On 04/03/2015 11:11 PM, James Smart wrote: > Fix host reset escalation killing all IOs. > > SLI-3 adapters will use a new host template. The template differs > from SLI-4 adapters in that it does not have an eh_host_reset_handler. > > Lpfc has traditionally never had a host_reset. The host reset > handler was added when we ran into a stuck hardware condition on a > SLI-4 adapter. The host_reset will reset and reinit the pci function, > clearing the hardware condition. > > Unfortunately, the host reset handler uses attach/detach code paths, > which makes scsi_add_host() and scsi_remove_host() calls. Meaning, a > host_reset will completely remove the scsi_host from the system. As a > new call to scsi_add_host() is made, the shost# changes, which results > in completely new scsi_devices and device names. All the older scsi > devices on the old shost# are now orphaned and unrecoverable. > > We realize we need to re-implement the host_reset_handler so the scsi_host > stays registered across the host_reset, but that will be a rather > lengthy effort. In the short term, we had an immediate need to restore > the SLI-3 devices to their working behavior, with the easiest path being > to remove their host_reset handler. > > Signed-off-by: Dick Kennedy <dick.kennedy@xxxxxxxxxx> > Signed-off-by: James Smart <james.smart@xxxxxxxxxx> > --- Of course, this will disable the eh_deadline mechanism, which relies on the host_reset to be present. Of which you are perfectly aware :-) So, grudgingly: Reviewed-by: Hannes Reinecke <hare@xxxxxxx> Cheers, Hannes -- Dr. Hannes Reinecke zSeries & Storage hare@xxxxxxx +49 911 74053 688 SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg GF: J. Hawn, J. Guild, F. Imendörffer, HRB 16746 (AG Nürnberg) -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
