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devmouse: fix openmode() handling

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openmode() can raise error with invalid mode passed, but we already
incremented the exclusive mouse refcount at that point! call openmode()
early to avoid this.
This commit is contained in:
cinap_lenrek 2013-08-27 23:26:30 +02:00
parent 244d2ee84b
commit 52a84514ac
1 changed files with 4 additions and 1 deletions
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5
sys/src/9/port/devmouse.c
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@ -170,6 +170,9 @@ mousestat(Chan *c, uchar *db, int n)
static Chan*
mouseopen(Chan *c, int omode)
{
int mode;
mode = openmode(omode);
switch((ulong)c->qid.path){
case Qdir:
if(omode != OREAD)
@ -193,7 +196,7 @@ mouseopen(Chan *c, int omode)
default:
incref(&mouse);
}
c->mode = openmode(omode);
c->mode = mode;
c->flag |= COPEN;
c->offset = 0;
return c;