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A better fix to avoid race conditions between failed probes

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and peripheral removal.
Obtained from:gibbs@freebsd.org
This commit is contained in:
Matt Jacob 1999-01-07 20:19:09 +00:00
parent 0997d762cf
commit f403e6edea
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=42377
1 changed files with 15 additions and 6 deletions
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21
sys/cam/scsi/scsi_da.c
View file

@ -25,7 +25,7 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: scsi_da.c,v 1.17 1999/01/03 22:57:54 mjacob Exp $
* $Id: scsi_da.c,v 1.18 1999/01/05 20:43:41 mjacob Exp $
*/
#include "opt_hw_wdog.h"
@ -1376,8 +1376,7 @@ dadone(struct cam_periph *periph, union ccb *done_ccb)
printf("got CAM status %#x\n",
done_ccb->ccb_h.status);
}
xpt_release_ccb(done_ccb);
done_ccb = NULL;
xpt_print_path(periph->path);
printf("fatal error, failed"
" to attach to device\n");
@ -1394,8 +1393,17 @@ dadone(struct cam_periph *periph, union ccb *done_ccb)
if (announce_buf[0] != '\0')
xpt_announce_periph(periph, announce_buf);
softc->state = DA_STATE_NORMAL;
/*
* Since our peripheral may be invalidated by an error
* above or an external event, we must release our CCB
* before releasing the probe lock on the peripheral.
* The peripheral will only go away once the last lock
* is removed, and we need it around for the CCB release
* operation.
*/
xpt_release_ccb(done_ccb);
cam_periph_unlock(periph);
break;
return;
}
case DA_CCB_WAITING:
{
@ -1406,9 +1414,10 @@ dadone(struct cam_periph *periph, union ccb *done_ccb)
case DA_CCB_DUMP:
/* No-op. We're polling */
return;
default:
break;
}
if (done_ccb)
xpt_release_ccb(done_ccb);
xpt_release_ccb(done_ccb);
}
static int