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Lang Dai 8fd0e2a6df uio: free uio id after uio file node is freed 
uio_register_device() do two things.
1) get an uio id from a global pool, e.g. the id is <A>
2) create file nodes like /sys/class/uio/uio<A>

uio_unregister_device() do two things.
1) free the uio id <A> and return it to the global pool
2) free the file node /sys/class/uio/uio<A>

There is a situation is that one worker is calling uio_unregister_device(),
and another worker is calling uio_register_device().
If the two workers are X and Y, they go as below sequence,
1) X free the uio id <AAA>
2) Y get an uio id <AAA>
3) Y create file node /sys/class/uio/uio<AAA>
4) X free the file note /sys/class/uio/uio<AAA>
Then it will failed at the 3rd step and cause the phenomenon we saw as it
is creating a duplicated file node.

Failure reports as follows:
sysfs: cannot create duplicate filename '/class/uio/uio10'
Call Trace:
   sysfs_do_create_link_sd.isra.2+0x9e/0xb0
   sysfs_create_link+0x25/0x40
   device_add+0x2c4/0x640
   __uio_register_device+0x1c5/0x576 [uio]
   adf_uio_init_bundle_dev+0x231/0x280 [intel_qat]
   adf_uio_register+0x1c0/0x340 [intel_qat]
   adf_dev_start+0x202/0x370 [intel_qat]
   adf_dev_start_async+0x40/0xa0 [intel_qat]
   process_one_work+0x14d/0x410
   worker_thread+0x4b/0x460
   kthread+0x105/0x140
 ? process_one_work+0x410/0x410
 ? kthread_bind+0x40/0x40
 ret_from_fork+0x1f/0x40
 Code: 85 c0 48 89 c3 74 12 b9 00 10 00 00 48 89 c2 31 f6 4c 89 ef
 e8 ec c4 ff ff 4c 89 e2 48 89 de 48 c7 c7 e8 b4 ee b4 e8 6a d4 d7
 ff <0f> 0b 48 89 df e8 20 fa f3 ff 5b 41 5c 41 5d 5d c3 66 0f 1f 84
---[ end trace a7531c1ed5269e84 ]---
 c6xxvf b002:00:00.0: Failed to register UIO devices
 c6xxvf b002:00:00.0: Failed to register UIO devices

