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| author | Andy Grover <andy.grover@oracle.com> | 2010-03-11 13:50:06 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-03-16 21:17:01 -0700 |
| commit | 561c7df63e259203515509a7ad075382a42bff0c (patch) | |
| tree | 80d3d382ba155d4bced37b716dcac0e31062f2c5 /net/rds | |
| parent | 450d06c0208ad195ccd74a7edd11321e316791ad (diff) | |
| download | lwn-561c7df63e259203515509a7ad075382a42bff0c.tar.gz lwn-561c7df63e259203515509a7ad075382a42bff0c.zip | |
RDS: Do not call set_page_dirty() with irqs off
set_page_dirty() unconditionally re-enables interrupts, so
if we call it with irqs off, they will be on after the call,
and that's bad. This patch moves the call after we've re-enabled
interrupts in send_drop_to(), so it's safe.
Also, add BUG_ONs to let us know if we ever do call set_page_dirty
with interrupts off.
Signed-off-by: Andy Grover <andy.grover@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/rds')
| -rw-r--r-- | net/rds/ib_rdma.c | 1 | ||||
| -rw-r--r-- | net/rds/rdma.c | 4 | ||||
| -rw-r--r-- | net/rds/send.c | 14 |
3 files changed, 12 insertions, 7 deletions
diff --git a/net/rds/ib_rdma.c b/net/rds/ib_rdma.c index 65e668defe42..cfb1d904ed00 100644 --- a/net/rds/ib_rdma.c +++ b/net/rds/ib_rdma.c @@ -440,6 +440,7 @@ static void __rds_ib_teardown_mr(struct rds_ib_mr *ibmr) /* FIXME we need a way to tell a r/w MR * from a r/o MR */ + BUG_ON(in_interrupt()); set_page_dirty(page); put_page(page); } diff --git a/net/rds/rdma.c b/net/rds/rdma.c index 4c64daa1f5d5..61b359d9dffd 100644 --- a/net/rds/rdma.c +++ b/net/rds/rdma.c @@ -438,8 +438,10 @@ void rds_rdma_free_op(struct rds_rdma_op *ro) /* Mark page dirty if it was possibly modified, which * is the case for a RDMA_READ which copies from remote * to local memory */ - if (!ro->r_write) + if (!ro->r_write) { + BUG_ON(in_interrupt()); set_page_dirty(page); + } put_page(page); } diff --git a/net/rds/send.c b/net/rds/send.c index 51e2def50b12..4629a0b63bbd 100644 --- a/net/rds/send.c +++ b/net/rds/send.c @@ -507,12 +507,13 @@ EXPORT_SYMBOL_GPL(rds_send_get_message); */ void rds_send_remove_from_sock(struct list_head *messages, int status) { - unsigned long flags = 0; /* silence gcc :P */ + unsigned long flags; struct rds_sock *rs = NULL; struct rds_message *rm; - local_irq_save(flags); while (!list_empty(messages)) { + int was_on_sock = 0; + rm = list_entry(messages->next, struct rds_message, m_conn_item); list_del_init(&rm->m_conn_item); @@ -527,7 +528,7 @@ void rds_send_remove_from_sock(struct list_head *messages, int status) * while we're messing with it. It does not prevent the * message from being removed from the socket, though. */ - spin_lock(&rm->m_rs_lock); + spin_lock_irqsave(&rm->m_rs_lock, flags); if (!test_bit(RDS_MSG_ON_SOCK, &rm->m_flags)) goto unlock_and_drop; @@ -556,21 +557,22 @@ void rds_send_remove_from_sock(struct list_head *messages, int status) notifier->n_status = status; rm->m_rdma_op->r_notifier = NULL; } - rds_message_put(rm); + was_on_sock = 1; rm->m_rs = NULL; } spin_unlock(&rs->rs_lock); unlock_and_drop: - spin_unlock(&rm->m_rs_lock); + spin_unlock_irqrestore(&rm->m_rs_lock, flags); rds_message_put(rm); + if (was_on_sock) + rds_message_put(rm); } if (rs) { rds_wake_sk_sleep(rs); sock_put(rds_rs_to_sk(rs)); } - local_irq_restore(flags); } /* |