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authorStefan Weinhuber <wein@de.ibm.com>2009-12-07 14:51:51 +0300
committerMartin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com>2009-12-07 14:51:34 +0300
commiteb6e199bef288611157b8198c25d12b32bf058d0 (patch)
tree80737a2703a9f4d09cee2410342aeccb281413ae /drivers/s390/block/dasd_alias.c
parent626350b63ef2cd447023d3dc2a34eaa7ca01bfff (diff)
downloadlinux-eb6e199bef288611157b8198c25d12b32bf058d0.tar.xz
[S390] dasd: improve error recovery for internal I/O
Most of the error conditions reported by a FICON storage server indicate situations which can be recovered. Sometimes the host just needs to retry an I/O request, but sometimes the recovery is more complex and requires the device driver to wait, choose a different path, etc. The DASD device driver has a fully featured error recovery for normal block layer I/O, but not for internal I/O request which are for example used during the device bring up. This can lead to situations where the IPL of a system fails because DASD devices are not properly recognized. This patch will extend the internal I/O handling to use the existing error recovery procedures. Signed-off-by: Stefan Weinhuber <wein@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390/block/dasd_alias.c')
-rw-r--r--drivers/s390/block/dasd_alias.c15
1 files changed, 8 insertions, 7 deletions
diff --git a/drivers/s390/block/dasd_alias.c b/drivers/s390/block/dasd_alias.c
index 70a008c00522..cdc6c049c353 100644
--- a/drivers/s390/block/dasd_alias.c
+++ b/drivers/s390/block/dasd_alias.c
@@ -755,11 +755,11 @@ static void __stop_device_on_lcu(struct dasd_device *device,
{
/* If pos == device then device is already locked! */
if (pos == device) {
- pos->stopped |= DASD_STOPPED_SU;
+ dasd_device_set_stop_bits(pos, DASD_STOPPED_SU);
return;
}
spin_lock(get_ccwdev_lock(pos->cdev));
- pos->stopped |= DASD_STOPPED_SU;
+ dasd_device_set_stop_bits(pos, DASD_STOPPED_SU);
spin_unlock(get_ccwdev_lock(pos->cdev));
}
@@ -793,26 +793,26 @@ static void _unstop_all_devices_on_lcu(struct alias_lcu *lcu)
list_for_each_entry(device, &lcu->active_devices, alias_list) {
spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
- device->stopped &= ~DASD_STOPPED_SU;
+ dasd_device_remove_stop_bits(device, DASD_STOPPED_SU);
spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
}
list_for_each_entry(device, &lcu->inactive_devices, alias_list) {
spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
- device->stopped &= ~DASD_STOPPED_SU;
+ dasd_device_remove_stop_bits(device, DASD_STOPPED_SU);
spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
}
list_for_each_entry(pavgroup, &lcu->grouplist, group) {
list_for_each_entry(device, &pavgroup->baselist, alias_list) {
spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
- device->stopped &= ~DASD_STOPPED_SU;
+ dasd_device_remove_stop_bits(device, DASD_STOPPED_SU);
spin_unlock_irqrestore(get_ccwdev_lock(device->cdev),
flags);
}
list_for_each_entry(device, &pavgroup->aliaslist, alias_list) {
spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
- device->stopped &= ~DASD_STOPPED_SU;
+ dasd_device_remove_stop_bits(device, DASD_STOPPED_SU);
spin_unlock_irqrestore(get_ccwdev_lock(device->cdev),
flags);
}
@@ -836,7 +836,8 @@ static void summary_unit_check_handling_work(struct work_struct *work)
/* 2. reset summary unit check */
spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
- device->stopped &= ~(DASD_STOPPED_SU | DASD_STOPPED_PENDING);
+ dasd_device_remove_stop_bits(device,
+ (DASD_STOPPED_SU | DASD_STOPPED_PENDING));
spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
reset_summary_unit_check(lcu, device, suc_data->reason);