[8828] in linux-scsi channel archive
Re: aic7xxx.c lock question
daemon@ATHENA.MIT.EDU (Kurt Garloff)
Wed May 17 07:04:29 2000
Date: Wed, 17 May 2000 12:51:34 +0200
From: Kurt Garloff <garloff@suse.de>
To: "WANG,YIDING (A-SanJose,ex1)" <yiding_wang@agilent.com>
Cc: "'linux_scsi'" <linux-scsi@vger.rutgers.edu>
Message-ID: <20000517125134.E860@garloff.tue.nl>
Mail-Followup-To: "WANG,YIDING (A-SanJose,ex1)" <yiding_wang@agilent.com>,
"'linux_scsi'" <linux-scsi@vger.rutgers.edu>
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In-Reply-To: <D53173D574D6D211945500A0C9E95BEBEE17D6@xsj02.sj.hp.com>; from yiding_wang@agilent.com on Fri, May 12, 2000 at 02:54:57PM -0400
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On Fri, May 12, 2000 at 02:54:57PM -0400, WANG,YIDING (A-SanJose,ex1) wrote:
> I hope someone can help me on the follwing issue:
>
> In aic7xxx.c code (also qla1280.h), driver locking is being used as needed
> for critical section protection. It is defined as DRIVER_LOCK and
> DRIVER_UNLOCK pair. However, the lock is only being used for LInux 2.1.95
> below. Questions:
>
> 1, Why the driver does not do locking for Linux 2.1.95 beyond (except
> spinlock in ISR)?
> 2, Does Linux version beyond 2.1.95 will do the locking automatically by
> just including two header files (spinlock.h, smp.h)?
> 3, If like most linux scsi drivers which not handling lock (except ISR) is
> accepted, does that mean either mutex lock is altomatically handled by Linux
> 2.1.95 and beyond, or simply include "smp.h" and :spinlock.h" will be
> enough?
Because since 2.1.95, the global spinlock io_request_lock is used to lock
the SCSI subsystem. All the locking is done by the mid-layer, before the low
level driver is even called.
Exception: IRQ, which is directly routed to the driver's IRQ handler.
Regards,
--
Kurt Garloff <garloff@suse.de> Eindhoven, NL
GPG key: See mail header, key servers Linux kernel development
SuSE GmbH, Nuernberg, FRG SCSI, Security
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