[PATCH] Char: stallion, brd struct locking
Since assigning of stl_brds[brdnr] is racy, add locking to this critical
section.
Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/drivers/char/stallion.c b/drivers/char/stallion.c
index 7612464..87bda40b 100644
--- a/drivers/char/stallion.c
+++ b/drivers/char/stallion.c
@@ -136,6 +136,7 @@
/*****************************************************************************/
+static DEFINE_MUTEX(stl_brdslock);
static struct stlbrd *stl_brds[STL_MAXBRDS];
/*
@@ -2303,7 +2304,6 @@
goto err;
}
- stl_brds[brdp->brdnr] = brdp;
if ((brdp->state & BRD_FOUND) == 0) {
printk("STALLION: %s board not found, board=%d io=%x irq=%d\n",
stl_brdnames[brdp->brdtype], brdp->brdnr,
@@ -2329,8 +2329,6 @@
release_region(brdp->ioaddr1, brdp->iosize1);
if (brdp->iosize2 > 0)
release_region(brdp->ioaddr2, brdp->iosize2);
-
- stl_brds[brdp->brdnr] = NULL;
err:
return retval;
}
@@ -2383,12 +2381,17 @@
retval = -ENOMEM;
goto err;
}
+ mutex_lock(&stl_brdslock);
brdp->brdnr = stl_getbrdnr();
if (brdp->brdnr < 0) {
dev_err(&pdev->dev, "too many boards found, "
"maximum supported %d\n", STL_MAXBRDS);
+ mutex_unlock(&stl_brdslock);
goto err_fr;
}
+ stl_brds[brdp->brdnr] = brdp;
+ mutex_unlock(&stl_brdslock);
+
brdp->brdtype = brdtype;
brdp->state |= STL_PROBED;
@@ -2417,11 +2420,13 @@
brdp->irq = pdev->irq;
retval = stl_brdinit(brdp);
if (retval)
- goto err_fr;
+ goto err_null;
pci_set_drvdata(pdev, brdp);
return 0;
+err_null:
+ stl_brds[brdp->brdnr] = NULL;
err_fr:
kfree(brdp);
err:
@@ -4735,10 +4740,13 @@
brdp->irqtype = conf.irqtype;
if (stl_brdinit(brdp))
kfree(brdp);
- else
+ else {
+ stl_brds[brdp->brdnr] = brdp;
stl_nrbrds = i + 1;
+ }
}
+ /* this has to be _after_ isa finding because of locking */
retval = pci_register_driver(&stl_pcidriver);
if (retval && stl_nrbrds == 0)
goto err;