Re: [PATCH] driver core: move uevent call to driver_register

From: Sebastian Ott
Date: Tue Jul 17 2012 - 04:41:15 EST


Hi,

On Mon, 16 Jul 2012, Greg Kroah-Hartman wrote:
> On Tue, Jul 17, 2012 at 09:35:02AM +0800, Ming Lei wrote:
> > On Tue, Jul 3, 2012 at 1:08 AM, Sebastian Ott <sebott@xxxxxxxxxxxxxxxxxx> wrote:
> >
> > > --- a/drivers/base/driver.c
> > > +++ b/drivers/base/driver.c
> > > @@ -187,6 +187,9 @@ int driver_register(struct device_driver
> > > ret = driver_add_groups(drv, drv->groups);
> > > if (ret)
> > > bus_remove_driver(drv);
> > > +
> > > + kobject_uevent(&drv->p->kobj, KOBJ_ADD);
> >
> > You should just send the uevent if 'ret' equals to zero., otherwise
> > OOPS may be triggered by kobject_uevent() after the 'drv' has been
> > removed.
>
> Ugh, just missed that.
>
> Sebastian, care to send a follow-on patch for this?

Here is the follow-on. (I've also replied with an updated patch..just in
case you want to take that one).

[PATCH] driver core: don't trigger uevent after failure

Do not send the uevent if driver_add_groups failed.

Found-by: Ming Lei <ming.lei@xxxxxxxxxxxxx>
Signed-off-by: Sebastian Ott <sebott@xxxxxxxxxxxxxxxxxx>
---
drivers/base/driver.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

--- a/drivers/base/driver.c
+++ b/drivers/base/driver.c
@@ -185,9 +185,10 @@ int driver_register(struct device_driver
if (ret)
return ret;
ret = driver_add_groups(drv, drv->groups);
- if (ret)
+ if (ret) {
bus_remove_driver(drv);
-
+ return ret;
+ }
kobject_uevent(&drv->p->kobj, KOBJ_ADD);

return ret;

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