2006-09-07 kernel 2.6.16 bug fix patch 06 ("October 2005")

If you download any software from this web site please be aware of the Warranty Disclaimer and Limitation of Liabilities.

linux-2.6.16-s390-06-october2005.tar.gz / MD5 ... accumulated patch, recommended (2006-09-07)

linux-2.6.16-s390-06-october2005-patches.tar.gz / MD5 ... per-problem-patches, recommended (2006-09-07)

This patch contains the following linux kernel bug fixes:

Description:
cio: 5 minutes timeout after setting chpid offline.
Symptom:
After setting a path to a DASD offline at the SE, I/O hangs on that DASD for 5 minutes, then continues.
Problem:
I/O for which an interrupt will not be reported after the channel path has been disabled was not terminated by the common I/O layer, causing the dasd MIH to hit after 5 minutes.
Solution:
Be more aggressive in terminating I/O after setting a channel path offline. Also make sure to generate a fake irb if the device driver issues an I/O request after being notified of the killed I/O and clear residual information from the irb before trying to start the delayed verification.
Problem-ID:
25507
Description:
cio: Fix some path grouping and path verification related problems.
Symptom:
Hangs when paths become unavailable and available.
Problem:
Solution:
  1. Use NOP ccws for path verification (sans path grouping) when Set PGID is not supported.
  2. Check for PGIDs already set with SensePGID on all paths and try to find a common one. Moan if no common PGID can be found (and use NOP verification). If no PGIDs have been set, use the css global PGID (as before).
  3. Immediately before re-boot, issue RESET CHANNEL PATH (rcp) on all chpids.
Problem-ID:
25511
Description:
qeth: qethconf not adding ipa entries.
Symptom:
dmesg shows "qeth: Invalid IP address format!"
Problem:
incorrect / insufficient IP-address checking of qeth.
Solution:
Correct qeth IP-address checking (IPv4 and IPv6 addresses). Cover correct function for IP address attribute storing with "echo" and "echo -n", i.e. string termination with \n or \0.
Problem-ID:
24645
Description:
xpram: module parameter parsing.
Symptom:
Module parameters for xpram are not parsed or parsed in a wrong way.
Problem:
The xpram module uses the module_param_array directive with an int parameter which causes the kernel to automatically parse the passed numbers. This will cause errors if arguments are omitted or cause wrong results if arguments have size qualifiers.
Solution:
Use module_param_array with charp and parse the arguments later.
Problem-ID:
25393
Description:
zfcp: ERP "deadlock" when registering a SCSI device or remote port (partII).
Symptom:
I/O stall when SCSI commands fail during SCSI device or remote port registration.
Problem:
zfcp ERP waits for completion of SCSI device or remote port registration. The registration failed and an adapter re-open is triggered via scsi_eh. For the adapter re-open the ERP thread of zfcp is needed but this thread is blocked.
Solution:
Change adapter re-open for bus/host reset and scsi_er_timer to dismiss all FSF requests if ERP is already pending on the adapter. Thus the ERP thread will not block and can process further erp_actions.
Problem-ID:
23989
Description:
zfcp: failed paths remain unavailable.
Symptom:
If a path fails it cannot be recovered completely. Although zfcp will detect that the path is up again the corresponding SCSI device is offlined.
Problem:
SCSI device is offlined because zfcp does not use the dev_loss_tmo and fc_remote_port_delete functionality provided by the fc transport class.
Solution:
Make use of fc_remote_port_delete/dev_loss_tmo. This prevents the SCSI stack from offlining SCSI devices when a target port becomes unavailable.
Problem-ID:
23720

Everybody should apply this patch.

To create the complete linux kernel sources, the following patches need to be applied in sequence:

linux-2.6.16.tar.gz (from http://www.kernel.org/pub/linux/kernel/v2.6)
+ linux-2.6.16-s390-base-october2005.diff (IBM)
+ linux-2.6.16-s390-01-october2005.diff (IBM)
+ linux-2.6.16-s390-02-october2005.diff (IBM)
+ linux-2.6.16-s390-03-october2005.diff (IBM)
+ linux-2.6.16-s390-04-october2005.diff (IBM)
+ linux-2.6.16-s390-05-october2005.diff (IBM)
+ linux-2.6.16-s390-06-october2005.diff (IBM)

Contact the IBM team

If you want to contact the Linux on System z IBM team refer to the Contact the Linux on System z IBM team page.