How to stop scsi_eh_#

dbrazeau · 10-05-2011, 07:04 PM

I have a driver that adds a scsi host via scsi_add_host(). When my driver is calls removes the scsi host via scsi_remove_host I check the current running process, and the scsi_eh_# (the scsi error handler) is still running for the removed scsi host. When I try unloading the LSI SAS driver all of the associated scs_eh_# with it are stopped/killed. How do I get it to do this when my driver removes its scsi?

nini09 · 10-06-2011, 02:13 PM

SCSI host and SCSI error handler are in the different context. That means that SCSI host isn't relative to SCSI error handler. It isn't necessary when your driver is removed.

dbrazeau · 10-07-2011, 11:03 AM

Quote:

Originally Posted by nini09

SCSI host and SCSI error handler are in the different context. That means that SCSI host isn't relative to SCSI error handler. It isn't necessary when your driver is removed.

Then do you know what function call starts and stops the error handler process? My system is going to need to load and unload this SCSI driver a bunch of times, so I don't want to end up with hundreds of these error handlers running for SCSI hosts that don't exits any more.

nini09 · 10-07-2011, 02:38 PM

Normally SCSI error handler should be stoped when SCSI host is removed.

dbrazeau · 10-10-2011, 12:09 PM

Quote:

Originally Posted by nini09

Normally SCSI error handler should be stoped when SCSI host is removed.

Ummm... well for some reason it doesn't appear to be, even though the SCSI host is gone from '/sys/class/scsi_host/host[n]'.

nini09 · 10-10-2011, 02:52 PM

SCSI subsystem is very complex. It invokes multi layer. No only one function can take care of everything. What's your initialization model?

dbrazeau · 10-10-2011, 05:20 PM

Quote:

Originally Posted by nini09

SCSI subsystem is very complex. It invokes multi layer. No only one function can take care of everything. What's your initialization model?

I do a scsi_host_alloc(), then setup my SCSI host parameters, then call scsi_add_host(), and finally call scsi_scan_host().

nini09 · 10-11-2011, 02:19 PM

Based on SCSI document, when an HBA is being removed it could be as part of an orderly shutdown associated with the LLD module being unloaded.