AuxXxilium/linux_dsm_epyc7002
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5012863b73
linux_dsm_epyc7002/drivers
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Jacob Keller 5012863b73 e1000e: fix race condition around skb_tstamp_tx() 
The e1000e driver and related hardware has a limitation on Tx PTP
packets which requires we limit to timestamping a single packet at once.
We do this by verifying that we never request a new Tx timestamp while
we still have a tx_hwtstamp_skb pointer.

Unfortunately the driver suffers from a race condition around this. The
tx_hwtstamp_skb pointer is not set to NULL until after skb_tstamp_tx()
is called. This function notifies the stack and applications of a new
timestamp. Even a well behaved application that only sends a new request
when the first one is finished might be woken up and possibly send
a packet before we can free the timestamp in the driver again. The
result is that we needlessly ignore some Tx timestamp requests in this
corner case.

Fix this by assigning the tx_hwtstamp_skb pointer prior to calling
skb_tstamp_tx() and use a temporary pointer to hold the timestamped skb
until that function finishes. This ensures that the application is not
woken up until the driver is ready to begin timestamping a new packet.

This ensures that well behaved applications do not accidentally race
with condition to skip Tx timestamps. Obviously an application which
sends multiple Tx timestamp requests at once will still only timestamp
one packet at a time. Unfortunately there is nothing we can do about
this.