Signed-off-by: Lang Dai <lang.dai@intel.com>

Link: https://lore.kernel.org/r/1600054002-17722-1-git-send-email-lang.dai@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2020-09-17 18:52:03 +02:00
..
accessibility Char/Misc driver fixes for 5.9-rc3 2020-08-26 10:50:50 -07:00
acpi Merge branch 'acpi-mm' 2020-08-28 21:17:56 +02:00
amba
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android binder: remove redundant assignment to pointer n 2020-09-16 17:30:37 +02:00
ata libata-5.9-2020-09-04 2020-09-04 13:19:19 -07:00
atm Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-09-03 18:50:48 -07:00
auxdisplay A trivial patch for auxdisplay: 2020-09-05 14:22:46 -07:00
base Driver core fixes for 5.9-rc5 2020-09-13 09:02:59 -07:00
bcma
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block rbd: require global CAP_SYS_ADMIN for mapping and unmapping 2020-09-07 13:14:30 +02:00
bluetooth
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bus treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
cdrom
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char char: virtio: Select VIRTIO from VIRTIO_CONSOLE. 2020-09-07 14:32:40 +02:00
clk More ACPI updates for 5.9-rc1 2020-08-15 08:18:22 -07:00
clocksource treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
connector
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counter counter: microchip-tcb-capture: check the correct variable 2020-08-22 11:38:42 +01:00
cpufreq cpufreq: intel_pstate: Fix intel_pstate_get_hwp_max() for turbo disabled 2020-09-01 21:15:00 +02:00
cpuidle cpuidle: Make CPUIDLE_FLAG_TLB_FLUSHED generic 2020-08-26 12:41:53 +02:00
crypto Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2020-08-30 15:53:44 -07:00
dax libnvdimm fix for v5.9-rc5 2020-09-12 12:43:58 -07:00
dca
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devfreq
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dio
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dma dmaengine fixes for v5.9-rc4 2020-09-04 12:12:39 -07:00
dma-buf dma-buf: fence-chain: Document missing dma_fence_chain_init() parameter in kerneldoc 2020-09-03 17:47:02 +05:30
edac A fix to properly clear ghes_edac driver state on driver remove so that 2020-08-30 10:47:23 -07:00
eisa
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extcon
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firewire treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
firmware Driver core fixes for 5.9-rc5 2020-09-13 09:02:59 -07:00
fpga fpga: dfl: create a dfl bus type to support DFL devices 2020-09-09 20:28:16 -07:00
fsi fsi: aspeed: Support CFAM reset GPIO 2020-09-10 12:26:43 +09:30
gnss
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gpio treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
gpu drm-misc-fixes for v5.9-rc5: 2020-09-11 09:49:23 +10:00
greybus drivers/greybus: Use kobj_to_dev() 2020-09-04 18:06:01 +02:00
hid Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid 2020-09-02 12:55:46 -07:00
hsi treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
hv hyperv-fixes for 5.9-rc3 2020-08-26 10:44:15 -07:00
hwmon hwmon fixes for v5.9-rc3 2020-08-29 12:37:00 -07:00
hwspinlock
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hwtracing coresight: etm4x: Fix number of resources check for ETM 4.3 and above 2020-09-17 18:46:05 +02:00
i2c i2c: algo: pca: Reapply i2c bus settings after reset 2020-09-09 10:22:40 +02:00
i3c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
ide treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
idle cpuidle: Make CPUIDLE_FLAG_TLB_FLUSHED generic 2020-08-26 12:41:53 +02:00
iio Staging / IIO driver fixes for 5.9-rc5 2020-09-13 09:15:20 -07:00
infiniband RDMA second 5.9-rc pull request 2020-09-11 10:02:36 -07:00
input treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
interconnect interconnect: qcom: Fix small BW votes being truncated to zero 2020-09-04 00:07:12 +03:00
iommu iommu/vt-d: Handle 36bit addressing for x86-32 2020-09-04 12:14:28 +02:00
ipack
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irqchip A set of fixes for interrupt chip drivers: 2020-08-30 11:56:54 -07:00
isdn treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
leds
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lightnvm treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
macintosh treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
mailbox iomap: constify ioreadX() iomem argument (as in generic implementation) 2020-08-14 19:56:57 -07:00
mcb
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md dm thin metadata: Fix use-after-free in dm_bm_set_read_only 2020-09-02 13:38:40 -04:00
media media fixes for v5.9-rc4 2020-09-03 08:22:16 -07:00
memory treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
memstick treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
message treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
mfd - Bug Fixes 2020-08-28 10:15:33 -07:00
misc eeprom: 93xx46: set type id as EEPROM 2020-09-17 18:47:22 +02:00
mmc mmc: sdio: Use mmc_pre_req() / mmc_post_req() 2020-09-07 08:57:44 +02:00
most
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mtd This pull request contains changes for JFFS2, UBI and UBIFS 2020-08-10 18:20:04 -07:00
mux treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
net Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-09-03 18:50:48 -07:00
nfc Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-09-03 18:50:48 -07:00
ntb treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
nubus
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nvdimm libnvdimm: KASAN: global-out-of-bounds Read in internal_create_group 2020-08-17 14:47:38 -06:00
nvme - Fix a regression in bdev partition locking (Christoph) 2020-09-11 11:55:28 -07:00
nvmem nvmem: core: fix missing of_node_put() in of_nvmem_device_get() 2020-09-17 18:48:23 +02:00
of of: address: Work around missing device_type property in pcie nodes 2020-08-19 16:30:57 -06:00
opp Merge branch 'opp/fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vireshk/pm 2020-09-01 19:44:20 +02:00
oprofile
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parisc Merge branch 'parisc-5.9-2' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux 2020-08-12 12:41:15 -07:00
parport treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
pci treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
pcmcia treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
perf treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
phy phy: fixes for 5.9 2020-09-04 12:41:55 +02:00
pinctrl
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platform treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
pnp
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power treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
powercap powercap/intel_rapl: add support for AlderLake 2020-09-10 19:17:29 +02:00
pps
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ps3 treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
ptp ptp: ptp_clockmatrix: use i2c_master_send for i2c write 2020-08-19 16:23:22 -07:00
pwm pwm: Changes for v5.9-rc1 2020-08-14 16:00:09 -07:00
rapidio rapidio: Replace 'select' DMAENGINES 'with depends on' 2020-09-05 19:52:54 +03:00
ras
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regulator regulator: Fixes for v5.9 2020-09-11 11:25:55 -07:00
remoteproc treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
reset treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
rpmsg treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
rtc treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
s390 treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
sbus
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scsi SCSI fixes on 20200908 2020-09-08 11:42:58 -07:00
sfi
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sh iomap: constify ioreadX() iomem argument (as in generic implementation) 2020-08-14 19:56:57 -07:00
siox
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slimbus
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soc treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
soundwire soundwire: fix double free of dangling pointer 2020-09-03 14:10:19 +05:30
spi spi: Fixes for v5.9 2020-09-11 11:35:55 -07:00
spmi
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ssb treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
staging Staging / IIO driver fixes for 5.9-rc5 2020-09-13 09:15:20 -07:00
target SCSI fixes on 20200908 2020-09-08 11:42:58 -07:00
tc
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tee
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thermal - Fix bogus thermal shutdowns for omap4430 where bogus values 2020-09-04 12:49:03 -07:00
thunderbolt thunderbolt: Fixes for v5.9-rc4 2020-09-01 09:48:28 +02:00
tty TTY/Serial fixes for 5.9-rc3 2020-08-26 10:58:20 -07:00
uio uio: free uio id after uio file node is freed 2020-09-17 18:52:03 +02:00
usb USB-serial fixes for 5.9-rc5 2020-09-08 17:50:58 +02:00
vdpa vdpa/mlx5: Avoid warnings about shifts on 32-bit platforms 2020-08-26 08:13:59 -04:00
vfio treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
vhost Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-09-03 18:50:48 -07:00
video video: fbdev: fix OOB read in vga_8planes_imageblit() 2020-09-04 17:27:10 +02:00
virt drivers/virt/fsl_hypervisor: Fix error handling path 2020-09-07 14:57:31 +02:00
virtio virtio: pci: constify ioreadX() iomem argument (as in generic implementation) 2020-08-14 19:56:57 -07:00
visorbus
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vlynq
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vme
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w1
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watchdog treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
xen xen: branch for v5.9-rc4 2020-09-06 09:59:27 -07:00
zorro
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Kconfig
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Makefile
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