FMC: fix locking in sample chardev driver

The fmc-chardev module was over-locking, by calling misc
register/unregister while holding its spinlock.  This reported a
"scheduling while atomic" error.

Since the misc driver already serializes operations internally, this
commit downgrades the fmc-chardev lock to just cover its own list.

Reported-by: Sasha Levin <sasha.levin@oracle.com>
Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Alessandro Rubini <rubini@gnudd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 4 insertions, 5 deletions

diff --git a/drivers/fmc/fmc-chardev.c b/drivers/fmc/fmc-chardev.c
index cc031db2d2a3..ace6ef24d15e 100644
--- a/drivers/fmc/fmc-chardev.c
+++ b/drivers/fmc/fmc-chardev.c
@@ -143,18 +143,17 @@ static int fc_probe(struct fmc_device *fmc)
         fc->misc.fops = &fc_fops;
         fc->misc.name = kstrdup(dev_name(&fmc->dev), GFP_KERNEL);
 
-        spin_lock(&fc_lock);
         ret = misc_register(&fc->misc);
         if (ret < 0)
-                goto err_unlock;
+                goto out;
+        spin_lock(&fc_lock);
         list_add(&fc->list, &fc_devices);
         spin_unlock(&fc_lock);
         dev_info(&fc->fmc->dev, "Created misc device \"%s\"\n",
                  fc->misc.name);
         return 0;
 
-err_unlock:
-        spin_unlock(&fc_lock);
+out:
         kfree(fc->misc.name);
         kfree(fc);
         return ret;
@@ -174,10 +173,10 @@ static int fc_remove(struct fmc_device *fmc)
 
         spin_lock(&fc_lock);
         list_del(&fc->list);
+        spin_unlock(&fc_lock);
         misc_deregister(&fc->misc);
         kfree(fc->misc.name);
         kfree(fc);
-        spin_unlock(&fc_lock);
 
         return 0;
 }