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Xiubo Li 862488105b nbd: fix possible sysfs duplicate warning 
1. nbd_put takes the mutex and drops nbd->ref to 0. It then does
idr_remove and drops the mutex.

2. nbd_genl_connect takes the mutex. idr_find/idr_for_each fails
to find an existing device, so it does nbd_dev_add.

3. just before the nbd_put could call nbd_dev_remove or not finished
totally, but if nbd_dev_add try to add_disk, we can hit:

debugfs: Directory 'nbd1' with parent 'block' already present!

This patch will make sure all the disk add/remove stuff are done
by holding the nbd_index_mutex lock.

Reported-by: Mike Christie <mchristi@redhat.com>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Xiubo Li <xiubli@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
 		2019-10-10 09:44:56 -06:00
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accessibility
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acpi Merge branch 'i2c/for-5.4' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2019-09-24 16:48:02 -07:00
amba ARM updates for 5.4-rc1: 2019-09-22 09:39:09 -07:00
android
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ata Revert "libata, freezer: avoid block device removal while system is frozen" 2019-10-06 09:11:37 -06:00
atm
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auxdisplay It's a somewhat calmer cycle for docs this time, as the churn of the mass 2019-09-17 16:22:26 -07:00
base mm,thp: stats for file backed THP 2019-09-24 15:54:11 -07:00
bcma bcma: make arrays pwr_info_offset and sprom_sizes static const, shrinks object size 2019-09-13 16:44:49 +03:00
block nbd: fix possible sysfs duplicate warning 2019-10-10 09:44:56 -06:00
bluetooth Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2019-09-15 14:17:27 +02:00
bus ARM: SoC: late updates for v5.4 2019-09-20 15:53:02 -07:00
cdrom
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char tpm: Wrap the buffer from the caller to tpm_buf in tpm_send() 2019-09-25 02:43:57 +03:00
clk Main MIPS changes for v5.4: 2019-09-22 09:30:30 -07:00
clocksource Main MIPS changes for v5.4: 2019-09-22 09:30:30 -07:00
connector
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counter
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cpufreq Power management updates for 5.4-rc1 2019-09-17 19:15:14 -07:00
cpuidle Power management updates for 5.4-rc1 2019-09-17 19:15:14 -07:00
crypto Merge branch 'akpm' (patches from Andrew) 2019-09-24 16:10:23 -07:00
dax
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dca
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devfreq
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dio
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dma Main MIPS changes for v5.4: 2019-09-22 09:30:30 -07:00
dma-buf
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edac ARM updates for 5.4-rc1: 2019-09-22 09:39:09 -07:00
eisa
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extcon chrome platform changes for v5.4 2019-09-19 14:14:28 -07:00
firewire
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firmware firmware: bcm47xx_nvram: _really_ correct size_t printf format 2019-09-22 11:31:15 -07:00
fpga Char/Misc driver patches for 5.4-rc1 2019-09-18 11:14:31 -07:00
fsi
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gnss
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gpio This is the bulk of pin control changes for the v5.4 kernel 2019-09-19 14:19:33 -07:00
gpu Merge branch 'i2c/for-5.4' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2019-09-24 16:48:02 -07:00
greybus
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hid - First round of vmbus hibernation support from Dexuan Cui. 2019-09-24 12:36:31 -07:00
hsi HSI changes for the 5.4 series 2019-09-22 12:02:21 -07:00
hv - First round of vmbus hibernation support from Dexuan Cui. 2019-09-24 12:36:31 -07:00
hwmon Main MIPS changes for v5.4: 2019-09-22 09:30:30 -07:00
hwspinlock
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hwtracing Char/Misc driver patches for 5.4-rc1 2019-09-18 11:14:31 -07:00
i2c Merge branch 'i2c/for-5.4' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2019-09-24 16:48:02 -07:00
i3c
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ide
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idle
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iio chrome platform changes for v5.4 2019-09-19 14:14:28 -07:00
infiniband Merge branch 'akpm' (patches from Andrew) 2019-09-24 16:10:23 -07:00
input chrome platform changes for v5.4 2019-09-19 14:14:28 -07:00
interconnect
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iommu Devicetree updates for v5.4: 2019-09-19 13:48:37 -07:00
ipack
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irqchip Main MIPS changes for v5.4: 2019-09-22 09:30:30 -07:00
isdn Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2019-09-15 14:17:27 +02:00
leds leds: lm3532: Fix optional led-max-microamp prop error handling 2019-09-12 20:45:52 +02:00
lightnvm lightnvm: print error when target is not found 2019-09-05 13:17:01 -06:00
macintosh
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mailbox mailbox: qcom-apcs: fix max_register value 2019-09-17 00:54:29 -05:00
