Steffen Maier 3638ccda10 scsi: zfcp: fix reaction on bit error threshold notification ... commit 2190168aae upstream. On excessive bit errors for the FCP channel ingress fibre path, the channel notifies us. Previously, we only emitted a kernel message and a trace record. Since performance can become suboptimal with I/O timeouts due to bit errors, we now stop using an FCP device by default on channel notification so multipath on top can timely failover to other paths. A new module parameter zfcp.ber_stop can be used to get zfcp old behavior. User explanation of new kernel message: * Description: * The FCP channel reported that its bit error threshold has been exceeded. * These errors might result from a problem with the physical components * of the local fibre link into the FCP channel. * The problem might be damage or malfunction of the cable or * cable connection between the FCP channel and * the adjacent fabric switch port or the point-to-point peer. * Find details about the errors in the HBA trace for the FCP device. * The zfcp device driver closed down the FCP device * to limit the performance impact from possible I/O command timeouts. * User action: * Check for problems on the local fibre link, ensure that fibre optics are * clean and functional, and all cables are properly plugged. * After the repair action, you can manually recover the FCP device by * writing "0" into its "failed" sysfs attribute. * If recovery through sysfs is not possible, set the CHPID of the device * offline and back online on the service element. Fixes: 1da177e4c3 ("Linux-2.6.12-rc2") Cc: <stable@vger.kernel.org> #2.6.30+ Link: https://lore.kernel.org/r/20191001104949.42810-1-maier@linux.ibm.com Reviewed-by: Jens Remus <jremus@linux.ibm.com> Reviewed-by: Benjamin Block <bblock@linux.ibm.com> Signed-off-by: Steffen Maier <maier@linux.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2019-10-29 09:19:48 +01:00
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block	s390/dasd: fix endless loop after read unit address configuration	2019-08-06 19:06:55 +02:00
char	s390/3270: fix lockdep false positive on view->lock	2019-05-16 19:41:20 +02:00
cio	s390/cio: avoid calling strlen on null pointer	2019-10-11 18:21:08 +02:00
crypto	s390/zcrypt: reinit ap queue state machine during device probe	2019-09-16 08:21:57 +02:00
net	s390/qeth: fix VLAN attribute in bridge_hostnotify udev event	2019-06-25 11:35:59 +08:00
scsi	scsi: zfcp: fix reaction on bit error threshold notification	2019-10-29 09:19:48 +01:00
virtio	virtio/s390: fix race on airq_areas[]	2019-09-16 08:22:23 +02:00
Makefile	kbuild: rename built-in.o to built-in.a	2018-03-26 02:01:19 +09:00