cxgb3 - Safeguard TCAM size usage

Ensure that the TCAM active region size is at least 16.

Signed-off-by: Divy Le Ray <divy@chelsio.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/net/cxgb3/cxgb3_offload.c b/drivers/net/cxgb3/cxgb3_offload.c
index f6ed033efb56..eed7a48e3111 100644
--- a/drivers/net/cxgb3/cxgb3_offload.c
+++ b/drivers/net/cxgb3/cxgb3_offload.c
@@ -553,7 +553,9 @@ int cxgb3_alloc_atid(struct t3cdev *tdev, struct cxgb3_client *client,
         struct tid_info *t = &(T3C_DATA(tdev))->tid_maps;
 
         spin_lock_bh(&t->atid_lock);
-        if (t->afree) {
+        if (t->afree &&
+            t->atids_in_use + atomic_read(&t->tids_in_use) + MC5_MIN_TIDS <=
+            t->ntids) {
                 union active_open_entry *p = t->afree;
 
                 atid = (p - t->atid_tab) + t->atid_base;