stallion, brd struct locking
Since assigning of stl_brds[brdnr] is racy, add locking to this critical
section.
Signed-off-by: Jiri Slaby <[email protected]>
---
commit 35d35cadc88b0f52cc4824fafc6a16f3c9301ef0
tree 4338edc3bf9671b1fafc18413cc08d3e631c7073
parent 47b4f5a42e198be7c2cf3606cf2681c04a42b197
author Jiri Slaby <[email protected]> Thu, 02 Nov 2006 19:31:31 +0100
committer Jiri Slaby <[email protected]> Thu, 02 Nov 2006 19:31:31 +0100
drivers/char/stallion.c | 18 +++++++++++++-----
1 files changed, 13 insertions(+), 5 deletions(-)
diff --git a/drivers/char/stallion.c b/drivers/char/stallion.c
index 048d2b0..072a226 100644
--- a/drivers/char/stallion.c
+++ b/drivers/char/stallion.c
@@ -136,6 +136,7 @@ static char stl_unwanted[SC26198_RXFIFO
/*****************************************************************************/
+static DEFINE_MUTEX(stl_brdslock);
static struct stlbrd *stl_brds[STL_MAXBRDS];
/*
@@ -2305,7 +2306,6 @@ static int __devinit stl_brdinit(struct
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,
@@ -2331,8 +2331,6 @@ err_free:
release_region(brdp->ioaddr1, brdp->iosize1);
if (brdp->iosize2 > 0)
release_region(brdp->ioaddr2, brdp->iosize2);
-
- stl_brds[brdp->brdnr] = NULL;
err:
return retval;
}
@@ -2385,12 +2383,17 @@ static int __devinit stl_pciprobe(struct
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;
@@ -2419,11 +2422,13 @@ static int __devinit stl_pciprobe(struct
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:
@@ -4737,10 +4742,13 @@ static int __init stallion_module_init(v
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;
-
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