s390/qdio: rework BUG's and WARN_ON's

Remove or replace BUG/BUG_ON where possible and convert WARN_ON
to WARN_ON_ONCE if they can occur freqeuently as pointed out by:
https://lkml.org/lkml/2012/9/27/461

Checks have been removed if:
- the error condition leads to a hardware error which gets logged
  and in most cases stops the device
- the error condition is a null pointer access
- the error condition is just pointless or already handled at
  another location

Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

3 files changed, 12 insertions, 46 deletions

diff --git a/drivers/s390/cio/qdio_main.c b/drivers/s390/cio/qdio_main.c
index e06fa03ea1e4..1671d3461f29 100644
--- a/drivers/s390/cio/qdio_main.c
+++ b/drivers/s390/cio/qdio_main.c
@@ -129,7 +129,6 @@ static int qdio_do_eqbs(struct qdio_q *q, unsigned char *state,
         int rc, tmp_count = count, tmp_start = start, nr = q->nr, retried = 0;
         unsigned int ccq = 0;
 
-        BUG_ON(!q->irq_ptr->sch_token);
         qperf_inc(q, eqbs);
 
         if (!q->is_input_q)
@@ -147,7 +146,6 @@ again:
         }
 
         if (rc == 2) {
-                BUG_ON(tmp_count == count);
                 qperf_inc(q, eqbs_partial);
                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS part:%02x",
                         tmp_count);
@@ -189,8 +187,6 @@ static int qdio_do_sqbs(struct qdio_q *q, unsigned char state, int start,
 
         if (!count)
                 return 0;
-
-        BUG_ON(!q->irq_ptr->sch_token);
         qperf_inc(q, sqbs);
 
         if (!q->is_input_q)
@@ -199,7 +195,7 @@ again:
         ccq = do_sqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count);
         rc = qdio_check_ccq(q, ccq);
         if (!rc) {
-                WARN_ON(tmp_count);
+                WARN_ON_ONCE(tmp_count);
                 return count - tmp_count;
         }
 
@@ -224,9 +220,6 @@ static inline int get_buf_states(struct qdio_q *q, unsigned int bufnr,
         unsigned char __state = 0;
         int i;
 
-        BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK);
-        BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q);
-
         if (is_qebsm(q))
                 return qdio_do_eqbs(q, state, bufnr, count, auto_ack);
 
@@ -258,9 +251,6 @@ static inline int set_buf_states(struct qdio_q *q, int bufnr,
 {
         int i;
 
-        BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK);
-        BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q);
-
         if (is_qebsm(q))
                 return qdio_do_sqbs(q, state, bufnr, count);
 
@@ -345,7 +335,6 @@ again:
 
         /* hipersocket busy condition */
         if (unlikely(*busy_bit)) {
-                WARN_ON(queue_type(q) != QDIO_IQDIO_QFMT || cc != 2);
                 retries++;
 
                 if (!start_time) {
@@ -559,7 +548,7 @@ static int get_inbound_buffer_frontier(struct qdio_q *q)
                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop");
                 break;
         default:
-                BUG();
+                WARN_ON_ONCE(1);
         }
 out:
         return q->first_to_check;
@@ -678,12 +667,10 @@ static inline void qdio_handle_aobs(struct qdio_q *q, int start, int count)
                         if (aob == NULL)
                                 continue;
 
-                        BUG_ON(q->u.out.sbal_state == NULL);
                         q->u.out.sbal_state[b].flags |=
                                 QDIO_OUTBUF_STATE_FLAG_PENDING;
                         q->u.out.aobs[b] = NULL;
                 } else if (state == SLSB_P_OUTPUT_EMPTY) {
-                        BUG_ON(q->u.out.sbal_state == NULL);
                         q->u.out.sbal_state[b].aob = NULL;
                 }
                 b = next_buf(b);
@@ -703,12 +690,11 @@ static inline unsigned long qdio_aob_for_buffer(struct qdio_output_q *q,
                 q->aobs[bufnr] = aob;
         }
         if (q->aobs[bufnr]) {
-                BUG_ON(q->sbal_state == NULL);
                 q->sbal_state[bufnr].flags = QDIO_OUTBUF_STATE_FLAG_NONE;
                 q->sbal_state[bufnr].aob = q->aobs[bufnr];
                 q->aobs[bufnr]->user1 = (u64) q->sbal_state[bufnr].user;
                 phys_aob = virt_to_phys(q->aobs[bufnr]);
-                BUG_ON(phys_aob & 0xFF);
+                WARN_ON_ONCE(phys_aob & 0xFF);
         }
 
 out:
@@ -809,8 +795,6 @@ static int get_outbound_buffer_frontier(struct qdio_q *q)
                 goto out;
 
         switch (state) {
-        case SLSB_P_OUTPUT_PENDING:
-                BUG();
         case SLSB_P_OUTPUT_EMPTY:
                 /* the adapter got it */
                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr,
@@ -840,7 +824,7 @@ static int get_outbound_buffer_frontier(struct qdio_q *q)
         case SLSB_P_OUTPUT_HALTED:
                 break;
         default:
-                BUG();
+                WARN_ON_ONCE(1);
         }
 
 out:
@@ -912,7 +896,7 @@ retry:
 static void __qdio_outbound_processing(struct qdio_q *q)
 {
         qperf_inc(q, tasklet_outbound);
-        BUG_ON(atomic_read(&q->nr_buf_used) < 0);
+        WARN_ON_ONCE(atomic_read(&q->nr_buf_used) < 0);
 
