From 5d27a2bf6e14f5c7d1033ad1e993fcd0eba43e83 Mon Sep 17 00:00:00 2001 From: Stefan Haberland Date: Thu, 12 Apr 2018 13:38:22 +0200 Subject: [PATCH] s390/dasd: fix IO error for newly defined devices When a new CKD storage volume is defined at the storage server, Linux may be relying on outdated information about that volume, which leads to the following errors: 1. Command Reject Errors for minidisk on z/VM: dasd-eckd.b3193d: 0.0.XXXX: An error occurred in the DASD device driver, reason=09 dasd(eckd): I/O status report for device 0.0.XXXX: dasd(eckd): in req: 00000000XXXXXXXX CC:00 FC:04 AC:00 SC:17 DS:02 CS:00 RC:0 dasd(eckd): device 0.0.2046: Failing CCW: 00000000XXXXXXXX dasd(eckd): Sense(hex) 0- 7: 80 00 00 00 00 00 00 00 dasd(eckd): Sense(hex) 8-15: 00 00 00 00 00 00 00 00 dasd(eckd): Sense(hex) 16-23: 00 00 00 00 e1 00 0f 00 dasd(eckd): Sense(hex) 24-31: 00 00 40 e2 00 00 00 00 dasd(eckd): 24 Byte: 0 MSG 0, no MSGb to SYSOP 2. Equipment Check errors on LPAR or for dedicated devices on z/VM: dasd(eckd): I/O status report for device 0.0.XXXX: dasd(eckd): in req: 00000000XXXXXXXX CC:00 FC:04 AC:00 SC:17 DS:0E CS:40 fcxs:01 schxs:00 RC:0 dasd(eckd): device 0.0.9713: Failing TCW: 00000000XXXXXXXX dasd(eckd): Sense(hex) 0- 7: 10 00 00 00 13 58 4d 0f dasd(eckd): Sense(hex) 8-15: 67 00 00 00 00 00 00 04 dasd(eckd): Sense(hex) 16-23: e5 18 05 33 97 01 0f 0f dasd(eckd): Sense(hex) 24-31: 00 00 40 e2 00 04 58 0d dasd(eckd): 24 Byte: 0 MSG f, no MSGb to SYSOP Fix this problem by using the up-to-date information provided during online processing via the device specific SNEQ to detect the case of outdated LCU data. If there is a difference, perform a re-read of that data. Cc: stable@vger.kernel.org Reviewed-by: Jan Hoeppner Signed-off-by: Stefan Haberland Signed-off-by: Martin Schwidefsky --- drivers/s390/block/dasd_alias.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/drivers/s390/block/dasd_alias.c b/drivers/s390/block/dasd_alias.c index 62f5f04d8f61..5e963fe0e38d 100644 --- a/drivers/s390/block/dasd_alias.c +++ b/drivers/s390/block/dasd_alias.c @@ -592,13 +592,22 @@ static int _schedule_lcu_update(struct alias_lcu *lcu, int dasd_alias_add_device(struct dasd_device *device) { struct dasd_eckd_private *private = device->private; - struct alias_lcu *lcu; + __u8 uaddr = private->uid.real_unit_addr; + struct alias_lcu *lcu = private->lcu; unsigned long flags; int rc; - lcu = private->lcu; rc = 0; spin_lock_irqsave(&lcu->lock, flags); + /* + * Check if device and lcu type differ. If so, the uac data may be + * outdated and needs to be updated. + */ + if (private->uid.type != lcu->uac->unit[uaddr].ua_type) { + lcu->flags |= UPDATE_PENDING; + DBF_DEV_EVENT(DBF_WARNING, device, "%s", + "uid type mismatch - trigger rescan"); + } if (!(lcu->flags & UPDATE_PENDING)) { rc = _add_device_to_lcu(lcu, device, device); if (rc)