xfnw/plan9fox
1
0
Fork 0
Code Issues Pull requests Projects Releases Wiki Activity

pc, pc64: fix missed qunlock, use Ref with incref()/decref() instead of _xinc()/_xdec()

Browse source
This commit is contained in:
cinap_lenrek 2014-06-08 01:33:15 +02:00
parent ce38380b8f
commit 0a2b418535
1 changed files with 16 additions and 10 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

26
sys/src/9/pc/mtrr.c
View file

@ -186,7 +186,7 @@ mtrrop(Mtrrop **op)
int s;
ulong cr0, cr4;
vlong def;
static long bar1, bar2;
static Ref bar1, bar2;
s = splhi(); /* avoid race with mtrrclock */
@ -194,8 +194,8 @@ mtrrop(Mtrrop **op)
* wait for all CPUs to sync here, so that the MTRR setup gets
* done at roughly the same time on all processors.
*/
_xinc(&bar1);
while(bar1 < conf.nmach)
incref(&bar1);
while(bar1.ref < conf.nmach)
microdelay(10);
cr4 = getcr4();
@ -218,14 +218,14 @@ mtrrop(Mtrrop **op)
* wait for all CPUs to sync up again, so that we don't continue
* executing while the MTRRs are still being set up.
*/
_xinc(&bar2);
while(bar2 < conf.nmach)
incref(&bar2);
while(bar2.ref < conf.nmach)
microdelay(10);
decref(&bar1);
while(bar1.ref > 0)
microdelay(10);
decref(&bar2);
*op = nil;
_xdec(&bar1);
while(bar1 > 0)
microdelay(10);
_xdec(&bar2);
wakeup(&oprend);
splx(s);
}
@ -288,6 +288,10 @@ mtrr(uvlong base, uvlong size, char *tstr)
}
qlock(&mtrrlk);
if(waserror()){
qunlock(&mtrrlk);
nexterror();
}
slot = -1;
vcnt = cap & Capvcnt;
if(vcnt > Nmtrr)
@ -305,14 +309,16 @@ mtrr(uvlong base, uvlong size, char *tstr)
if(slot == -1)
error("no free mtrr slots");
while(postedop != nil)
while(!opavail(0))
sleep(&oprend, opavail, 0);
mtrrenc(&entry, base, size, type, 1);
op.reg = &entry;
op.slot = slot;
postedop = &op;
mtrrop(&postedop);
qunlock(&mtrrlk);
poperror();
return 0;
}