[S390] qdio: prevent dsci access without adapter interrupts

A kernel panic may occur during sending or receiving network packets
on a machine without adapter interrupts since commit d36deae.
The bug is triggered by writing to the shared indicator address which
is set to 0 if the machine doesn't have adapter interrupts.

Make the reading and setting of the shared indicator dependent on the
adapter interrupt feature and while at it move the code to the
file containing the adapter interrupt related code.

Thanks to Jan Jaeger for tracking this down.

Reported-by: Jan Jaeger <jan.jaeger@westnet.com.au>
Tested-by: Jan Jaeger <jan.jaeger@westnet.com.au>
Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 46 insertions, 2 deletions

diff --git a/drivers/s390/cio/qdio_thinint.c b/drivers/s390/cio/qdio_thinint.c
index 9d1e7efb5bb5..011eadea3ee4 100644
--- a/drivers/s390/cio/qdio_thinint.c
+++ b/drivers/s390/cio/qdio_thinint.c
@@ -26,6 +26,13 @@
  */
 #define TIQDIO_NR_NONSHARED_IND		63
 #define TIQDIO_NR_INDICATORS		(TIQDIO_NR_NONSHARED_IND + 1)
+#define TIQDIO_SHARED_IND		63
+
+/* device state change indicators */
+struct indicator_t {
+	u32 ind;	/* u32 because of compare-and-swap performance */
+	atomic_t count; /* use count, 0 or 1 for non-shared indicators */
+};
 
 /* list of thin interrupt input queues */
 static LIST_HEAD(tiq_list);
@@ -34,7 +41,7 @@ static DEFINE_MUTEX(tiq_list_lock);
 /* adapter local summary indicator */
 static u8 *tiqdio_alsi;
 
-struct indicator_t *q_indicators;
+static struct indicator_t *q_indicators;
 
 u64 last_ai_time;
 
@@ -90,6 +97,43 @@ void tiqdio_remove_input_queues(struct qdio_irq *irq_ptr)
 	synchronize_rcu();
 }
 
+static inline int has_multiple_inq_on_dsci(struct qdio_irq *irq_ptr)
+{
+	return irq_ptr->nr_input_qs > 1;
+}
+
+static inline int references_shared_dsci(struct qdio_irq *irq_ptr)
+{
+	return irq_ptr->dsci == &q_indicators[TIQDIO_SHARED_IND].ind;
+}
+
+static inline int shared_ind(struct qdio_irq *irq_ptr)
+{
+	return references_shared_dsci(irq_ptr) ||
+		has_multiple_inq_on_dsci(irq_ptr);
+}
+
+void clear_nonshared_ind(struct qdio_irq *irq_ptr)
+{
+	if (!is_thinint_irq(irq_ptr))
+		return;
+	if (shared_ind(irq_ptr))
+		return;
+	xchg(irq_ptr->dsci, 0);
+}
+
+int test_nonshared_ind(struct qdio_irq *irq_ptr)
+{
+	if (!is_thinint_irq(irq_ptr))
+		return 0;
+	if (shared_ind(irq_ptr))
+		return 0;
+	if (*irq_ptr->dsci)
+		return 1;
+	else
+		return 0;
+}
+
 static inline u32 clear_shared_ind(void)
 {
 	if (!atomic_read(&q_indicators[TIQDIO_SHARED_IND].count))
@@ -119,7 +163,7 @@ static inline void tiqdio_call_inq_handlers(struct qdio_irq *irq)
 			q->u.in.queue_start_poll(q->irq_ptr->cdev, q->nr,
 						 q->irq_ptr->int_parm);
 		} else {
-			if (!shared_ind(q))
+			if (!shared_ind(q->irq_ptr))
 				xchg(q->irq_ptr->dsci, 0);
 
 			/*