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vchan: fix multiple server instances from single process

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Use new u2mfn_fd for each ring_init call - each open fd to u2mfn is capable to
do only one u2mfn_alloc_kpage, so it can't be reused at the next ring_init.
This commit is contained in:
Marek Marczykowski 2012-11-03 01:49:50 +01:00
parent debcf6d24a
commit eea3aa3b72
1 changed files with 6 additions and 2 deletions
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8
vchan/init.c
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@ -92,6 +92,7 @@ static int ring_init(struct libvchan *ctrl)
static int ring_init(struct libvchan *ctrl)
{
int mfn;
int u2mfn_fd;
struct vchan_interface *ring;
#ifdef CONFIG_STUBDOM
ring = (struct vchan_interface *) memalign(XC_PAGE_SIZE, sizeof(*ring));
@ -102,12 +103,15 @@ static int ring_init(struct libvchan *ctrl)
mfn = virtual_to_mfn(ring);
#else
ring = (struct vchan_interface *) u2mfn_alloc_kpage ();
u2mfn_fd = u2mfn_get_fd();
if (u2mfn_fd < 0)
return -1;
ring = (struct vchan_interface *) u2mfn_alloc_kpage_with_fd (u2mfn_fd);
if (ring == MAP_FAILED)
return -1;
if (u2mfn_get_last_mfn (&mfn) < 0)
if (u2mfn_get_last_mfn_with_fd (u2mfn_fd, &mfn) < 0)
return -1;
#endif