Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-27 22:51:35 +00:00
Code Issues Packages Projects Releases Wiki Activity

RDMA/cxgb3: Don't pass irq flags to flush_qp()

Browse Source 
Since flush_qp() is always called with irqs disabled, all the locking
inside flush_qp() and __flush_qp() doesn't need irq save/restore.

Further, passing the flag variable from iwch_modify_qp() is just wrong
and causes a WARN_ON() in local_bh_enable().

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
This commit is contained in:
Steve Wise 2012-03-07 16:48:46 -06:00 committed by Roland Dreier
parent 6b21d18ed5
commit db4106ce63
1 changed files with 20 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

40
drivers/infiniband/hw/cxgb3/iwch_qp.c
View File

@ -803,7 +803,7 @@ int iwch_post_terminate(struct iwch_qp *qhp, struct respQ_msg_t *rsp_msg)
* Assumes qhp lock is held.
*/
static void __flush_qp(struct iwch_qp *qhp, struct iwch_cq *rchp,
struct iwch_cq *schp, unsigned long *flag)
struct iwch_cq *schp)
{
int count;
int flushed;
@ -812,44 +812,44 @@ static void __flush_qp(struct iwch_qp *qhp, struct iwch_cq *rchp,
PDBG("%s qhp %p rchp %p schp %p\n", __func__, qhp, rchp, schp);
/* take a ref on the qhp since we must release the lock */
atomic_inc(&qhp->refcnt);
spin_unlock_irqrestore(&qhp->lock, *flag);
spin_unlock(&qhp->lock);
/* locking hierarchy: cq lock first, then qp lock. */
spin_lock_irqsave(&rchp->lock, *flag);
spin_lock(&rchp->lock);
spin_lock(&qhp->lock);
cxio_flush_hw_cq(&rchp->cq);
cxio_count_rcqes(&rchp->cq, &qhp->wq, &count);
flushed = cxio_flush_rq(&qhp->wq, &rchp->cq, count);
spin_unlock(&qhp->lock);
spin_unlock_irqrestore(&rchp->lock, *flag);
spin_unlock(&rchp->lock);
if (flushed) {
spin_lock_irqsave(&rchp->comp_handler_lock, *flag);
spin_lock(&rchp->comp_handler_lock);
(*rchp->ibcq.comp_handler)(&rchp->ibcq, rchp->ibcq.cq_context);
spin_unlock_irqrestore(&rchp->comp_handler_lock, *flag);
spin_unlock(&rchp->comp_handler_lock);
}
/* locking hierarchy: cq lock first, then qp lock. */
spin_lock_irqsave(&schp->lock, *flag);
spin_lock(&schp->lock);
spin_lock(&qhp->lock);
cxio_flush_hw_cq(&schp->cq);
cxio_count_scqes(&schp->cq, &qhp->wq, &count);
flushed = cxio_flush_sq(&qhp->wq, &schp->cq, count);
spin_unlock(&qhp->lock);
spin_unlock_irqrestore(&schp->lock, *flag);
spin_unlock(&schp->lock);
if (flushed) {
spin_lock_irqsave(&schp->comp_handler_lock, *flag);
spin_lock(&schp->comp_handler_lock);
(*schp->ibcq.comp_handler)(&schp->ibcq, schp->ibcq.cq_context);
spin_unlock_irqrestore(&schp->comp_handler_lock, *flag);
spin_unlock(&schp->comp_handler_lock);
}
/* deref */
if (atomic_dec_and_test(&qhp->refcnt))
wake_up(&qhp->wait);
spin_lock_irqsave(&qhp->lock, *flag);
spin_lock(&qhp->lock);
}
static void flush_qp(struct iwch_qp *qhp, unsigned long *flag)
static void flush_qp(struct iwch_qp *qhp)
{
struct iwch_cq *rchp, *schp;
@ -859,19 +859,19 @@ static void flush_qp(struct iwch_qp *qhp, unsigned long *flag)
if (qhp->ibqp.uobject) {
cxio_set_wq_in_error(&qhp->wq);
cxio_set_cq_in_error(&rchp->cq);
spin_lock_irqsave(&rchp->comp_handler_lock, *flag);
spin_lock(&rchp->comp_handler_lock);
(*rchp->ibcq.comp_handler)(&rchp->ibcq, rchp->ibcq.cq_context);
spin_unlock_irqrestore(&rchp->comp_handler_lock, *flag);
spin_unlock(&rchp->comp_handler_lock);
if (schp != rchp) {
cxio_set_cq_in_error(&schp->cq);
spin_lock_irqsave(&schp->comp_handler_lock, *flag);
spin_lock(&schp->comp_handler_lock);
(*schp->ibcq.comp_handler)(&schp->ibcq,
schp->ibcq.cq_context);
spin_unlock_irqrestore(&schp->comp_handler_lock, *flag);
spin_unlock(&schp->comp_handler_lock);
}
return;
}
__flush_qp(qhp, rchp, schp, flag);
__flush_qp(qhp, rchp, schp);
}
@ -1030,7 +1030,7 @@ int iwch_modify_qp(struct iwch_dev *rhp, struct iwch_qp *qhp,
break;
case IWCH_QP_STATE_ERROR:
qhp->attr.state = IWCH_QP_STATE_ERROR;
flush_qp(qhp, &flag);
flush_qp(qhp);
break;
default:
ret = -EINVAL;
@ -1078,7 +1078,7 @@ int iwch_modify_qp(struct iwch_dev *rhp, struct iwch_qp *qhp,
}
switch (attrs->next_state) {
case IWCH_QP_STATE_IDLE:
flush_qp(qhp, &flag);
flush_qp(qhp);
qhp->attr.state = IWCH_QP_STATE_IDLE;
qhp->attr.llp_stream_handle = NULL;
put_ep(&qhp->ep->com);
@ -1132,7 +1132,7 @@ err:
free=1;
wake_up(&qhp->wait);
BUG_ON(!ep);
flush_qp(qhp, &flag);
flush_qp(qhp);
out:
spin_unlock_irqrestore(&qhp->lock, flag);