From 513251fe25d304d1ca628c581bd0cc0422de150a Mon Sep 17 00:00:00 2001 From: Julian Wiedmann Date: Mon, 15 Nov 2021 08:28:08 +0100 Subject: s390/qdio: clarify handler logic for qdio_handle_activate_check() qdio_handle_activate_check() tries to re-use one of the queue-specific handlers to report that the ACTIVATE ccw has been terminated. But the logic to select that handler is overly complex - in practice both qdio drivers have at least one Input Queue, so we never take the other paths. Make things more obvious by removing this unused code, and clearly spelling out that we re-use the Input Handler for generic error reporting. This also paves the way for a world without queue-specific error handlers. Signed-off-by: Julian Wiedmann Reviewed-by: Benjamin Block Signed-off-by: Heiko Carstens --- drivers/s390/cio/qdio.h | 1 + drivers/s390/cio/qdio_main.c | 25 +++++++++++-------------- drivers/s390/cio/qdio_setup.c | 1 + 3 files changed, 13 insertions(+), 14 deletions(-) (limited to 'drivers/s390/cio') diff --git a/drivers/s390/cio/qdio.h b/drivers/s390/cio/qdio.h index 152c032e74d4..5ea6249d8180 100644 --- a/drivers/s390/cio/qdio.h +++ b/drivers/s390/cio/qdio.h @@ -240,6 +240,7 @@ struct qdio_irq { struct qdio_ssqd_desc ssqd_desc; void (*orig_handler) (struct ccw_device *, unsigned long, struct irb *); + qdio_handler_t (*error_handler); int perf_stat_enabled; diff --git a/drivers/s390/cio/qdio_main.c b/drivers/s390/cio/qdio_main.c index 3e586e460f91..35a32240b4ce 100644 --- a/drivers/s390/cio/qdio_main.c +++ b/drivers/s390/cio/qdio_main.c @@ -654,24 +654,18 @@ static void qdio_handle_activate_check(struct qdio_irq *irq_ptr, unsigned long intparm, int cstat, int dstat) { - struct qdio_q *q; + unsigned int first_to_check = 0; DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no); DBF_ERROR("intp :%lx", intparm); DBF_ERROR("ds: %2x cs:%2x", dstat, cstat); - if (irq_ptr->nr_input_qs) { - q = irq_ptr->input_qs[0]; - } else if (irq_ptr->nr_output_qs) { - q = irq_ptr->output_qs[0]; - } else { - dump_stack(); - goto no_handler; - } + /* zfcp wants this: */ + if (irq_ptr->nr_input_qs) + first_to_check = irq_ptr->input_qs[0]->first_to_check; - q->handler(irq_ptr->cdev, QDIO_ERROR_ACTIVATE, 0, q->first_to_check, - 0, irq_ptr->int_parm); -no_handler: + irq_ptr->error_handler(irq_ptr->cdev, QDIO_ERROR_ACTIVATE, 0, + first_to_check, 0, irq_ptr->int_parm); qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED); /* * In case of z/VM LGR (Live Guest Migration) QDIO recovery will happen. @@ -996,8 +990,11 @@ int qdio_establish(struct ccw_device *cdev, init_data->no_output_qs > irq_ptr->max_output_qs) return -EINVAL; - if ((init_data->no_input_qs && !init_data->input_handler) || - (init_data->no_output_qs && !init_data->output_handler)) + /* Needed as error_handler: */ + if (!init_data->input_handler) + return -EINVAL; + + if (init_data->no_output_qs && !init_data->output_handler) return -EINVAL; if (!init_data->input_sbal_addr_array || diff --git a/drivers/s390/cio/qdio_setup.c b/drivers/s390/cio/qdio_setup.c index fd663922d7d5..714878e2acc4 100644 --- a/drivers/s390/cio/qdio_setup.c +++ b/drivers/s390/cio/qdio_setup.c @@ -362,6 +362,7 @@ void qdio_setup_irq(struct qdio_irq *irq_ptr, struct qdio_initialize *init_data) irq_ptr->debugfs_dev = NULL; irq_ptr->sch_token = irq_ptr->perf_stat_enabled = 0; irq_ptr->state = QDIO_IRQ_STATE_INACTIVE; + irq_ptr->error_handler = init_data->input_handler; irq_ptr->int_parm = init_data->int_parm; irq_ptr->nr_input_qs = init_data->no_input_qs; -- cgit v1.2.3-59-g8ed1b