From: Tom Tucker <[EMAIL PROTECTED]>
The AMSO driver was not thread-safe in the post WR code and had
code that would sleep if the WR post FIFO was full. Since these
functions can be called on interrupt level I changed the sleep to a
udelay.
Signed-off-by: Tom Tucker <[EMAIL PROTECTED]>
---
drivers/infiniband/hw/amso1100/c2_qp.c | 15 +++++++++++----
1 files changed, 11 insertions(+), 4 deletions(-)
diff --git a/drivers/infiniband/hw/amso1100/c2_qp.c
b/drivers/infiniband/hw/amso1100/c2_qp.c
index 1226113..681c130 100644
--- a/drivers/infiniband/hw/amso1100/c2_qp.c
+++ b/drivers/infiniband/hw/amso1100/c2_qp.c
@@ -35,6 +35,7 @@
*
*/
+#include <linux/delay.h>
#include "c2.h"
#include "c2_vq.h"
#include "c2_status.h"
@@ -705,10 +706,8 @@ static inline void c2_activity(struct c2
* cannot get on the bus and the card and system hang in a
* deadlock -- thus the need for this code. [TOT]
*/
- while (readl(c2dev->regs + PCI_BAR0_ADAPTER_HINT) & 0x80000000) {
- set_current_state(TASK_UNINTERRUPTIBLE);
- schedule_timeout(0);
- }
+ while (readl(c2dev->regs + PCI_BAR0_ADAPTER_HINT) & 0x80000000)
+ udelay(10);
__raw_writel(C2_HINT_MAKE(mq_index, shared),
c2dev->regs + PCI_BAR0_ADAPTER_HINT);
@@ -766,6 +765,7 @@ int c2_post_send(struct ib_qp *ibqp, str
struct c2_dev *c2dev = to_c2dev(ibqp->device);
struct c2_qp *qp = to_c2qp(ibqp);
union c2wr wr;
+ unsigned long lock_flags;
int err = 0;
u32 flags;
@@ -881,8 +881,10 @@ int c2_post_send(struct ib_qp *ibqp, str
/*
* Post the puppy!
*/
+ spin_lock_irqsave(&qp->lock, lock_flags);
err = qp_wr_post(&qp->sq_mq, &wr, qp, msg_size);
if (err) {
+ spin_unlock_irqrestore(&qp->lock, lock_flags);
break;
}
@@ -890,6 +892,7 @@ int c2_post_send(struct ib_qp *ibqp, str
* Enqueue mq index to activity FIFO.
*/
c2_activity(c2dev, qp->sq_mq.index, qp->sq_mq.hint_count);
+ spin_unlock_irqrestore(&qp->lock, lock_flags);
ib_wr = ib_wr->next;
}
@@ -905,6 +908,7 @@ int c2_post_receive(struct ib_qp *ibqp,
struct c2_dev *c2dev = to_c2dev(ibqp->device);
struct c2_qp *qp = to_c2qp(ibqp);
union c2wr wr;
+ unsigned long lock_flags;
int err = 0;
if (qp->state > IB_QPS_RTS)
@@ -945,8 +949,10 @@ int c2_post_receive(struct ib_qp *ibqp,
break;
}
+ spin_lock_irqsave(&qp->lock, lock_flags);
err = qp_wr_post(&qp->rq_mq, &wr, qp, qp->rq_mq.msg_size);
if (err) {
+ spin_unlock_irqrestore(&qp->lock, lock_flags);
break;
}
@@ -954,6 +960,7 @@ int c2_post_receive(struct ib_qp *ibqp,
* Enqueue mq index to activity FIFO
*/
c2_activity(c2dev, qp->rq_mq.index, qp->rq_mq.hint_count);
+ spin_unlock_irqrestore(&qp->lock, lock_flags);
ib_wr = ib_wr->next;
}
-
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