From 4db62d4786e946e6fc8c2bb1f9201508f7f46c41 Mon Sep 17 00:00:00 2001
From: Mike Marciniszyn <mike.marciniszyn@qlogic.org>
Date: Mon, 10 Jan 2011 17:42:23 -0800
Subject: [PATCH] IB/qib: Fix refcount leak in lkey/rkey validation
The mr optimization introduced a reference count leak on an exception
test. The lock/refcount manipulation is moved down and the problematic
exception test now calls bail to insure that the lock is released.
Additional fixes as suggested by Ralph Campbell <ralph.campbell@qlogic.org>:
- reduce lock scope of dma regions
- use explicit values on returns vs. automatic ret value
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@qlogic.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
---
drivers/infiniband/hw/qib/qib_keys.c | 30 +++++++++++++---------------
1 file changed, 14 insertions(+), 16 deletions(-)
diff --git a/drivers/infiniband/hw/qib/qib_keys.c b/drivers/infiniband/hw/qib/qib_keys.c
index 756d16098e73..8fd19a47df0c 100644
--- a/drivers/infiniband/hw/qib/qib_keys.c
+++ b/drivers/infiniband/hw/qib/qib_keys.c
@@ -136,7 +136,6 @@ int qib_lkey_ok(struct qib_lkey_table *rkt, struct qib_pd *pd,
struct qib_mregion *mr;
unsigned n, m;
size_t off;
- int ret = 0;
unsigned long flags;
/*
@@ -152,27 +151,28 @@ int qib_lkey_ok(struct qib_lkey_table *rkt, struct qib_pd *pd,
if (!dev->dma_mr)
goto bail;
atomic_inc(&dev->dma_mr->refcount);
+ spin_unlock_irqrestore(&rkt->lock, flags);
+
isge->mr = dev->dma_mr;
isge->vaddr = (void *) sge->addr;
isge->length = sge->length;
isge->sge_length = sge->length;
isge->m = 0;
isge->n = 0;
- spin_unlock_irqrestore(&rkt->lock, flags);
goto ok;
}
mr = rkt->table[(sge->lkey >> (32 - ib_qib_lkey_table_size))];
if (unlikely(mr == NULL || mr->lkey != sge->lkey ||
mr->pd != &pd->ibpd))
goto bail;
- atomic_inc(&mr->refcount);
- spin_unlock_irqrestore(&rkt->lock, flags);
off = sge->addr - mr->user_base;
if (unlikely(sge->addr < mr->user_base ||
off + sge->length > mr->length ||
(mr->access_flags & acc) != acc))
- return ret;
+ goto bail;
+ atomic_inc(&mr->refcount);
+ spin_unlock_irqrestore(&rkt->lock, flags);
off += mr->offset;
if (mr->page_shift) {
@@ -206,11 +206,10 @@ int qib_lkey_ok(struct qib_lkey_table *rkt, struct qib_pd *pd,
isge->m = m;
isge->n = n;
ok:
- ret = 1;
- return ret;
+ return 1;
bail:
spin_unlock_irqrestore(&rkt->lock, flags);
- return ret;
+ return 0;
}
/**
@@ -231,7 +230,6 @@ int qib_rkey_ok(struct qib_qp *qp, struct qib_sge *sge,
struct qib_mregion *mr;
unsigned n, m;
size_t off;
- int ret = 0;
unsigned long flags;
/*
@@ -248,26 +246,27 @@ int qib_rkey_ok(struct qib_qp *qp, struct qib_sge *sge,
if (!dev->dma_mr)
goto bail;
atomic_inc(&dev->dma_mr->refcount);
+ spin_unlock_irqrestore(&rkt->lock, flags);
+
sge->mr = dev->dma_mr;
sge->vaddr = (void *) vaddr;
sge->length = len;
sge->sge_length = len;
sge->m = 0;
sge->n = 0;
- spin_unlock_irqrestore(&rkt->lock, flags);
goto ok;
}
mr = rkt->table[(rkey >> (32 - ib_qib_lkey_table_size))];
if (unlikely(mr == NULL || mr->lkey != rkey || qp->ibqp.pd != mr->pd))
goto bail;
- atomic_inc(&mr->refcount);
- spin_unlock_irqrestore(&rkt->lock, flags);
off = vaddr - mr->iova;
if (unlikely(vaddr < mr->iova || off + len > mr->length ||
(mr->access_flags & acc) == 0))
- return ret;
+ goto bail;
+ atomic_inc(&mr->refcount);
+ spin_unlock_irqrestore(&rkt->lock, flags);
off += mr->offset;
if (mr->page_shift) {
@@ -301,11 +300,10 @@ int qib_rkey_ok(struct qib_qp *qp, struct qib_sge *sge,
sge->m = m;
sge->n = n;
ok:
- ret = 1;
- return ret;
+ return 1;
bail:
spin_unlock_irqrestore(&rkt->lock, flags);
- return ret;
+ return 0;
}
/*