s390/cio: Make /dev/chsc a single-open device

In order to allow serialization of dynamic I/O with this patch
the /dev/chsc character device can only be accessed by one
single opener. Any subsequent open calls are rejected with EBUSY.

Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 19 insertions, 1 deletions

diff --git a/drivers/s390/cio/chsc_sch.c b/drivers/s390/cio/chsc_sch.c
index 190fc844d814..5fe9f8c4b4fb 100644
--- a/drivers/s390/cio/chsc_sch.c
+++ b/drivers/s390/cio/chsc_sch.c
@@ -847,9 +847,27 @@ static long chsc_ioctl(struct file *filp, unsigned int cmd,
         }
 }
 
+static atomic_t chsc_ready_for_use = ATOMIC_INIT(1);
+
+static int chsc_open(struct inode *inode, struct file *file)
+{
+        if (!atomic_dec_and_test(&chsc_ready_for_use)) {
+                atomic_inc(&chsc_ready_for_use);
+                return -EBUSY;
+        }
+        return nonseekable_open(inode, file);
+}
+
+static int chsc_release(struct inode *inode, struct file *filp)
+{
+        atomic_inc(&chsc_ready_for_use);
+        return 0;
+}
+
 static const struct file_operations chsc_fops = {
         .owner = THIS_MODULE,
-        .open = nonseekable_open,
+        .open = chsc_open,
+        .release = chsc_release,
         .unlocked_ioctl = chsc_ioctl,
         .compat_ioctl = chsc_ioctl,
         .llseek = no_llseek,