This is the second version, with a fault in the previous version fixed.
Signed-off-by: Hillf Danton <dhillf@xxxxxxxxx>
---
--- a/drivers/scsi/libfc/fc_exch.c 2010-09-13 07:07:38.000000000 +0800
+++ b/drivers/scsi/libfc/fc_exch.c 2010-10-26 21:24:22.000000000 +0800
@@ -67,6 +67,11 @@ struct workqueue_struct *fc_exch_workque
struct fc_exch_pool {
u16 next_index;
u16 total_exches;
+
+ /* stats info against memory leakage */
+ atomic_t allocated;
+ atomic_t released;
+
spinlock_t lock;
struct list_head ex_list;
};
@@ -326,6 +331,7 @@ static void fc_exch_release(struct fc_ex
struct fc_exch_mgr *mp;
if (atomic_dec_and_test(&ep->ex_refcnt)) {
+ atomic_inc(&ep->pool->released);
mp = ep->em;
if (ep->destructor)
ep->destructor(&ep->seq, ep->arg);
@@ -688,6 +694,7 @@ static struct fc_exch *fc_exch_em_alloc(
}
pool->next_index = index == mp->pool_max_index ? 0 : index + 1;
+ atomic_inc(&pool->allocated);
fc_exch_hold(ep); /* hold for exch in mp */
spin_lock_init(&ep->ex_lock);
/*
@@ -1699,6 +1706,14 @@ restart:
goto restart;
}
}
+
+ if (atomic_read(&pool->allocated) != atomic_read(&pool->released))
+ printk(KERN_WARNING "libfc: host %u exch pool %p "
+ "allocated %d released %d\n",
+ lport->host->host_no, pool,
+ atomic_read(&pool->allocated),
+ atomic_read(&pool->released));
+
spin_unlock_bh(&pool->lock);
}
--
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