redonkable/alistair23-linux
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IB/ipath: Don't call spin_lock_irq() from interrupt context

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This patch fixes the problem reported by Bernd Schubert <bs@q-leap.de>
with kernel debug options enabled:

    BUG: at kernel/lockdep.c:1860 trace_hardirqs_on()

This was caused by using spin_lock_irq()/spin_unlock_irq() from
interrupt context.  Fix all the places that might be called from
interrupts to use spin_lock_irqsave()/spin_unlock_irqrestore().

Signed-off-by: Ralph Campbell <ralph.campbell@qlogic.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Ralph Campbell 2007-04-27 11:11:11 -07:00 committed by Roland Dreier
parent b9099ff63c
commit 35ff032e65
1 changed files with 11 additions and 7 deletions
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18
drivers/infiniband/hw/ipath/ipath_rc.c
View file

@ -587,6 +587,7 @@ static void send_rc_ack(struct ipath_qp *qp)
u32 hwords;
struct ipath_ib_header hdr;
struct ipath_other_headers *ohdr;
unsigned long flags;
/* Don't send ACK or NAK if a RDMA read or atomic is pending. */
if (qp->r_head_ack_queue != qp->s_tail_ack_queue)
@ -640,11 +641,11 @@ static void send_rc_ack(struct ipath_qp *qp)
dev->n_rc_qacks++;
queue_ack:
spin_lock_irq(&qp->s_lock);
spin_lock_irqsave(&qp->s_lock, flags);
qp->s_flags |= IPATH_S_ACK_PENDING;
qp->s_nak_state = qp->r_nak_state;
qp->s_ack_psn = qp->r_ack_psn;
spin_unlock_irq(&qp->s_lock);
spin_unlock_irqrestore(&qp->s_lock, flags);
/* Call ipath_do_rc_send() in another thread. */
tasklet_hi_schedule(&qp->s_task);
@ -1294,6 +1295,7 @@ static inline int ipath_rc_rcv_error(struct ipath_ibdev *dev,
struct ipath_ack_entry *e;
u8 i, prev;
int old_req;
unsigned long flags;
if (diff > 0) {
/*
@ -1327,7 +1329,7 @@ static inline int ipath_rc_rcv_error(struct ipath_ibdev *dev,
psn &= IPATH_PSN_MASK;
e = NULL;
old_req = 1;
spin_lock_irq(&qp->s_lock);
spin_lock_irqsave(&qp->s_lock, flags);
for (i = qp->r_head_ack_queue; ; i = prev) {
if (i == qp->s_tail_ack_queue)
old_req = 0;
@ -1425,7 +1427,7 @@ static inline int ipath_rc_rcv_error(struct ipath_ibdev *dev,
* after all the previous RDMA reads and atomics.
*/
if (i == qp->r_head_ack_queue) {
spin_unlock_irq(&qp->s_lock);
spin_unlock_irqrestore(&qp->s_lock, flags);
qp->r_nak_state = 0;
qp->r_ack_psn = qp->r_psn - 1;
goto send_ack;
@ -1443,7 +1445,7 @@ static inline int ipath_rc_rcv_error(struct ipath_ibdev *dev,
tasklet_hi_schedule(&qp->s_task);
unlock_done:
spin_unlock_irq(&qp->s_lock);
spin_unlock_irqrestore(&qp->s_lock, flags);
done:
return 1;
@ -1453,10 +1455,12 @@ send_ack:
static void ipath_rc_error(struct ipath_qp *qp, enum ib_wc_status err)
{
spin_lock_irq(&qp->s_lock);
unsigned long flags;
spin_lock_irqsave(&qp->s_lock, flags);
qp->state = IB_QPS_ERR;
ipath_error_qp(qp, err);
spin_unlock_irq(&qp->s_lock);
spin_unlock_irqrestore(&qp->s_lock, flags);
}
/**