Messages in this thread | | | Date | Fri, 27 Sep 2019 20:18:56 +0200 | From | Greg Kroah-Hartman <> | Subject | Re: [PATCH] powerpc/vio: use simple dummy struct device as bus parent |
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On Fri, Sep 27, 2019 at 09:04:02AM -0400, Dan Streetman wrote: > The dummy vio_bus_device creates the /sys/devices/vio directory, which > contains real vio devices under it; since it represents itself as having > a bus = &vio_bus_type, its /sys/devices/vio/uevent does call the bus's > .uevent function, vio_hotplug(), and as that function won't find a real > device for the dummy vio_dev, it will return -ENODEV. > > One of the main users of the uevent node is udevadm, e.g. when it is called > with 'udevadm trigger --devices'. Up until recently, it would ignore any > errors returned when writing to devices' uevent file, but it was recently > changed to start returning error if it gets an error writing to any uevent > file: > https://github.com/systemd/systemd/commit/97afc0351a96e0daa83964df33937967c75c644f > > since the /sys/devices/vio/uevent file has always returned ENODEV from > any write to it, this now causes the udevadm trigger command to return > an error. This may be fixed in udevadm to ignore ENODEV errors, but the > vio driver should still be fixed. > > This patch changes the arch/powerpc/platform/pseries/vio.c 'dummy' > parent device into a real dummy device with no .bus, so its uevent > file will stop returning ENODEV and simply do nothing and return 0. > > Signed-off-by: Dan Streetman <ddstreet@canonical.com> > --- > arch/powerpc/platforms/pseries/vio.c | 11 ++++------- > 1 file changed, 4 insertions(+), 7 deletions(-) > > diff --git a/arch/powerpc/platforms/pseries/vio.c b/arch/powerpc/platforms/pseries/vio.c > index 79e2287991db..63bc16631680 100644 > --- a/arch/powerpc/platforms/pseries/vio.c > +++ b/arch/powerpc/platforms/pseries/vio.c > @@ -32,11 +32,8 @@ > #include <asm/page.h> > #include <asm/hvcall.h> > > -static struct vio_dev vio_bus_device = { /* fake "parent" device */ > - .name = "vio", > - .type = "", > - .dev.init_name = "vio", > - .dev.bus = &vio_bus_type, > +static struct device vio_bus = { > + .init_name = "vio",
Eeek, no! Why are you creating a static device that will then be reference counted? Not nice :(
What's wrong with a simple call to device_create() for your "fake" device you want to make here? That's what it is there for :)
thanks,
greg k-h
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