Fix for stack overflow on FC6 and VPM450M.

git-svn-id: http://svn.digium.com/svn/zaptel/branches/1.2@2550 5390a7c7-147a-4af0-8ec9-7488f05a26cb

1 files changed, 9 insertions, 0 deletions

diff --git a/wct4xxp/vpm450m.c b/wct4xxp/vpm450m.c
index a5ee941..925ba76 100644
--- a/wct4xxp/vpm450m.c
+++ b/wct4xxp/vpm450m.c
@@ -407,6 +407,7 @@ struct vpm450m *init_vpm450m(void *wc, int *isalaw, int numspans, const struct f
 	UINT32 ulResult;
 	struct vpm450m *vpm450m;
 	int x,y,law;
+	unsigned long flags;
 	
 	if (!(vpm450m = kmalloc(sizeof(struct vpm450m), GFP_KERNEL)))
 		return NULL;
@@ -475,9 +476,16 @@ struct vpm450m *init_vpm450m(void *wc, int *isalaw, int numspans, const struct f
 		return NULL;
 	}
 
+	/* I don't know what to curse more in this comment, the problems caused by
+	 * the 4K kernel stack limit change or the octasic API for being so darn
+	 * stack unfriendly.  Stupid, stupid, stupid.  So we disable IRQs so we
+	 * don't run the risk of overflowing the stack while we initialize the
+	 * octasic. */
+	local_irq_save(flags);
 	ulResult = Oct6100ChipOpen(vpm450m->pApiInstance, ChipOpen);
 	if (ulResult != cOCT6100_ERR_OK) {
 		printk("Failed to open chip, code %08x!\n", ulResult);
+		local_irq_restore(flags);
 		kfree(vpm450m);
 		kfree(ChipOpen);
 		kfree(ChannelOpen);
@@ -532,6 +540,7 @@ struct vpm450m *init_vpm450m(void *wc, int *isalaw, int numspans, const struct f
 		}
 	}
 
+	local_irq_restore(flags);
 	kfree(ChipOpen);
 	kfree(ChannelOpen);
 	return vpm450m;