s390/qdio: put thinint indicator after early error

[ Upstream commit 75e82bec6b2622c6f455b7a543fb5476a5d0eed7 ]

qdio_establish() calls qdio_setup_thinint() via qdio_setup_irq().
If the subsequent qdio_establish_thinint() fails, we miss to put the
DSCI again. Thus the DSCI isn't available for re-use. Given enough of
such errors, we could end up with having only the shared DSCI available.

Merge qdio_setup_thinint() into qdio_establish_thinint(), and deal with
such an error internally.

Fixes: 779e6e1c724d ("[S390] qdio: new qdio driver.")
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Reviewed-by: Benjamin Block <bblock@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/s390/cio/qdio.h b/drivers/s390/cio/qdio.h
index a58b45d..3b0a448 100644 (file)
--- a/drivers/s390/cio/qdio.h
+++ b/drivers/s390/cio/qdio.h
@@ -372,7 +372,6 @@ static inline int multicast_outbound(struct qdio_q *q)
 extern u64 last_ai_time;
 
 /* prototypes for thin interrupt */
-void qdio_setup_thinint(struct qdio_irq *irq_ptr);
 int qdio_establish_thinint(struct qdio_irq *irq_ptr);
 void qdio_shutdown_thinint(struct qdio_irq *irq_ptr);
 void tiqdio_add_input_queues(struct qdio_irq *irq_ptr);

diff --git a/drivers/s390/cio/qdio_setup.c b/drivers/s390/cio/qdio_setup.c
index ee0b3c5..9dc56aa 100644 (file)
--- a/drivers/s390/cio/qdio_setup.c
+++ b/drivers/s390/cio/qdio_setup.c
@@ -479,7 +479,6 @@ int qdio_setup_irq(struct qdio_initialize *init_data)
        setup_queues(irq_ptr, init_data);
 
        setup_qib(irq_ptr, init_data);
-       qdio_setup_thinint(irq_ptr);
        set_impl_params(irq_ptr, init_data->qib_param_field_format,
                        init_data->qib_param_field,
                        init_data->input_slib_elements,

diff --git a/drivers/s390/cio/qdio_thinint.c b/drivers/s390/cio/qdio_thinint.c
index 93ee067..ddf780b 100644 (file)
--- a/drivers/s390/cio/qdio_thinint.c
+++ b/drivers/s390/cio/qdio_thinint.c
@@ -268,17 +268,19 @@ int __init tiqdio_register_thinints(void)
 
 int qdio_establish_thinint(struct qdio_irq *irq_ptr)
 {
+       int rc;
+
        if (!is_thinint_irq(irq_ptr))
                return 0;
-       return set_subchannel_ind(irq_ptr, 0);
-}
 
-void qdio_setup_thinint(struct qdio_irq *irq_ptr)
-{
-       if (!is_thinint_irq(irq_ptr))
-               return;
        irq_ptr->dsci = get_indicator();
        DBF_HEX(&irq_ptr->dsci, sizeof(void *));
+
+       rc = set_subchannel_ind(irq_ptr, 0);
+       if (rc)
+               put_indicator(irq_ptr->dsci);
+
+       return rc;
 }
 
 void qdio_shutdown_thinint(struct qdio_irq *irq_ptr)