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staging: vme_pio2: fix oops on module unloading 

This patch forbids loading vme_pio2 module without specifing "num_bus" parameter.
Otherwise on module unloading pio2_exit() calls vme_unregister_driver() for not
registered pio2_driver.

Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
Cc: Manohar Vanga <manohar.vanga@gmail.com>
Acked-by: Martyn Welch <martyn.welch@ge.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Konstantin Khlebnikov 2012-12-14 15:02:44 +04:00 committed by Greg Kroah-Hartman
parent 6102c48bd4
commit 9349f8af28
1 changed files with 2 additions and 12 deletions
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14
drivers/staging/vme/devices/vme_pio2_core.c
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@ -162,11 +162,9 @@ static struct vme_driver pio2_driver = {
static int __init pio2_init(void)
{
int retval = 0;
if (bus_num == 0) {
pr_err("No cards, skipping registration\n");
goto err_nocard;
return -ENODEV;
}
if (bus_num > PIO2_CARDS_MAX) {
@ -176,15 +174,7 @@ static int __init pio2_init(void)
}
/* Register the PIO2 driver */
retval = vme_register_driver(&pio2_driver, bus_num);
if (retval != 0)
goto err_reg;
return retval;
err_reg:
err_nocard:
return retval;
return vme_register_driver(&pio2_driver, bus_num);
}
static int pio2_match(struct vme_dev *vdev)