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RDSRDMA: Fix cleanup of rds_iw_mr_pool 

In the rds_iw_mr_pool struct the free_pinned field keeps track of
memory pinned by free MRs. While this field is incremented properly
upon allocation, it is never decremented upon unmapping. This would
cause the rds_rdma module to crash the kernel upon unloading, by
triggering the BUG_ON in the rds_iw_destroy_mr_pool function.

This change keeps track of the MRs that become unpinned, so that
free_pinned can be decremented appropriately.

Signed-off-by: Jonathan Lallinger <jonathan@ogc.us>
Signed-off-by: Steve Wise <swise@ogc.us>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jonathan Lallinger 2011-09-29 07:58:41 +00:00 committed by David S. Miller
parent 605b91c8f6
commit 85a6488949
1 changed files with 9 additions and 4 deletions
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13
net/rds/iw_rdma.c
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@ -84,7 +84,8 @@ static int rds_iw_map_fastreg(struct rds_iw_mr_pool *pool,
static void rds_iw_free_fastreg(struct rds_iw_mr_pool *pool, struct rds_iw_mr *ibmr);
static unsigned int rds_iw_unmap_fastreg_list(struct rds_iw_mr_pool *pool,
struct list_head *unmap_list,
struct list_head *kill_list);
struct list_head *kill_list,
int *unpinned);
static void rds_iw_destroy_fastreg(struct rds_iw_mr_pool *pool, struct rds_iw_mr *ibmr);
static int rds_iw_get_device(struct rds_sock *rs, struct rds_iw_device **rds_iwdev, struct rdma_cm_id **cm_id)
@ -499,7 +500,7 @@ static int rds_iw_flush_mr_pool(struct rds_iw_mr_pool *pool, int free_all)
LIST_HEAD(unmap_list);
LIST_HEAD(kill_list);
unsigned long flags;
unsigned int nfreed = 0, ncleaned = 0, free_goal;
unsigned int nfreed = 0, ncleaned = 0, unpinned = 0, free_goal;
int ret = 0;
rds_iw_stats_inc(s_iw_rdma_mr_pool_flush);
@ -524,7 +525,8 @@ static int rds_iw_flush_mr_pool(struct rds_iw_mr_pool *pool, int free_all)
* will be destroyed by the unmap function.
*/
if (!list_empty(&unmap_list)) {
ncleaned = rds_iw_unmap_fastreg_list(pool, &unmap_list, &kill_list);
ncleaned = rds_iw_unmap_fastreg_list(pool, &unmap_list,
&kill_list, &unpinned);
/* If we've been asked to destroy all MRs, move those
* that were simply cleaned to the kill list */
if (free_all)
@ -548,6 +550,7 @@ static int rds_iw_flush_mr_pool(struct rds_iw_mr_pool *pool, int free_all)
spin_unlock_irqrestore(&pool->list_lock, flags);
}
atomic_sub(unpinned, &pool->free_pinned);
atomic_sub(ncleaned, &pool->dirty_count);
atomic_sub(nfreed, &pool->item_count);
@ -828,7 +831,8 @@ static void rds_iw_free_fastreg(struct rds_iw_mr_pool *pool,
static unsigned int rds_iw_unmap_fastreg_list(struct rds_iw_mr_pool *pool,
struct list_head *unmap_list,
struct list_head *kill_list)
struct list_head *kill_list,
int *unpinned)
{
struct rds_iw_mapping *mapping, *next;
unsigned int ncleaned = 0;
@ -855,6 +859,7 @@ static unsigned int rds_iw_unmap_fastreg_list(struct rds_iw_mr_pool *pool,
spin_lock_irqsave(&pool->list_lock, flags);
list_for_each_entry_safe(mapping, next, unmap_list, m_list) {
*unpinned += mapping->m_sg.len;
list_move(&mapping->m_list, &laundered);
ncleaned++;
}