mcb
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md for-5.4/post-2019-09-24 2019-09-24 16:31:50 -07:00
media Merge branch 'i2c/for-5.4' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2019-09-24 16:48:02 -07:00
memory
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memstick ms_block: fix spelling mistake "randomally" -> "randomly" 2019-09-11 16:11:01 +02:00
message
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mfd - New Drivers 2019-09-23 19:37:49 -07:00
misc Merge branch 'i2c/for-5.4' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2019-09-24 16:48:02 -07:00
mmc dma-mapping updates for 5.4: 2019-09-19 13:27:23 -07:00
mtd Main MIPS changes for v5.4: 2019-09-22 09:30:30 -07:00
mux
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net pci-v5.4-changes 2019-09-23 19:16:01 -07:00
nfc Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2019-09-15 14:17:27 +02:00
ntb
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nubus
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nvdimm libnvdimm for 5.4 2019-09-21 10:55:29 -07:00
nvme Merge branch 'nvme-5.4' of git://git.infradead.org/nvme into for-linus 2019-09-27 13:17:37 -06:00
nvmem Char/Misc driver patches for 5.4-rc1 2019-09-18 11:14:31 -07:00
of Devicetree updates for v5.4: 2019-09-19 13:48:37 -07:00
opp
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oprofile
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parisc dma-mapping updates for 5.4: 2019-09-19 13:27:23 -07:00
parport Char/Misc driver patches for 5.4-rc1 2019-09-18 11:14:31 -07:00
pci pci-v5.4-changes 2019-09-23 19:16:01 -07:00
pcmcia
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perf
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phy pci-v5.4-changes 2019-09-23 19:16:01 -07:00
pinctrl This is the bulk of pin control changes for the v5.4 kernel 2019-09-19 14:19:33 -07:00
platform platform-drivers-x86 for v5.4-2 2019-09-24 12:39:40 -07:00
pnp
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power power supply and reset changes for the v5.4 series 2019-09-22 12:04:59 -07:00
powercap Power management updates for 5.4-rc1 2019-09-17 19:15:14 -07:00
pps
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ps3
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ptp PTP: introduce new versions of IOCTLs 2019-09-13 15:57:02 +02:00
pwm chrome platform changes for v5.4 2019-09-19 14:14:28 -07:00
rapidio
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ras
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regulator LED updates for 5.4-rc1 2019-09-17 18:40:42 -07:00
remoteproc remoteproc updates for v5.4 2019-09-22 10:55:08 -07:00
reset
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rpmsg rpmsg: glink-smem: Name the edge based on parent remoteproc 2019-09-17 15:33:31 -07:00
rtc RTC for 5.4 2019-09-22 11:05:43 -07:00
s390 Revert "s390/dasd: Add discard support for ESE volumes" 2019-10-01 09:53:36 -06:00
sbus
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scsi for-5.4/post-2019-09-24 2019-09-24 16:31:50 -07:00
sfi
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sh
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siox
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slimbus
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soc ARM: SoC driver updates for v5.4 2019-09-16 15:52:38 -07:00
soundwire soundwire updates for v5.4-rc1 2019-09-22 10:52:23 -07:00
spi LED updates for 5.4-rc1 2019-09-17 18:40:42 -07:00
spmi
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ssb ssb: make array pwr_info_offset static const, makes object smaller 2019-09-13 17:23:18 +03:00
staging mm: introduce page_size() 2019-09-24 15:54:08 -07:00
target mm: introduce page_size() 2019-09-24 15:54:08 -07:00
tc
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tee
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thermal Merge branch 'pm-cpufreq' 2019-09-17 09:44:29 +02:00
thunderbolt
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tty TTY/Serial driver changes for 5.4-rc1 2019-09-18 10:50:47 -07:00
uio Char/Misc driver patches for 5.4-rc1 2019-09-18 11:14:31 -07:00
usb Merge branch 'work.mount3' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2019-09-24 12:33:34 -07:00
vfio mm: introduce page_shift() 2019-09-24 15:54:08 -07:00
vhost Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2019-09-15 14:17:27 +02:00
video - Core Frameworks 2019-09-23 19:33:56 -07:00
virt
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virtio virtio_ring: fix unmap of indirect descriptors 2019-09-09 10:43:15 -04:00
visorbus
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vlynq
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vme
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w1
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watchdog Merge branch 'i2c/for-5.4' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2019-09-24 16:48:02 -07:00
xen dma-mapping updates for 5.4: 2019-09-19 13:27:23 -07:00
zorro
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Kconfig Staging/IIO driver patches for 5.4-rc1 2019-09-18 11:05:34 -07:00
Makefile Staging/IIO driver patches for 5.4-rc1 2019-09-18 11:05:34 -07:00