linux-kernel - Re: linux-next: Tree for September 7 (scsi/qla2x)

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Message-ID: <20090908182541.GB44157@plap4-2.local>
Date:	Tue, 8 Sep 2009 11:25:41 -0700
From:	Andrew Vasquez <andrew.vasquez@...gic.com>
To:	Randy Dunlap <randy.dunlap@...cle.com>
Cc:	Stephen Rothwell <sfr@...b.auug.org.au>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	"linux-next@...r.kernel.org" <linux-next@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Giridhar Malavali <giridhar.malavali@...gic.com>
Subject: Re: linux-next: Tree for September 7 (scsi/qla2x)

On Mon, 07 Sep 2009, Randy Dunlap wrote:

> On Mon, 7 Sep 2009 21:02:06 +1000 Stephen Rothwell wrote:
> 
> > Hi all,
> > 
> > Changes since 20090904:
> 
> 
> when CONFIG_MODULES=n:
> 
> drivers/scsi/qla2xxx/qla_os.c:2685: error: dereferencing pointer to incomplete type
> 
> in
> 	kobject_uevent_env(&(&vha->hw->pdev->driver->driver)->owner->mkobj.kobj,
> 	    KOBJ_CHANGE, envp);

Argg...  Some history here...  During several unwelcome
hardware/firmware events (ISP system error, mailbox command timeouts,
etc), the qla2xxx driver can store a 'firmware-dump' (essentially a
snapshot of the current state of the ISP firmware).  This snapshot is
then captured via a user-space tool querying a driver sysfs-node
hanging off of a scsi_host's device tree:

	/sys/class/scsi_host/host4/device/fw_dump

The dump is then used by our firmware engineering group to help triage
the issue.

This recent change:

	commit 10a71b40153a19279428053ad9743e15ef414148
	Author: Andrew Vasquez <andrew.vasquez@...gic.com>
	Date:   Tue Aug 25 11:36:15 2009 -0700

	    [SCSI] qla2xxx: Add firmware-dump kobject uevent notification.

	    Signed-off-by: Andrew Vasquez <andrew.vasquez@...gic.com>
	    Signed-off-by: Giridhar Malavali <giridhar.malavali@...gic.com>
	    Signed-off-by: James Bottomley <James.Bottomley@...e.de>

attempted to help 'automate' the task of retrieval by signaling udev
to automatically run the 'retrieval' script anytime the driver
captured the firmware-dump.  Here's a snippet of the udev rule:

	# qla2xxx driver
	KERNEL=="qla2xxx", SUBSYSTEM=="module", ACTION=="change", RUN+="qla2xxx_udev.sh"

Any suggestions here on an alternate driver-specific kobject an LLD
can/should use for something like this?  I looked previously at other
callers of kobject_uevent_env(), but didn't really see a simlar
usage-pattern of a driver wanting to signal events to userspace...

Thanks, AV
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