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| author | Keir Fraser <keir.fraser@citrix.com> | 2008-06-18 09:38:11 +0100 |
|---|---|---|
| committer | Keir Fraser <keir.fraser@citrix.com> | 2008-06-18 09:38:11 +0100 |
| commit | 030c31dd18ad7dc1c71d6502c577762e467cdb92 (patch) | |
| tree | ff6fda576fddf5dde8797157eede32d91a78b154 /extras/mini-os/gnttab.c | |
| parent | 5201eb72cb358ddaf500356257e9a1d1827ba84d (diff) | |
| download | xen-030c31dd18ad7dc1c71d6502c577762e467cdb92.tar.gz xen-030c31dd18ad7dc1c71d6502c577762e467cdb92.tar.bz2 xen-030c31dd18ad7dc1c71d6502c577762e467cdb92.zip | |
minios: fix gnttab allocation boundary
The gnttab_sem is already fed during initialization's put_free_entry
loop.
Signed-off-by: Samuel Thibault <samuel.thibault@eu.citrix.com>
Diffstat (limited to 'extras/mini-os/gnttab.c')
| -rw-r--r-- | extras/mini-os/gnttab.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/extras/mini-os/gnttab.c b/extras/mini-os/gnttab.c index d94c28b815..18fd87e29c 100644 --- a/extras/mini-os/gnttab.c +++ b/extras/mini-os/gnttab.c @@ -35,7 +35,7 @@ static grant_ref_t gnttab_list[NR_GRANT_ENTRIES]; #ifdef GNT_DEBUG static char inuse[NR_GRANT_ENTRIES]; #endif -static __DECLARE_SEMAPHORE_GENERIC(gnttab_sem, NR_GRANT_ENTRIES); +static __DECLARE_SEMAPHORE_GENERIC(gnttab_sem, 0); static void put_free_entry(grant_ref_t ref) @@ -60,6 +60,7 @@ get_free_entry(void) down(&gnttab_sem); local_irq_save(flags); ref = gnttab_list[0]; + BUG_ON(ref < NR_RESERVED_ENTRIES || ref >= NR_GRANT_ENTRIES); gnttab_list[0] = gnttab_list[ref]; #ifdef GNT_DEBUG BUG_ON(inuse[ref]); |