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authorLinus Torvalds <torvalds@linux-foundation.org>2016-03-25 09:02:13 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-03-25 09:02:13 -0700
commit1701f680407c6cc05121566cef5293d33881fe71 (patch)
treebf9e537a9a36ba066f6f1b25e6bde58c35516706 /drivers/char/ppdev.c
parent3b3b3bd97788e1f574c71f865d8465b00a6b8708 (diff)
downloadleg-kernel-1701f680407c6cc05121566cef5293d33881fe71.tar.gz
Revert "ppdev: use new parport device model"
This reverts commit e7223f18603374d235d8bb0398532323e5f318b9. It causes problems when a ppdev tries to register before the parport driver has been registered with the device model. That will trigger the BUG_ON(!drv->bus->p); at drivers/base/driver.c:153. The call chain is kernel_init -> kernel_init_freeable -> do_one_initcall -> ppdev_init -> __parport_register_driver -> driver_register *BOOM* Reported-by: kernel test robot <fengguang.wu@intel.com> Reported-by: Ross Zwisler <zwisler@gmail.com> Reported-by: Petr Mladek <pmladek@suse.com> Cc: Sudip Mukherjee <sudipm.mukherjee@gmail.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/char/ppdev.c')
-rw-r--r--drivers/char/ppdev.c25
1 files changed, 5 insertions, 20 deletions
diff --git a/drivers/char/ppdev.c b/drivers/char/ppdev.c
index d23368874710..f8a483c67b07 100644
--- a/drivers/char/ppdev.c
+++ b/drivers/char/ppdev.c
@@ -286,7 +286,7 @@ static int register_device(int minor, struct pp_struct *pp)
struct parport *port;
struct pardevice *pdev = NULL;
char *name;
- struct pardev_cb ppdev_cb;
+ int fl;
name = kasprintf(GFP_KERNEL, CHRDEV "%x", minor);
if (name == NULL)
@@ -299,11 +299,9 @@ static int register_device(int minor, struct pp_struct *pp)
return -ENXIO;
}
- memset(&ppdev_cb, 0, sizeof(ppdev_cb));
- ppdev_cb.irq_func = pp_irq;
- ppdev_cb.flags = (pp->flags & PP_EXCL) ? PARPORT_FLAG_EXCL : 0;
- ppdev_cb.private = pp;
- pdev = parport_register_dev_model(port, name, &ppdev_cb, minor);
+ fl = (pp->flags & PP_EXCL) ? PARPORT_FLAG_EXCL : 0;
+ pdev = parport_register_device(port, name, NULL,
+ NULL, pp_irq, fl, pp);
parport_put_port(port);
if (!pdev) {
@@ -801,23 +799,10 @@ static void pp_detach(struct parport *port)
device_destroy(ppdev_class, MKDEV(PP_MAJOR, port->number));
}
-static int pp_probe(struct pardevice *par_dev)
-{
- struct device_driver *drv = par_dev->dev.driver;
- int len = strlen(drv->name);
-
- if (strncmp(par_dev->name, drv->name, len))
- return -ENODEV;
-
- return 0;
-}
-
static struct parport_driver pp_driver = {
.name = CHRDEV,
- .probe = pp_probe,
- .match_port = pp_attach,
+ .attach = pp_attach,
.detach = pp_detach,
- .devmodel = true,
};
static int __init ppdev_init(void)