From: Mark Lord <lkml@rtr.ca>
To: Linux Kernel <linux-kernel@vger.kernel.org>, linux-scsi@vger.kernel.org
Subject: BUG: SCSI SYNCHRONIZE_CACHE on driver unload
Date: Thu, 05 Aug 2004 19:02:18 -0400 [thread overview]
Message-ID: <4112BC7A.1040102@rtr.ca> (raw)
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.
Cheers
--
Mark Lord
(hdparm keeper & the original "Linux IDE Guy")
next reply other threads:[~2004-08-05 23:03 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-08-05 23:02 Mark Lord [this message]
2004-08-05 22:48 ` BUG: SCSI SYNCHRONIZE_CACHE on driver unload Randy.Dunlap
2004-08-05 23:13 ` Mark Lord
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