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pc, pc64: fix sdvirtio descriptor count when sending flush

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This commit is contained in:
mischief 2015-09-20 01:56:56 -07:00
parent f5174e6fdf
commit 30a9d59070
1 changed files with 14 additions and 8 deletions
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22
sys/src/9/pc/sdvirtio.c
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@ -326,7 +326,7 @@ vqio(Vqueue *q, int head)
static int
vioblkreq(Vdev *vd, int typ, void *a, long count, long secsize, uvlong lba)
{
int free, head;
int need, free, head;
Vqueue *q;
Vdesc *d;
@ -337,14 +337,18 @@ vioblkreq(Vdev *vd, int typ, void *a, long count, long secsize, uvlong lba)
u64int lba;
} req;
status = 0;
need = 2;
if(a != nil)
need = 3;
status = -1;
req.typ = typ;
req.prio = 0;
req.lba = lba;
q = vd->queue[0];
ilock(q);
while(q->nfree < 3){
while(q->nfree < need){
iunlock(q);
if(!waserror())
@ -361,10 +365,12 @@ vioblkreq(Vdev *vd, int typ, void *a, long count, long secsize, uvlong lba)
d->len = sizeof(req);
d->flags = Next;
d = &q->desc[free]; free = d->next;
d->addr = PADDR(a);
d->len = secsize*count;
d->flags = typ ? Next : (Write|Next);
if(a != nil){
d = &q->desc[free]; free = d->next;
d->addr = PADDR(a);
d->len = secsize*count;
d->flags = typ ? Next : (Write|Next);
}
d = &q->desc[free]; free = d->next;
d->addr = PADDR(&status);
@ -372,7 +378,7 @@ vioblkreq(Vdev *vd, int typ, void *a, long count, long secsize, uvlong lba)
d->flags = Write;
q->free = free;
q->nfree -= 3;
q->nfree -= need;
/* queue io, unlock and wait for completion */
vqio(q, head);