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[SCSI] qla2xxx: Add char device to increase driver use count

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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>
This commit is contained in:
Harish Zunjarrao 2010-05-04 15:01:24 -07:00 committed by James Bottomley
parent 3e46f03132
commit 6a03b4cd78
2 changed files with 16 additions and 1 deletions
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3
drivers/scsi/qla2xxx/qla_def.h
View File

@ -35,7 +35,8 @@
#include "qla_bsg.h"
#include "qla_nx.h"
#define QLA2XXX_DRIVER_NAME "qla2xxx"
#define QLA2XXX_DRIVER_NAME "qla2xxx"
#define QLA2XXX_APIDEV "ql2xapidev"
/*
* We have MAILBOX_REGISTER_COUNT sized arrays in a few places,

14
drivers/scsi/qla2xxx/qla_os.c
View File

@ -24,6 +24,8 @@
*/
char qla2x00_version_str[40];
static int apidev_major;
/*
* SRB allocation cache
*/
@ -3763,6 +3765,10 @@ static struct pci_driver qla2xxx_pci_driver = {
.err_handler = &qla2xxx_err_handler,
};
static struct file_operations apidev_fops = {
.owner = THIS_MODULE,
};
/**
* qla2x00_module_init - Module initialization.
**/
@ -3791,6 +3797,13 @@ qla2x00_module_init(void)
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 @@ qla2x00_module_init(void)
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);