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sync with dev/isa/wd.c rev. 1.162: 

>date: 1997/07/18 00:26:22;  author: fvdl;  state: Exp;  lines: +10 -10
>Work around possible race condition with 2 drives on one controller
>in wd_get_parms. PR 3773, from Onno van der Linden (onno@simplex.nl)
S: ----------------------------------------------------------------------
This commit is contained in:
cgd 1997-07-19 06:39:22 +00:00
parent 2526fda257
commit 866bc1b267
1 changed files with 11 additions and 11 deletions
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22
sys/arch/alpha/isa/awd.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: awd.c,v 1.7 1997/07/17 03:16:39 jtk Exp $ */
/* $NetBSD: awd.c,v 1.8 1997/07/19 06:39:22 cgd Exp $ */
/*
* Copyright (c) 1994, 1995 Charles M. Hannum. All rights reserved.
@ -593,21 +593,21 @@ wdcstart(wdc)
panic("wdcstart: controller still active");
#endif
/*
* XXX
* This is a kluge. See comments in wd_get_parms().
*/
if ((wdc->sc_flags & WDCF_WANTED) != 0) {
wdc->sc_flags &= ~WDCF_WANTED;
wakeup(wdc);
return;
}
loop:
/* Is there a drive for the controller to do a transfer with? */
wd = wdc->sc_drives.tqh_first;
if (wd == NULL)
if (wd == NULL) {
/*
* XXX
* This is a kluge. See comments in wd_get_parms().
*/
if ((wdc->sc_flags & WDCF_WANTED) != 0) {
wdc->sc_flags &= ~WDCF_WANTED;
wakeup(wdc);
}
return;
}
/* Is there a transfer to this drive? If not, deactivate drive. */
bp = wd->sc_q.b_actf;