[PATCH] parport_pc: release IO region properly if unsupported ITE887xcard is found

From: Jiri Kosina
Date: Thu Oct 06 2011 - 11:39:00 EST

sio_ite_8872_probe() bails out if it detects no-parallel (1S, 2S) or unknown

It doesn't call release_region() on the previously allocated resource though.
This causes

(a) leak of the resource
(b) kernel oops when parport module is removed and /proc/ioports is read. This
is because the string that has been associated to the IO port region
is a static char array inside the already removed module.

Let's call release_region() properly before baling out.

Signed-off-by: Jiri Kosina <jkosina@xxxxxxx>
drivers/parport/parport_pc.c | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/drivers/parport/parport_pc.c b/drivers/parport/parport_pc.c
index d1cdb94..d0b597b 100644
--- a/drivers/parport/parport_pc.c
+++ b/drivers/parport/parport_pc.c
@@ -2595,14 +2595,17 @@ static int __devinit sio_ite_8872_probe(struct pci_dev *pdev, int autoirq,
case 0x6:
printk(KERN_INFO "parport_pc: ITE8873 found (1S)\n");
+ release_region(inta_addr[i], 32);
return 0;
case 0x8:
printk(KERN_INFO "parport_pc: ITE8874 found (2S)\n");
+ release_region(inta_addr[i], 32);
return 0;
printk(KERN_INFO "parport_pc: unknown ITE887x\n");
printk(KERN_INFO "parport_pc: please mail 'lspci -nvv' "
"output to Rich.Liu@xxxxxxxxxx\n");
+ release_region(inta_addr[i], 32);
return 0;

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