From 673514aff5d797b0cdb3f09097ae0e253b5667c3 Mon Sep 17 00:00:00 2001 From: Stefan Haberland Date: Tue, 12 Sep 2017 17:22:42 +0200 Subject: s390/dasd: fix race during dasd initialization Fix a panic in blk_mq_hctx_has_pending() that is caused by a racy call to blk_mq_run_hw_queues in a dasd function that might get called with the request queue not yet initialized during initialization. Signed-off-by: Stefan Haberland Signed-off-by: Martin Schwidefsky --- drivers/s390/block/dasd.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) (limited to 'drivers') diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c index ea19b4ff87a2..29f35e29d480 100644 --- a/drivers/s390/block/dasd.c +++ b/drivers/s390/block/dasd.c @@ -1644,7 +1644,9 @@ void dasd_generic_handle_state_change(struct dasd_device *device) dasd_schedule_device_bh(device); if (device->block) { dasd_schedule_block_bh(device->block); - blk_mq_run_hw_queues(device->block->request_queue, true); + if (device->block->request_queue) + blk_mq_run_hw_queues(device->block->request_queue, + true); } } EXPORT_SYMBOL_GPL(dasd_generic_handle_state_change); @@ -3759,7 +3761,9 @@ int dasd_generic_path_operational(struct dasd_device *device) dasd_schedule_device_bh(device); if (device->block) { dasd_schedule_block_bh(device->block); - blk_mq_run_hw_queues(device->block->request_queue, true); + if (device->block->request_queue) + blk_mq_run_hw_queues(device->block->request_queue, + true); } if (!device->stopped) @@ -4025,7 +4029,9 @@ int dasd_generic_restore_device(struct ccw_device *cdev) if (device->block) { dasd_schedule_block_bh(device->block); - blk_mq_run_hw_queues(device->block->request_queue, true); + if (device->block->request_queue) + blk_mq_run_hw_queues(device->block->request_queue, + true); } clear_bit(DASD_FLAG_SUSPENDED, &device->flags); -- cgit v1.2.3 From c8b850241559d6bad7e640075e282a83a4ad7ead Mon Sep 17 00:00:00 2001 From: Sebastian Ott Date: Mon, 18 Sep 2017 12:25:22 +0200 Subject: s390/scm_blk: consistently use blk_status_t as error type Fix these warnings found by sparse: drivers/s390/block/scm_blk.c:257:24: warning: incorrect type in assignment (different base types) drivers/s390/block/scm_blk.c:257:24: expected int [signed] drivers/s390/block/scm_blk.c:257:24: got restricted blk_status_t [usertype] error drivers/s390/block/scm_blk.c:420:33: warning: incorrect type in argument 2 (different base types) drivers/s390/block/scm_blk.c:420:33: expected restricted blk_status_t [usertype] error drivers/s390/block/scm_blk.c:420:33: got int [signed] Signed-off-by: Sebastian Ott Reported-by: Heiko Carstens Signed-off-by: Martin Schwidefsky --- drivers/s390/block/scm_blk.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'drivers') diff --git a/drivers/s390/block/scm_blk.c b/drivers/s390/block/scm_blk.c index 2e7fd966c515..eb51893c74a4 100644 --- a/drivers/s390/block/scm_blk.c +++ b/drivers/s390/block/scm_blk.c @@ -249,7 +249,7 @@ static void scm_request_requeue(struct scm_request *scmrq) static void scm_request_finish(struct scm_request *scmrq) { struct scm_blk_dev *bdev = scmrq->bdev; - int *error; + blk_status_t *error; int i; for (i = 0; i < nr_requests_per_io && scmrq->request[i]; i++) { @@ -415,7 +415,7 @@ void scm_blk_irq(struct scm_device *scmdev, void *data, blk_status_t error) static void scm_blk_request_done(struct request *req) { - int *error = blk_mq_rq_to_pdu(req); + blk_status_t *error = blk_mq_rq_to_pdu(req); blk_mq_end_request(req, *error); } @@ -450,7 +450,7 @@ int scm_blk_dev_setup(struct scm_blk_dev *bdev, struct scm_device *scmdev) atomic_set(&bdev->queued_reqs, 0); bdev->tag_set.ops = &scm_mq_ops; - bdev->tag_set.cmd_size = sizeof(int); + bdev->tag_set.cmd_size = sizeof(blk_status_t); bdev->tag_set.nr_hw_queues = nr_requests; bdev->tag_set.queue_depth = nr_requests_per_io * nr_requests; bdev->tag_set.flags = BLK_MQ_F_SHOULD_MERGE; -- cgit v1.2.3 From 55fb7347579017bdb09550b4e8019447340b7004 Mon Sep 17 00:00:00 2001 From: Sebastian Ott Date: Thu, 14 Sep 2017 13:55:22 +0200 Subject: s390/cio: recover from bad paths