Reported-by: David Mirabito <davidm@metamako.com>
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
2017-06-06 00:52:17 -07:00
..
accessibility
acpi Merge branches 'acpi-button' and 'acpi-tools' 2017-05-22 20:29:06 +02:00
amba
android
ata ARM: SoC driver updates 2017-05-09 10:01:15 -07:00
atm
auxdisplay
base Merge branches 'pm-sleep' and 'powercap' 2017-05-22 20:32:05 +02:00
bcma
block Merge branch 'for-linus' of git://git.kernel.dk/linux-block 2017-05-20 16:12:30 -07:00
bluetooth Bluetooth: btintel: Add MODULE_FIRMWARE entries for iBT 3.5 controllers 2017-05-23 19:54:55 +02:00
bus
cdrom scsi: introduce a result field in struct scsi_request 2017-04-20 12:16:10 -06:00
char drivers: char: mem: Check for address space wraparound with mmap() 2017-05-18 16:53:55 +02:00
clk Sort of on the quieter side this time, which is probably due more 2017-05-10 13:38:18 -07:00
clocksource Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-05-12 10:43:25 -07:00
connector
cpufreq Merge branches 'intel_pstate', 'pm-cpufreq' and 'pm-cpufreq-sched' 2017-05-22 20:28:22 +02:00
cpuidle Merge branches 'pm-domains', 'pm-cpuidle', 'pm-sleep' and 'powercap' 2017-05-09 23:21:46 +02:00
crypto virtio: fixes, cleanups, performance 2017-05-10 11:33:08 -07:00
dax dax: fix false CONFIG_BLOCK dependency 2017-05-13 16:18:21 -07:00
dca
devfreq
dio
dma dmaengine updates for 4.12-rc1 2017-05-09 15:40:28 -07:00
dma-buf dma-buf: Rename dma-ops to prevent conflict with kunmap_atomic macro 2017-04-20 13:47:46 +05:30
edac EDAC, amd64: Fix reporting of Chip Select sizes on Fam17h 2017-05-03 16:27:36 +02:00
eisa
extcon
firewire
firmware More, and hopefully final, fixes after refactor for EFI pstore backend. 2017-05-22 19:31:07 -07:00
fmc
fpga fpga fr br: update supported version numbers 2017-04-26 11:38:56 +02:00
fsi
gpio Annotation of module parameters that specify device settings 2017-05-10 19:13:03 -07:00
gpu Merge branch 'drm-fixes-4.12' of git://people.freedesktop.org/~agd5f/linux into drm-fixes 2017-05-26 11:51:55 +10:00
hid Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2017-05-02 19:09:35 -07:00
hsi HSI: ssi_protocol: double free in ssip_pn_xmit() 2017-04-21 17:58:45 +02:00
hv char/misc patches for 4.12-rc1 2017-05-04 19:15:35 -07:00
hwmon hwmon: (coretemp) Handle frozen hotplug state correctly 2017-05-14 07:49:32 -07:00
hwspinlock
hwtracing drivers/hwtracing/intel_th/msu.c: use set_memory.h header 2017-05-08 17:15:14 -07:00
i2c i2c: designware: Fix bogus sda_hold_time due to uninitialized vars 2017-05-22 19:22:19 -07:00
ide ide: don't call memcpy with the same source and destination 2017-05-08 17:36:39 -04:00
idle x86/intel_idle: add Gemini Lake support 2017-05-01 23:17:37 +02:00
iio Annotation of module parameters that specify device settings 2017-05-10 19:13:03 -07:00
infiniband IB/mlx5: Bump driver version 2017-05-14 14:24:19 +03:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2017-05-13 10:25:05 -07:00
iommu iommu/mediatek: Include linux/dma-mapping.h 2017-05-17 14:51:54 +02:00
ipack
irqchip Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-05-21 11:45:26 -07:00
isdn Annotation of module parameters that specify device settings 2017-05-10 19:13:03 -07:00
leds leds: pca955x: Correct I2C Functionality 2017-05-22 21:12:44 +02:00
lguest
lightnvm lightnvm: fix bad back free on error path 2017-05-04 07:53:04 -06:00
macintosh DeviceTree for 4.12: 2017-05-05 19:33:07 -07:00
mailbox mailbox: handle empty message in tx_tick 2017-04-27 16:20:04 +05:30
mcb
md Merge tag 'md/4.12-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/shli/md 2017-05-18 12:04:41 -07:00
media Annotation of module parameters that specify device settings 2017-05-10 19:13:03 -07:00
memory memory: omap-gpmc: Fix debug output for access width 2017-05-16 08:12:47 -07:00
memstick
message scsi: mpt: Move scsi_remove_host() out of mptscsih_remove_host() 2017-04-24 18:21:17 -04:00
mfd mfd: axp20x: Support AXP803 variant 2017-04-27 11:54:49 +01:00
misc misc: pci_endpoint_test: select CRC32 2017-05-16 23:05:40 +02:00
mmc This pull request contains fixes to make the WiFi work again for the ARM64 2017-05-26 09:05:35 -07:00
mtd This pull request contains updates for both UBI and UBIFS: 2017-05-13 10:23:12 -07:00
net e1000e: fix race condition around skb_tstamp_tx() 2017-06-06 00:52:17 -07:00
nfc
ntb
nubus nubus: Clean up whitespace 2017-04-20 09:54:24 +02:00
nvdimm Merge branch 'libnvdimm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm 2017-05-12 15:43:10 -07:00
nvme nvme: Quirk APST on Intel 600P/P3100 devices 2017-05-26 11:53:02 +03:00
nvmem ARM: SoC driver updates 2017-05-09 10:01:15 -07:00
of MMC host: 2017-05-24 08:21:56 -07:00
oprofile
parisc
parport Annotate hardware config module parameters in drivers/parport/ 2017-04-20 12:02:32 +01:00
pci PCI/PM: Add needs_resume flag to avoid suspend complete optimization 2017-05-23 14:18:17 -05:00
pcmcia Annotation of module parameters that specify device settings 2017-05-10 19:13:03 -07:00
perf
phy
pinctrl Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2017-05-02 19:09:35 -07:00
platform char/misc patches for 4.12-rc1 2017-05-04 19:15:35 -07:00
pnp
power power supply and reset changes for the v4.12 series (part 2) 2017-05-12 12:02:21 -07:00
powercap PowerCap: Fix an error code in powercap_register_zone() 2017-05-14 13:30:05 +02:00
pps
ps3
ptp Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-05-01 16:15:18 -07:00
pwm
rapidio char/misc patches for 4.12-rc1 2017-05-04 19:15:35 -07:00
ras
regulator Merge remote-tracking branch 'regulator/topic/vctrl' into regulator-next 2017-04-30 22:17:44 +09:00
remoteproc virtio: fixes, cleanups, performance 2017-05-10 11:33:08 -07:00
reset ARM: SoC driver updates 2017-05-09 10:01:15 -07:00
rpmsg virtio: fixes, cleanups, performance 2017-05-10 11:33:08 -07:00
rtc Merge branches 'pm-sleep' and 'powercap' 2017-05-22 20:32:05 +02:00
s390 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2017-05-16 09:24:44 -07:00
sbus
scsi Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2017-05-26 20:46:35 -04:00
sfi
sh
sn
soc ARM: SoC fixes (and a cross-arch dt-include fix) 2017-05-19 13:36:56 -07:00
spi Merge remote-tracking branches 'spi/topic/ti-qspi' and 'spi/topic/xlp' into spi-next 2017-04-26 15:58:22 +01:00
spmi
ssb
staging staging: fsl-dpaa2/eth: add ETHERNET dependency 2017-05-16 14:23:31 +02:00
target Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending 2017-05-12 11:44:13 -07:00
tc
tee Linux 4.12-rc1 2017-05-18 23:54:47 -07:00
thermal Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux 2017-05-12 11:58:45 -07:00
thunderbolt
tty Annotation of module parameters that specify device settings 2017-05-10 19:13:03 -07:00
uio uio: fix incorrect memory leak cleanup 2017-05-16 23:06:41 +02:00
usb USB-serial fixes for v4.12-rc2 2017-05-19 10:10:07 +02:00
uwb uwb: fix device quirk on big-endian hosts 2017-05-17 11:27:41 +02:00
vfio powerpc updates for 4.12 part 1. 2017-05-05 11:36:44 -07:00
vhost vhost_net: try batch dequing from skb array 2017-05-18 10:07:42 -04:00
video fbdev changes for v4.12: 2017-05-11 11:12:26 -07:00
virt drivers/virt/fsl_hypervisor.c: use get_user_pages_unlocked() 2017-05-08 17:15:10 -07:00
virtio virtio: allow extra context per descriptor 2017-05-02 23:41:43 +03:00
vlynq
vme
w1
watchdog watchdog: bcm281xx: Fix use of uninitialized spinlock. 2017-05-19 10:42:25 +02:00
xen Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2017-05-09 09:12:53 -07:00
zorro
Kconfig
Makefile Merge branch 'tee/initial-merge' into fixes 2017-05-10 21:03:31 +02:00