From: Christof Schmitt <christof.schmitt@xxxxxxxxxx>
Fix the handling of the request list in the error path:
- Use irqsave for the lock as in the good path.
- Before removing the request, check if it is still in the list, a
call to dismiss_all might have changed the list in between.
- zfcp_qdio_send does not change the queue counters on failure,
trying revert something is wrong, so remove this.
Signed-off-by: Christof Schmitt <christof.schmitt@xxxxxxxxxx>
Signed-off-by: Swen Schillig <swen@xxxxxxxxxxxx>
---
drivers/s390/scsi/zfcp_fsf.c | 17 ++++++-----------
1 file changed, 6 insertions(+), 11 deletions(-)
--- a/drivers/s390/scsi/zfcp_fsf.c 2008-11-04 14:44:19.000000000 +0100
+++ b/drivers/s390/scsi/zfcp_fsf.c 2008-11-04 14:44:22.000000000 +0100
@@ -770,7 +770,6 @@ static struct zfcp_fsf_req *zfcp_fsf_req
static int zfcp_fsf_req_send(struct zfcp_fsf_req *req)
{
struct zfcp_adapter *adapter = req->adapter;
- struct zfcp_qdio_queue *req_q = &adapter->req_q;
unsigned long flags;
int idx;
@@ -780,19 +779,15 @@ static int zfcp_fsf_req_send(struct zfcp
list_add_tail(&req->list, &adapter->req_list[idx]);
spin_unlock_irqrestore(&adapter->req_list_lock, flags);
- req->qdio_outb_usage = atomic_read(&req_q->count);
+ req->qdio_outb_usage = atomic_read(&adapter->req_q.count);
req->issued = get_clock();
if (zfcp_qdio_send(req)) {
- /* Queues are down..... */
del_timer(&req->timer);
- spin_lock(&adapter->req_list_lock);
- zfcp_reqlist_remove(adapter, req);
- spin_unlock(&adapter->req_list_lock);
- /* undo changes in request queue made for this request */
- atomic_add(req->sbal_number, &req_q->count);
- req_q->first -= req->sbal_number;
- req_q->first += QDIO_MAX_BUFFERS_PER_Q;
- req_q->first %= QDIO_MAX_BUFFERS_PER_Q; /* wrap */
+ spin_lock_irqsave(&adapter->req_list_lock, flags);
+ /* lookup request again, list might have changed */
+ if (zfcp_reqlist_find_safe(adapter, req))
+ zfcp_reqlist_remove(adapter, req);
+ spin_unlock_irqrestore(&adapter->req_list_lock, flags);
zfcp_erp_adapter_reopen(adapter, 0, 116, req);
return -EIO;
}
--
--
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