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[scsi] Eliminate polling while waiting for window to open

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Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown 2011-06-24 17:14:46 +01:00
parent 3915b660fd
commit 5c9c39e299
1 changed files with 13 additions and 6 deletions
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19
src/drivers/block/scsi.c
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@ -218,8 +218,10 @@ struct scsi_device {
/** SCSI device flags */
enum scsi_device_flags {
/** Unit is ready */
SCSIDEV_UNIT_READY = 0x0001,
/** TEST UNIT READY has been issued */
SCSIDEV_UNIT_TESTED = 0x0001,
/** TEST UNIT READY has completed successfully */
SCSIDEV_UNIT_READY = 0x0002,
};
/** A SCSI command */
@ -897,16 +899,20 @@ static struct interface_descriptor scsidev_ready_desc =
static void scsidev_step ( struct scsi_device *scsidev ) {
int rc;
/* Do nothing if we have already issued TEST UNIT READY */
if ( scsidev->flags & SCSIDEV_UNIT_TESTED )
return;
/* Wait until underlying SCSI device is ready */
if ( xfer_window ( &scsidev->scsi ) == 0 )
return;
/* Stop process */
process_del ( &scsidev->process );
DBGC ( scsidev, "SCSI %p waiting for unit to become ready\n",
scsidev );
/* Mark TEST UNIT READY as sent */
scsidev->flags |= SCSIDEV_UNIT_TESTED;
/* Issue TEST UNIT READY command */
if ( ( rc = scsidev_test_unit_ready ( scsidev, &scsidev->ready )) !=0){
scsidev_close ( scsidev, rc );
@ -916,6 +922,7 @@ static void scsidev_step ( struct scsi_device *scsidev ) {
/** SCSI device SCSI interface operations */
static struct interface_operation scsidev_scsi_op[] = {
INTF_OP ( xfer_window_changed, struct scsi_device *, scsidev_step ),
INTF_OP ( intf_close, struct scsi_device *, scsidev_close ),
};
@ -926,7 +933,7 @@ static struct interface_descriptor scsidev_scsi_desc =
/** SCSI device process descriptor */
static struct process_descriptor scsidev_process_desc =
PROC_DESC ( struct scsi_device, process, scsidev_step );
PROC_DESC_ONCE ( struct scsi_device, process, scsidev_step );
/**
* Open SCSI device