[SCSI] qla2xxx: Add char device to increase driver use count
The driver should not be unloaded if any application is using it.
To disallow driver unload, driver use count must be incremented.
Application uses this char device as handle and increases driver
use count to avoid possible driver unload.
Signed-off-by: Giridhar Malavali <giridhar.malavali@qlogic.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
diff --git a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c
index f2102db..10c14af 100644
--- a/drivers/scsi/qla2xxx/qla_os.c
+++ b/drivers/scsi/qla2xxx/qla_os.c
@@ -24,6 +24,8 @@
*/
char qla2x00_version_str[40];
+static int apidev_major;
+
/*
* SRB allocation cache
*/
@@ -3763,6 +3765,10 @@
.err_handler = &qla2xxx_err_handler,
};
+static struct file_operations apidev_fops = {
+ .owner = THIS_MODULE,
+};
+
/**
* qla2x00_module_init - Module initialization.
**/
@@ -3791,6 +3797,13 @@
kmem_cache_destroy(srb_cachep);
return -ENODEV;
}
+
+ apidev_major = register_chrdev(0, QLA2XXX_APIDEV, &apidev_fops);
+ if (apidev_major < 0) {
+ printk(KERN_WARNING "qla2xxx: Unable to register char device "
+ "%s\n", QLA2XXX_APIDEV);
+ }
+
qla2xxx_transport_vport_template =
fc_attach_transport(&qla2xxx_transport_vport_functions);
if (!qla2xxx_transport_vport_template) {
@@ -3816,6 +3829,7 @@
static void __exit
qla2x00_module_exit(void)
{
+ unregister_chrdev(apidev_major, QLA2XXX_APIDEV);
pci_unregister_driver(&qla2xxx_pci_driver);
qla2x00_release_firmware();
kmem_cache_destroy(srb_cachep);