[PATCH 00/15] Fix issue with KOBJ_ADD uevent versus disk attributes

Fam Zheng
2016-08-17T07:15:00Z

This is an attempt to fix the issue that some disks' sysfs attributes are not
ready at the time its KOBJ_ADD event is sent.

The symptom is during device hotplug, udev may fail to find certain attributes,
such as serial or wwn, of the disk. As a result the /dev/disk/by-id entries are
not created.

The cause is device_add_disk emits the uevent before returning, and the callers
have to create sysfs entries after that.

The fix here is to pass attr_groups from callers to device_add_disk, so it can
be added before KOBJ_ADD.

Also add basic error handling around device_add_disk code, (or add FIXME
comment where work is left).

Fam Zheng (15):
disk: Drop add_disk in favor of device_add_disk
genhd: Return error from register_disk()
genhd: Return error from blk_register_region
block: Return error from blk_integrity_add
genhd: Return error from disk_{add,alloc}_events
genhd: Add return code to device_add_disk
genhd: Add attribute group parameter to device_add_disk
nvme: Pass attribute group to device_add_disk
virtio-blk: Pass attribute group to device_add_disk
mtd: Pass attribute group to device_add_disk
zram: Pass attribute group to device_add_disk
mtip: Pass attribute group to device_add_disk
aoeblk: Pass attribute group to device_add_disk
axonram: Pass attribute group to device_add_disk
block: Add FIXME comment to handle device_add_disk error

arch/m68k/emu/nfblock.c | 3 +-
arch/powerpc/sysdev/axonram.c | 23 +++++---
arch/um/drivers/ubd_kern.c | 3 +-
arch/xtensa/platforms/iss/simdisk.c | 3 +-
block/blk-integrity.c | 12 ++--
block/genhd.c | 112 +++++++++++++++++++++++++-----------
drivers/block/DAC960.c | 3 +-
drivers/block/amiflop.c | 3 +-
drivers/block/aoe/aoeblk.c | 13 ++---
drivers/block/ataflop.c | 3 +-
drivers/block/brd.c | 6 +-
drivers/block/cciss.c | 3 +-
drivers/block/drbd/drbd_main.c | 3 +-
drivers/block/floppy.c | 5 +-
drivers/block/hd.c | 3 +-
drivers/block/loop.c | 3 +-
drivers/block/mg_disk.c | 3 +-
drivers/block/mtip32xx/mtip32xx.c | 39 +++----------
drivers/block/nbd.c | 3 +-
drivers/block/null_blk.c | 3 +-
drivers/block/osdblk.c | 3 +-
drivers/block/paride/pcd.c | 3 +-
drivers/block/paride/pd.c | 3 +-
drivers/block/paride/pf.c | 3 +-
drivers/block/pktcdvd.c | 3 +-
drivers/block/ps3disk.c | 3 +-
drivers/block/ps3vram.c | 3 +-
drivers/block/rbd.c | 3 +-
drivers/block/rsxx/dev.c | 3 +-
drivers/block/skd_main.c | 5 +-
drivers/block/sunvdc.c | 3 +-
drivers/block/swim.c | 3 +-
drivers/block/swim3.c | 3 +-
drivers/block/sx8.c | 3 +-
drivers/block/umem.c | 3 +-
drivers/block/virtio_blk.c | 38 ++++++++----
drivers/block/xen-blkfront.c | 3 +-
drivers/block/xsysace.c | 3 +-
drivers/block/z2ram.c | 3 +-
drivers/block/zram/zram_drv.c | 7 +--
drivers/cdrom/gdrom.c | 3 +-
drivers/ide/ide-cd.c | 3 +-
drivers/ide/ide-gd.c | 3 +-
drivers/lightnvm/gennvm.c | 3 +-
drivers/md/bcache/super.c | 6 +-
drivers/md/dm.c | 3 +-
drivers/md/md.c | 5 +-
drivers/memstick/core/ms_block.c | 3 +-
drivers/memstick/core/mspro_block.c | 3 +-
drivers/mmc/card/block.c | 3 +-
drivers/mtd/mtd_blkdevs.c | 9 +--
drivers/mtd/ubi/block.c | 3 +-
drivers/nvdimm/blk.c | 3 +-
drivers/nvdimm/btt.c | 3 +-
drivers/nvdimm/pmem.c | 3 +-
drivers/nvme/host/core.c | 7 +--
drivers/s390/block/dasd_genhd.c | 3 +-
drivers/s390/block/dcssblk.c | 3 +-
drivers/s390/block/scm_blk.c | 3 +-
drivers/s390/block/xpram.c | 3 +-
drivers/sbus/char/jsflash.c | 3 +-
drivers/scsi/sd.c | 3 +-
drivers/scsi/sr.c | 5 +-
drivers/scsi/st.c | 4 +-
fs/block_dev.c | 2 +-
include/linux/genhd.h | 21 +++----
66 files changed, 277 insertions(+), 186 deletions(-)

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2.7.4