gpu: vga_switcheroo, fix lock imbalance

Stanse found that one error path in vga_switcheroo_debugfs_write omits to
unlock vgasr_mutex.  Fix that.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/gpu/vga/vga_switcheroo.c b/drivers/gpu/vga/vga_switcheroo.c
index d6d1149..c8768f3 100644 (file)
--- a/drivers/gpu/vga/vga_switcheroo.c
+++ b/drivers/gpu/vga/vga_switcheroo.c
@@ -276,8 +276,10 @@ vga_switcheroo_debugfs_write(struct file *filp, const char __user *ubuf,
 
        mutex_lock(&vgasr_mutex);
 
-       if (!vgasr_priv.active)
-               return -EINVAL;
+       if (!vgasr_priv.active) {
+               cnt = -EINVAL;
+               goto out;
+       }
 
        /* pwr off the device not in use */
        if (strncmp(usercmd, "OFF", 3) == 0) {