On Wed, Nov 11, 2020 at 10:45:53AM -0500, Andrey Grodzovsky wrote: > > On 11/11/20 10:34 AM, Greg KH wrote: > > On Wed, Nov 11, 2020 at 10:13:13AM -0500, Andrey Grodzovsky wrote: > > > On 11/10/20 12:59 PM, Greg KH wrote: > > > > On Tue, Nov 10, 2020 at 12:54:21PM -0500, Andrey Grodzovsky wrote: > > > > > Hi, back to this after a long context switch for some higher priority stuff. > > > > > > > > > > So here I was able eventually to drop all this code and this change here https://nam11.safelinks.protection.outlook.com/?url=https:%2F%2Fcgit.freedesktop.org%2F~agrodzov%2Flinux%2Fcommit%2F%3Fh%3Damd-staging-drm-next-device-unplug%26id%3D61852c8a59b4dd89d637693552c73175b9f2ccd6&data=04%7C01%7CAndrey.Grodzovsky%40amd.com%7C9fbfecac94a340dfb68408d886571609%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637407055896651058%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=Ye8HJR1vidppcOBnlOgVu5GwKD2%2Bb5ztHbiI%2BubKKT0%3D&reserved=0 > > > > > was enough for me. Seems like while device_remove_file can handle the use > > > > > case where the file and the parent directory already gone, > > > > > sysfs_remove_group goes down in flames in that case > > > > > due to kobj->sd being unset on device removal. > > > > A driver shouldn't ever have to remove individual sysfs groups, the > > > > driver core/bus logic should do it for them automatically. > > > > > > > > And whenever a driver calls a sysfs_* call, that's a hint that something > > > > is not working properly. > > > > > > > > > Do you mean that while the driver creates the groups and files explicitly > > > from it's different subsystems it should not explicitly remove each > > > one of them because all of them should be removed at once (and > > > recursively) when the device is being removed ? > > Individual drivers should never add groups/files in sysfs, the driver > > core should do it properly for you if you have everything set up > > properly. And yes, the driver core will automatically remove them as > > well. > > > > Please use the default groups attribute for your bus/subsystem and this > > will happen automagically. > > Googling for default groups attributes i found this - https://www.linuxfoundation.org/blog/2013/06/how-to-create-a-sysfs-file-correctly/ Odd, mirror of the original article: http://kroah.com/log/blog/2013/06/26/how-to-create-a-sysfs-file-correctly/ > Would this be what you suggest for us ? Specifically for our case the struct > device's groups seems the right solution as different devices > might have slightly diffreent sysfs attributes. That's what the is_visable() callback in your attribute group is for, to tell the kernel if an individual sysfs attribute should be created or not. thanks, greg k-h _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
