4.17-stable review patch. If anyone has any objections, please let me know.
------------------
From: Christian Gromm <christian.gromm@xxxxxxxxxxxxx>
[ Upstream commit aba258b73101670c06b1dd700e500ed0a3fa0e8e ]
The function unregister_chrdev_region is called with a different counter
as the alloc_chrdev_region. To fix this, this patch introduces the
constant CHRDEV_REGION_SIZE that is used in both functions.
Signed-off-by: Christian Gromm <christian.gromm@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/staging/most/cdev/cdev.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
--- a/drivers/staging/most/cdev/cdev.c
+++ b/drivers/staging/most/cdev/cdev.c
@@ -18,6 +18,8 @@
#include <linux/idr.h>
#include "most/core.h"
+#define CHRDEV_REGION_SIZE 50
+
static struct cdev_component {
dev_t devno;
struct ida minor_id;
@@ -513,7 +515,7 @@ static int __init mod_init(void)
spin_lock_init(&ch_list_lock);
ida_init(&comp.minor_id);
- err = alloc_chrdev_region(&comp.devno, 0, 50, "cdev");
+ err = alloc_chrdev_region(&comp.devno, 0, CHRDEV_REGION_SIZE, "cdev");
if (err < 0)
goto dest_ida;
comp.major = MAJOR(comp.devno);
@@ -523,7 +525,7 @@ static int __init mod_init(void)
return 0;
free_cdev:
- unregister_chrdev_region(comp.devno, 1);
+ unregister_chrdev_region(comp.devno, CHRDEV_REGION_SIZE);
dest_ida:
ida_destroy(&comp.minor_id);
class_destroy(comp.class);
