From 5f38433885245dce82aa53c20a6b2efbe81ae350 Mon Sep 17 00:00:00 2001 From: Michael Holzheu Date: Fri, 24 Mar 2006 03:15:28 -0800 Subject: [PATCH] s390: fix endless retry loop in tape driver If a tape device is assigned to another host, the interrupt for the assign operation comes back with deferred condition code 1. Under some conditions this can lead to an endless loop of retries. Check if the current request is still in IO in deferred condition code handling and prevent retries when the request has already been cancelled. Signed-off-by: Michael Holzheu Signed-off-by: Martin Schwidefsky Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/s390/char/tape_std.c | 15 +++++++-------- 1 file changed, 7 insertions(+), 8 deletions(-) (limited to 'drivers/s390/char/tape_std.c') diff --git a/drivers/s390/char/tape_std.c b/drivers/s390/char/tape_std.c index 2f9fe30989a7..99cf881f41db 100644 --- a/drivers/s390/char/tape_std.c +++ b/drivers/s390/char/tape_std.c @@ -37,20 +37,19 @@ tape_std_assign_timeout(unsigned long data) { struct tape_request * request; struct tape_device * device; + int rc; request = (struct tape_request *) data; if ((device = request->device) == NULL) BUG(); - spin_lock_irq(get_ccwdev_lock(device->cdev)); - if (request->callback != NULL) { - DBF_EVENT(3, "%08x: Assignment timeout. Device busy.\n", + DBF_EVENT(3, "%08x: Assignment timeout. Device busy.\n", device->cdev_id); - PRINT_ERR("%s: Assignment timeout. Device busy.\n", - device->cdev->dev.bus_id); - ccw_device_clear(device->cdev, (long) request); - } - spin_unlock_irq(get_ccwdev_lock(device->cdev)); + rc = tape_cancel_io(device, request); + if(rc) + PRINT_ERR("(%s): Assign timeout: Cancel failed with rc = %i\n", + device->cdev->dev.bus_id, rc); + } int -- cgit v1.2.2