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authorMichael Holzheu <holzheu@de.ibm.com>2006-03-24 03:15:28 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-24 07:33:18 -0800
commit5f38433885245dce82aa53c20a6b2efbe81ae350 (patch)
tree1731a5e3b9092f3ff060ac6aa652be8ec6dde890 /drivers/s390/char/tape_std.c
parent4cd190a736a97e302c038bd91357d636369d4c6b (diff)
[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 <holzheu@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/s390/char/tape_std.c')
-rw-r--r--drivers/s390/char/tape_std.c15
1 files changed, 7 insertions, 8 deletions
diff --git a/drivers/s390/char/tape_std.c b/drivers/s390/char/tape_std.c
index 2f9fe30989a..99cf881f41d 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