         if (qdio_outbound_q_moved(q))
                 qdio_kick_handler(q);
@@ -1138,16 +1122,10 @@ void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
                 irq_ptr->perf_stat.qdio_int++;
 
         if (IS_ERR(irb)) {
-                switch (PTR_ERR(irb)) {
-                case -EIO:
-                        DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no);
-                        qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
-                        wake_up(&cdev->private->wait_q);
-                        return;
-                default:
-                        WARN_ON(1);
-                        return;
-                }
+                DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no);
+                qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
+                wake_up(&cdev->private->wait_q);
+                return;
         }
         qdio_irq_check_sense(irq_ptr, irb);
         cstat = irb->scsw.cmd.cstat;
@@ -1173,7 +1151,7 @@ void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
         case QDIO_IRQ_STATE_STOPPED:
                 break;
         default:
-                WARN_ON(1);
+                WARN_ON_ONCE(1);
         }
         wake_up(&cdev->private->wait_q);
 }
@@ -1227,7 +1205,7 @@ int qdio_shutdown(struct ccw_device *cdev, int how)
         if (!irq_ptr)
                 return -ENODEV;
 
-        BUG_ON(irqs_disabled());
+        WARN_ON_ONCE(irqs_disabled());
         DBF_EVENT("qshutdown:%4x", cdev->private->schid.sch_no);
 
         mutex_lock(&irq_ptr->setup_mutex);
@@ -1358,7 +1336,6 @@ int qdio_allocate(struct qdio_initialize *init_data)
         irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
         if (!irq_ptr->qdr)
                 goto out_rel;
-        WARN_ON((unsigned long)irq_ptr->qdr & 0xfff);
 
         if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs,
                              init_data->no_output_qs))
@@ -1597,9 +1574,7 @@ static int handle_inbound(struct qdio_q *q, unsigned int callflags,
 
 set:
         count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count);
-
         used = atomic_add_return(count, &q->nr_buf_used) - count;
-        BUG_ON(used + count > QDIO_MAX_BUFFERS_PER_Q);
 
         if (need_siga_in(q))
                 return qdio_siga_input(q);
@@ -1624,7 +1599,6 @@ static int handle_outbound(struct qdio_q *q, unsigned int callflags,
 
         count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count);
         used = atomic_add_return(count, &q->nr_buf_used);
-        BUG_ON(used > QDIO_MAX_BUFFERS_PER_Q);
 
         if (used == QDIO_MAX_BUFFERS_PER_Q)
                 qperf_inc(q, outbound_queue_full);
@@ -1678,7 +1652,6 @@ int do_QDIO(struct ccw_device *cdev, unsigned int callflags,
 {
         struct qdio_irq *irq_ptr;
 
-
         if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q)
                 return -EINVAL;
 
@@ -1721,8 +1694,6 @@ int qdio_start_irq(struct ccw_device *cdev, int nr)
                 return -ENODEV;
         q = irq_ptr->input_qs[nr];
 
-        WARN_ON(queue_irqs_enabled(q));
-
         clear_nonshared_ind(irq_ptr);
         qdio_stop_polling(q);
         clear_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state);
@@ -1769,7 +1740,6 @@ int qdio_get_next_buffers(struct ccw_device *cdev, int nr, int *bufnr,
         if (!irq_ptr)
                 return -ENODEV;
         q = irq_ptr->input_qs[nr];
-        WARN_ON(queue_irqs_enabled(q));
 
         /*
          * Cannot rely on automatic sync after interrupt since queues may
diff --git a/drivers/s390/cio/qdio_setup.c b/drivers/s390/cio/qdio_setup.c
index 6c973db14983..6559564ebe36 100644
--- a/drivers/s390/cio/qdio_setup.c
+++ b/drivers/s390/cio/qdio_setup.c
@@ -140,10 +140,8 @@ static void setup_storage_lists(struct qdio_q *q, struct qdio_irq *irq_ptr,
         q->sl = (struct sl *)((char *)q->slib + PAGE_SIZE / 2);
 
         /* fill in sbal */
-        for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++) {
+        for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
                 q->sbal[j] = *sbals_array++;
-                BUG_ON((unsigned long)q->sbal[j] & 0xff);
-        }
 
         /* fill in slib */
         if (i > 0) {
diff --git a/drivers/s390/cio/qdio_thinint.c b/drivers/s390/cio/qdio_thinint.c
index 2e060088fa87..bdb394b066fc 100644
--- a/drivers/s390/cio/qdio_thinint.c
+++ b/drivers/s390/cio/qdio_thinint.c
@@ -73,7 +73,6 @@ static void put_indicator(u32 *addr)
 void tiqdio_add_input_queues(struct qdio_irq *irq_ptr)
 {
         mutex_lock(&tiq_list_lock);
-        BUG_ON(irq_ptr->nr_input_qs < 1);
         list_add_rcu(&irq_ptr->input_qs[0]->entry, &tiq_list);
         mutex_unlock(&tiq_list_lock);
         xchg(irq_ptr->dsci, 1 << 7);
@@ -83,7 +82,6 @@ void tiqdio_remove_input_queues(struct qdio_irq *irq_ptr)
 {
         struct qdio_q *q;
 
-        BUG_ON(irq_ptr->nr_input_qs < 1);
         q = irq_ptr->input_qs[0];
         /* if establish triggered an error */
         if (!q || !q->entry.prev || !q->entry.next)