diff options
Diffstat (limited to 'sys/scsi/scsi_driver.c')
| -rw-r--r-- | sys/scsi/scsi_driver.c | 24 |
1 files changed, 23 insertions, 1 deletions
diff --git a/sys/scsi/scsi_driver.c b/sys/scsi/scsi_driver.c index 06c1ebf..32d9c7b 100644 --- a/sys/scsi/scsi_driver.c +++ b/sys/scsi/scsi_driver.c @@ -35,7 +35,7 @@ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * - * $Id: scsi_driver.c,v 1.22 1997/02/22 09:44:31 peter Exp $ + * $Id: scsi_driver.c,v 1.23 1997/03/23 06:33:47 bde Exp $ * */ @@ -232,3 +232,25 @@ scsi_strategy(struct buf *bp, struct scsi_device *device) } } } + +int scsi_device_lock(struct scsi_link *sc_link) +{ + int error; + while (sc_link->flags & SDEV_XLOCK) { + sc_link->flags |= SDEV_WANT; + error = tsleep(&sc_link->flags, PRIBIO | PCATCH, "sdevlk",0); + if (error) + return error; + } + sc_link->flags |= SDEV_XLOCK; + return 0; +} + +void scsi_device_unlock(struct scsi_link *sc_link) +{ + sc_link->flags &= ~SDEV_XLOCK; + if (sc_link->flags & SDEV_WANT) { + sc_link->flags &= ~SDEV_WANT; + wakeup(&sc_link->flags); + } +} |
