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iw_cxgb4: block module unload until all ep resources are released

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Otherwise an endpoint can be still closing down causing a touch
after free crash.  Also WARN_ON if ulps have failed to destroy
various resources during device removal.

Fixes: ad61a4c7a9 ("iw_cxgb4: don't block in destroy_qp awaiting the last deref")
Reviewed-by: Sagi Grimberg <sagi@grimbrg.me>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
This commit is contained in:
Steve Wise 2016-09-01 06:44:52 -07:00 committed by Sagi Grimberg
parent 609e941a6b
commit 37eb816c08
3 changed files with 8 additions and 0 deletions
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2
drivers/infiniband/hw/cxgb4/cm.c
View File

@ -314,6 +314,8 @@ static void remove_ep_tid(struct c4iw_ep *ep)
spin_lock_irqsave(&ep->com.dev->lock, flags);
_remove_handle(ep->com.dev, &ep->com.dev->hwtid_idr, ep->hwtid, 0);
if (idr_is_empty(&ep->com.dev->hwtid_idr))
wake_up(&ep->com.dev->wait);
spin_unlock_irqrestore(&ep->com.dev->lock, flags);
}

5
drivers/infiniband/hw/cxgb4/device.c
View File

@ -872,9 +872,13 @@ static void c4iw_rdev_close(struct c4iw_rdev *rdev)
static void c4iw_dealloc(struct uld_ctx *ctx)
{
c4iw_rdev_close(&ctx->dev->rdev);
WARN_ON_ONCE(!idr_is_empty(&ctx->dev->cqidr));
idr_destroy(&ctx->dev->cqidr);
WARN_ON_ONCE(!idr_is_empty(&ctx->dev->qpidr));
idr_destroy(&ctx->dev->qpidr);
WARN_ON_ONCE(!idr_is_empty(&ctx->dev->mmidr));
idr_destroy(&ctx->dev->mmidr);
wait_event(ctx->dev->wait, idr_is_empty(&ctx->dev->hwtid_idr));
idr_destroy(&ctx->dev->hwtid_idr);
idr_destroy(&ctx->dev->stid_idr);
idr_destroy(&ctx->dev->atid_idr);
@ -992,6 +996,7 @@ static struct c4iw_dev *c4iw_alloc(const struct cxgb4_lld_info *infop)
mutex_init(&devp->rdev.stats.lock);
mutex_init(&devp->db_mutex);
INIT_LIST_HEAD(&devp->db_fc_list);
init_waitqueue_head(&devp->wait);
devp->avail_ird = devp->rdev.lldi.max_ird_adapter;
if (c4iw_debugfs_root) {

1
drivers/infiniband/hw/cxgb4/iw_cxgb4.h
View File

@ -263,6 +263,7 @@ struct c4iw_dev {
struct idr stid_idr;
struct list_head db_fc_list;
u32 avail_ird;
wait_queue_head_t wait;
};
static inline struct c4iw_dev *to_c4iw_dev(struct ib_device *ibdev)