In some situations we don't receive notification from firmware that a previously unusable channelpath is usable again. Schedule recovery for devices that return from path verification without using all potentially usable paths. The recovery thread will periodically trigger a path verification on the affected devices. Signed-off-by: Sebastian Ott Suggested-by: Peter Oberparleiter Reviewed-by: Peter Oberparleiter Signed-off-by: Martin Schwidefsky --- drivers/s390/cio/device.c | 12 +++++++++--- drivers/s390/cio/device.h | 1 + drivers/s390/cio/device_fsm.c | 12 ++++++++++++ drivers/s390/cio/io_sch.h | 2 ++ 4 files changed, 24 insertions(+), 3 deletions(-) (limited to 'drivers') diff --git a/drivers/s390/cio/device.c b/drivers/s390/cio/device.c index 489b583f263d..e5c32f4b5287 100644 --- a/drivers/s390/cio/device.c +++ b/drivers/s390/cio/device.c @@ -1225,10 +1225,16 @@ static int device_is_disconnected(struct ccw_device *cdev) static int recovery_check(struct device *dev, void *data) { struct ccw_device *cdev = to_ccwdev(dev); + struct subchannel *sch; int *redo = data; spin_lock_irq(cdev->ccwlock); switch (cdev->private->state) { + case DEV_STATE_ONLINE: + sch = to_subchannel(cdev->dev.parent); + if ((sch->schib.pmcw.pam & sch->opm) == sch->vpm) + break; + /* fall through */ case DEV_STATE_DISCONNECTED: CIO_MSG_EVENT(3, "recovery: trigger 0.%x.%04x\n", cdev->private->dev_id.ssid, @@ -1260,7 +1266,7 @@ static void recovery_work_func(struct work_struct *unused) } spin_unlock_irq(&recovery_lock); } else - CIO_MSG_EVENT(4, "recovery: end\n"); + CIO_MSG_EVENT(3, "recovery: end\n"); } static DECLARE_WORK(recovery_work, recovery_work_func); @@ -1274,11 +1280,11 @@ static void recovery_func(unsigned long data) schedule_work(&recovery_work); } -static void ccw_device_schedule_recovery(void) +void ccw_device_schedule_recovery(void) { unsigned long flags; - CIO_MSG_EVENT(4, "recovery: schedule\n"); + CIO_MSG_EVENT(3, "recovery: schedule\n"); spin_lock_irqsave(&recovery_lock, flags); if (!timer_pending(&recovery_timer) || (recovery_phase != 0)) { recovery_phase = 0; diff --git a/drivers/s390/cio/device.h b/drivers/s390/cio/device.h index ec497af99dd8..69cb70f080a5 100644 --- a/drivers/s390/cio/device.h +++ b/drivers/s390/cio/device.h @@ -134,6 +134,7 @@ void ccw_device_set_disconnected(struct ccw_device *cdev); void ccw_device_set_notoper(struct ccw_device *cdev); void ccw_device_set_timeout(struct ccw_device *, int); +void ccw_device_schedule_recovery(void); /* Channel measurement facility related */ void retry_set_schib(struct ccw_device *cdev); diff --git a/drivers/s390/cio/device_fsm.c b/drivers/s390/cio/device_fsm.c index 12016e32e519..f98ea674c3d8 100644 --- a/drivers/s390/cio/device_fsm.c +++ b/drivers/s390/cio/device_fsm.c @@ -476,6 +476,17 @@ static void create_fake_irb(struct irb *irb, int type) } } +static void ccw_device_handle_broken_paths(struct ccw_device *cdev) +{ + struct subchannel *sch = to_subchannel(cdev->dev.parent); + u8 broken_paths = (sch->schib.pmcw.pam & sch->opm) ^ sch->vpm; + + if (broken_paths && (cdev->private->path_broken_mask != broken_paths)) + ccw_device_schedule_recovery(); + + cdev->private->path_broken_mask = broken_paths; +} + void ccw_device_verify_done(struct ccw_device *cdev, int err) { struct subchannel *sch; @@ -508,6 +519,7 @@ callback: memset(&cdev->private->irb, 0, sizeof(struct irb)); } ccw_device_report_path_events(cdev); + ccw_device_handle_broken_paths(cdev); break; case -ETIME: case -EUSERS: diff --git a/drivers/s390/cio/io_sch.h b/drivers/s390/cio/io_sch.h index 220f49145b2f..9a1b56b2df3e 100644 --- a/drivers/s390/cio/io_sch.h +++ b/drivers/s390/cio/io_sch.h @@ -131,6 +131,8 @@ struct ccw_device_private { not operable */ u8 path_gone_mask; /* mask of paths, that became unavailable */ u8 path_new_mask; /* mask of paths, that became available */ + u8 path_broken_mask; /* mask of paths, which were found to be + unusable */ struct { unsigned int fast:1; /* post with "channel end" */ unsigned int repall:1; /* report every interrupt status */ -- cgit v1.2.3