[PATCH] Fix handling of failure to create debugfs directory

[Pavel Roskin <proski@gnu.org>]

This can happen if CONFIG_BCM43XX_MAC80211_DEBUG is enabled, but
CONFIG_DEBUG_FS is not.

Signed-off-by: Pavel Roskin <proski@gnu.org>
---

 .../wireless/bcm43xx-mac80211/bcm43xx_debugfs.c    |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/bcm43xx-mac80211/bcm43xx_debugfs.c b/drivers/net/wireless/bcm43xx-mac80211/bcm43xx_debugfs.c
index 9ca4625..aded2b3 100644
--- a/drivers/net/wireless/bcm43xx-mac80211/bcm43xx_debugfs.c
+++ b/drivers/net/wireless/bcm43xx-mac80211/bcm43xx_debugfs.c
@@ -408,7 +408,7 @@ static struct file_operations restart_fops = {
 
 int bcm43xx_debug(struct bcm43xx_wldev *dev, enum bcm43xx_dyndbg feature)
 {
-	return !!(dev->dfsentry->dyn_debug[feature]);
+	return !!(dev->dfsentry && dev->dfsentry->dyn_debug[feature]);
 }
 
 static void bcm43xx_remove_dynamic_debug(struct bcm43xx_wldev *dev)
@@ -472,7 +472,9 @@ void bcm43xx_debugfs_add_device(struct bcm43xx_wldev *dev)
 	snprintf(devdir, sizeof(devdir), "%s", wiphy_name(dev->wl->hw->wiphy));
 	e->subdir = debugfs_create_dir(devdir, fs.root);
 	if (!e->subdir || IS_ERR(e->subdir)) {
-		e->subdir = NULL;
+		bcmerr(dev->wl, "debugfs: cannot create %s directory\n",
+		       devdir);
+		dev->dfsentry = NULL;
 		kfree(log->log);
 		kfree(e);
 		return;
@@ -525,6 +527,8 @@ void bcm43xx_debugfs_log_txstat(struct bcm43xx_wldev *dev,
 	struct bcm43xx_txstatus *cur;
 	int i;
 
+	if (!e)
+		return;
 	log = &e->txstatlog;
 	assert(irqs_disabled());
 	spin_lock(&log->lock);