From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mike Christie Subject: does sym53c8xx_2 hardware support hotplug Date: Wed, 23 Apr 2008 15:10:06 -0500 Message-ID: <480F979E.5060302@cs.wisc.edu> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from sabe.cs.wisc.edu ([128.105.6.20]:57295 "EHLO sabe.cs.wisc.edu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752479AbYDWUKO (ORCPT ); Wed, 23 Apr 2008 16:10:14 -0400 Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: SCSI Mailing List , matthew@wil.cx Hi, Does the hardware sym53c8xx_2 works with support removing and adding devices? When using sym53c8xx_2 if we find storage, remove the device using the sysfs/proc interface, then physically remove the device, everything goes well. However, if we physically plug the disk back in and try to readd it through the sysfs/proc scanning interfaces, it looks like scsi_scan.c's inquiry will time out. This causes the sym error handler to run, which works great and we end up doing a BUS RESET (BDR failed so we got escalated), and after that the inqiury is retried and we find the device and it works fine. Is the inquiry timing out expected? Does the hardware even support hotplug? Or does it support it partially support it (support it with some help), and we are we supposed to be manually resetting the bus, with something like a sg_reset, after we have physically plug the disk back in? Thanks for any info, Mike