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auxdisplay: ks0108: fix refcount

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commit bab383de3b84e584b0f09227151020b2a43dc34c upstream.

parport_find_base() will implicitly do parport_get_port() which
increases the refcount. Then parport_register_device() will again
increment the refcount. But while unloading the module we are only
doing parport_unregister_device() decrementing the refcount only once.
We add an parport_put_port() to neutralize the effect of
parport_get_port().

Signed-off-by: Sudip Mukherjee <sudip@vectorindia.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Zefan Li <lizefan@huawei.com>
This commit is contained in:
Sudip Mukherjee 2015-07-20 17:27:21 +05:30 committed by Zefan Li
parent ec2890a5fd
commit d4f8c54e0b
1 changed files with 1 additions and 0 deletions
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drivers/auxdisplay/ks0108.c
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@ -139,6 +139,7 @@ static int __init ks0108_init(void)
ks0108_pardevice = parport_register_device(ks0108_parport, KS0108_NAME, ks0108_pardevice = parport_register_device(ks0108_parport, KS0108_NAME,
NULL, NULL, NULL, PARPORT_DEV_EXCL, NULL); NULL, NULL, NULL, PARPORT_DEV_EXCL, NULL);
parport_put_port(ks0108_parport);
if (ks0108_pardevice == NULL) { if (ks0108_pardevice == NULL) {
printk(KERN_ERR KS0108_NAME ": ERROR: " printk(KERN_ERR KS0108_NAME ": ERROR: "
"parport didn't register new device\n"); "parport didn't register new device\n");