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authorBryan O'Sullivan <bos@pathscale.com>2006-04-24 14:22:57 -0700
committerRoland Dreier <rolandd@cisco.com>2006-05-01 12:14:11 -0700
commit755e4ca4a9885b79a14169ab5b615920eb38a32a (patch)
treedf85b5a5f16f25db7f6d106c69f4ddb10b9f1880 /drivers
parent254abfd33a214617deb916585b306faee834c97f (diff)
downloadop-kernel-dev-755e4ca4a9885b79a14169ab5b615920eb38a32a.zip
op-kernel-dev-755e4ca4a9885b79a14169ab5b615920eb38a32a.tar.gz
IB/ipath: fix race with exposing reset file
We were accidentally exposing the "reset" sysfs file more than once per device. Signed-off-by: Bryan O'Sullivan <bos@pathscale.com> Signed-off-by: Roland Dreier <rolandd@cisco.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/infiniband/hw/ipath/ipath_diag.c3
-rw-r--r--drivers/infiniband/hw/ipath/ipath_sysfs.c14
2 files changed, 15 insertions, 2 deletions
diff --git a/drivers/infiniband/hw/ipath/ipath_diag.c b/drivers/infiniband/hw/ipath/ipath_diag.c
index 7d3fb69..28ddceb 100644
--- a/drivers/infiniband/hw/ipath/ipath_diag.c
+++ b/drivers/infiniband/hw/ipath/ipath_diag.c
@@ -277,13 +277,14 @@ static int ipath_diag_open(struct inode *in, struct file *fp)
bail:
spin_unlock_irqrestore(&ipath_devs_lock, flags);
- mutex_unlock(&ipath_mutex);
/* Only expose a way to reset the device if we
make it into diag mode. */
if (ret == 0)
ipath_expose_reset(&dd->pcidev->dev);
+ mutex_unlock(&ipath_mutex);
+
return ret;
}
diff --git a/drivers/infiniband/hw/ipath/ipath_sysfs.c b/drivers/infiniband/hw/ipath/ipath_sysfs.c
index 32acd80..f323791 100644
--- a/drivers/infiniband/hw/ipath/ipath_sysfs.c
+++ b/drivers/infiniband/hw/ipath/ipath_sysfs.c
@@ -711,10 +711,22 @@ static struct attribute_group dev_attr_group = {
* enters diag mode. A device reset is quite likely to crash the
* machine entirely, so we don't want to normally make it
* available.
+ *
+ * Called with ipath_mutex held.
*/
int ipath_expose_reset(struct device *dev)
{
- return device_create_file(dev, &dev_attr_reset);
+ static int exposed;
+ int ret;
+
+ if (!exposed) {
+ ret = device_create_file(dev, &dev_attr_reset);
+ exposed = 1;
+ }
+ else
+ ret = 0;
+
+ return ret;
}
int ipath_driver_create_group(struct device_driver *drv)
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