void *opaque, const uint8_t * buf, int size)
     if (tmp != -1 || version != IVSHMEM_PROTOCOL_VERSION) {
         fprintf(stderr, "incompatible version, you are connecting to a ivshmem-"
                 "server using a different protocol please check your setup\n");
-        qemu_chr_delete(s->server_chr);
-        s->server_chr = NULL;
+        qemu_chr_add_handlers(s->server_chr, NULL, NULL, NULL, s);
         return;
     }