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From: Tor Egge <tegge@FreeBSD.ORG>
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	Wed, 25 Jun 1997 12:07:45 -0700 (PDT)
Date: Wed, 25 Jun 1997 12:07:45 -0700 (PDT)
Message-Id: <199706251907.MAA26570@freefall.freebsd.org>
To: cvs-committers@FreeBSD.ORG, cvs-all@FreeBSD.ORG, cvs-sys@FreeBSD.ORG
Subject: cvs commit: src/sys/scsi scsi_driver.c scsi_driver.h scsiconf.h
         sd.c
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tegge       1997/06/25 12:07:45 PDT

  Modified files:
    sys/scsi             scsi_driver.c scsi_driver.h scsiconf.h 
                         sd.c 
  Log:
  Introduce an advisory exclusive lock on the scsi link structure.
  Change sd_open, sd_close and sd_ioctl to use this lock to ensure
  serialization of some critical operations, thus avoiding some
  race conditions. Ideas picked from NetBSD (ccd and sd devices).
  This fixes one of the problems noted in PR kern/3688.
  Reviewed by:	"Justin T. Gibbs" <gibbs@plutotech.com>
  
  Revision  Changes    Path
  1.24      +23 -1     src/sys/scsi/scsi_driver.c
  1.12      +3 -1      src/sys/scsi/scsi_driver.h
  1.55      +3 -1      src/sys/scsi/scsiconf.h
  1.106     +18 -1     src/sys/scsi/sd.c