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Date: Thu, 5 Aug 2004 15:48:26 -0700
From: "Randy.Dunlap" <rddunlap@osdl.org>
To: Mark Lord <lkml@rtr.ca>
Cc: linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org
Subject: Re: BUG: SCSI SYNCHRONIZE_CACHE on driver unload
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On Thu, 05 Aug 2004 19:02:18 -0400 Mark Lord wrote:

| On module removal of a SCSI Low-Level Driver (LLD),
| the mid-layer tries to do a SYNCHRONIZE_CACHE
| command to each device on each host of that driver.
| 
| But the command is issued *after* setting SHOST_CANCEL,
| which means that scsi_dispatch_cmd() will *always*
| fail the command inline, without passing to the LLD.
| 
| This bug shows up only for hosts/drives which support
| a write-back caching scheme.  For the more common
| write-thru scheme, the SYNCHRONIZE_CACHE command is
| never issued, so the bug never manifests.

Like this, when I unmount a zip drive (?):

Synchronizing SCSI cache for disk sde: <4>FAILED
  status = 0, message = 00, host = 1, driver = 00

--
~Randy