Hello Mike Marciniszyn,
The patch 46a80d62e6e0: "IB/qib, staging/rdma/hfi1: add s_hlock for
use in post send" from Feb 14, 2016, leads to the following static
checker warning:
drivers/infiniband/hw/qib/qib_ud.c:395 qib_make_ud_req()
warn: 'irqsave:flags' is sometimes locked here and sometimes unlocked.
drivers/infiniband/hw/qib/qib_ud.c
293 } else {
294 this_cpu_inc(ibp->pmastats->n_unicast_xmit);
295 lid = ah_attr->dlid & ~((1 << ppd->lmc) - 1);
296 if (unlikely(lid == ppd->lid)) {
297 unsigned long flags;
^^^^^
298 /*
299 * If DMAs are in progress, we can't generate
300 * a completion for the loopback packet since
301 * it would be out of order.
302 * XXX Instead of waiting, we could queue a
303 * zero length descriptor so we get a callback.
304 */
305 if (atomic_read(&priv->s_dma_busy)) {
306 qp->s_flags |= RVT_S_WAIT_DMA;
307 goto bail;
308 }
309 qp->s_cur = next_cur;
310 local_irq_save(flags);
^^^^^^^^^^^^^^^^^^^^^
311 spin_unlock_irqrestore(&qp->s_lock, flags);
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Complicated no-op with the IRQ flags.
312 qib_ud_loopback(qp, wqe);
313 spin_lock_irqsave(&qp->s_lock, flags);
^^^^^
We save the flags but then we leave the scope without using them.
314 qib_send_complete(qp, wqe, IB_WC_SUCCESS);
315 goto done;
316 }
317 }
regards,
dan carpenter
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