korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-11-16 16:54:20 +08:00
Code Issues Packages Projects Releases Wiki Activity
484d802d0f
linux/drivers
History
Florian Fainelli 484d802d0f net: systemport: Rewrite __bcm_sysport_tx_reclaim() 
There is no need for complex checking between the last consumed index
and current consumed index, a simple subtraction will do.

This also eliminates the possibility of a permanent transmit queue stall
under the following conditions:

- one CPU bursts ring->size worth of traffic (up to 256 buffers), to the
  point where we run out of free descriptors, so we stop the transmit
  queue at the end of bcm_sysport_xmit()

- because of our locking, we have the transmit process disable
  interrupts which means we can be blocking the TX reclamation process

- when TX reclamation finally runs, we will be computing the difference
  between ring->c_index (last consumed index by SW) and what the HW
  reports through its register

- this register is masked with (ring->size - 1) = 0xff, which will lead
  to stripping the upper bits of the index (register is 16-bits wide)

- we will be computing last_tx_cn as 0, which means there is no work to
  be done, and we never wake-up the transmit queue, leaving it
  permanently disabled

A practical example is e.g: ring->c_index aka last_c_index = 12, we
pushed 256 entries, HW consumer index = 268, we mask it with 0xff = 12,
so last_tx_cn == 0, nothing happens.

Fixes: 80105befdb ("net: systemport: add Broadcom SYSTEMPORT Ethernet MAC driver")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2018-03-16 11:16:55 -04:00
..
accessibility
acpi Merge branches 'acpi-ec', 'acpi-tables' and 'acpi-doc' 2018-02-15 12:02:42 +01:00
amba
android ANDROID: binder: synchronize_rcu() when using POLLFREE. 2018-02-16 11:16:38 +01:00
ata pci-v4.16-changes 2018-02-06 09:59:40 -08:00
atm atm: he: use 64-bit arithmetic instead of 32-bit 2018-02-08 15:05:16 -05:00
auxdisplay
base ACPI updates for v4.16-rc2 2018-02-15 14:50:32 -08:00
bcma Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-01-19 22:59:33 -05:00
block block: fix a typo 2018-03-01 08:41:27 -07:00
bluetooth Bluetooth: btusb: Add Dell OptiPlex 3060 to btusb_needs_reset_resume_table 2018-03-01 19:55:56 +01:00
bus bus: ti-sysc: Fix checking of no-reset-on-init quirk 2018-02-15 09:18:55 -08:00
cdrom
char tpm: fix potential buffer overruns caused by bit glitches on the bus 2018-02-26 15:43:46 -08:00
clk MIPS changes for 4.16 2018-02-07 11:22:44 -08:00
clocksource clocksource/drivers/arc_timer: Update some comments 2018-02-28 13:55:14 +01:00
connector
cpufreq Merge branch 'cpufreq-scpi' 2018-03-02 10:44:44 +01:00
cpuidle powerpc updates for 4.16 2018-02-02 10:01:04 -08:00
crypto s390: 2018-02-26 09:28:35 -08:00
dax dax: ->direct_access does not sleep anymore 2018-02-26 12:32:29 -08:00
dca
devfreq
dio
dma Merge branch 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm 2018-02-02 09:50:51 -08:00
dma-buf vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
edac EDAC, sb_edac: Fix out of bound writes during DIMM configuration on KNL 2018-02-23 12:05:37 +01:00
eisa EISA: Delete error message for a failed memory allocation in eisa_probe() 2018-01-23 09:04:10 +01:00
extcon extcon: int3496: process id-pin first so that we start with the right status 2018-02-14 06:37:33 +09:00
firewire vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
firmware 2nd set of arm64 updates for 4.16: 2018-02-08 10:44:25 -08:00
fmc
fpga
fsi
gpio gpio: Handle deferred probing in of_find_gpio() properly 2018-02-27 09:48:07 +01:00
gpu Merge branch 'drm-fixes-4.16' of git://people.freedesktop.org/~agd5f/linux into drm-fixes 2018-03-01 14:03:14 +10:00
hid usb: ldusb: add PIDs for new CASSY devices supported by this driver 2018-02-15 18:44:03 +01:00
hsi vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
hv vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
hwmon Fix bad temperature display on Ryzen/Threadripper 2018-02-15 14:31:28 -08:00
hwspinlock
hwtracing Char/Misc driver patches for 4.16-rc1 2018-02-01 10:31:17 -08:00
i2c i2c: octeon: Prevent error message on bus error 2018-03-02 11:11:15 +01:00
ide genhd: Rename get_disk() to get_disk_and_module() 2018-02-26 09:48:42 -07:00
idle
iio First round of IIO fixes for the 4.16 cycle. 2018-02-20 10:03:22 +01:00
infiniband RDMA/uverbs: Fix kernel panic while using XRC_TGT QP type 2018-02-21 13:52:19 -05:00
input vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
iommu treewide/trivial: Remove ';;$' typo noise 2018-02-22 10:59:33 +01:00
ipack
irqchip irqchip/bcm: Remove hashed address printing 2018-02-16 14:22:16 +00:00
isdn vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
leds vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
lightnvm
macintosh powerpc/macio: set a proper dma_coherent_mask 2018-02-13 08:58:53 -08:00
mailbox vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
mcb
md for-linus-20180302 2018-03-02 09:35:36 -08:00
media media: vb2: Makefile: place vb2-trace together with vb2-core 2018-02-26 11:39:04 -05:00
memory memory: brcmstb: dpfe: support new way of passing data from the DCPU 2018-02-23 10:56:59 -08:00
memstick
message scsi: mptfusion: Add bounds check in mptctl_hp_targetinfo() 2018-01-30 21:32:06 -05:00
mfd vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
misc powerpc fixes for 4.16 #4 2018-02-24 16:05:50 -08:00
mmc mmc: core: Avoid hanging to claim host for mmc via some nested calls 2018-02-27 15:12:37 +01:00
mtd mtd: nand: MTD_NAND_MARVELL should depend on HAS_DMA 2018-02-12 10:57:20 +01:00
mux Char/Misc driver patches for 4.16-rc1 2018-02-01 10:31:17 -08:00
net net: systemport: Rewrite __bcm_sysport_tx_reclaim() 2018-03-16 11:16:55 -04:00
nfc
ntb NTB: ntb_perf: fix cast to restricted __le32 2018-01-28 22:17:24 -05:00
nubus
nvdimm libnvdimm: re-enable deep flush for pmem devices via fsync() 2018-03-02 19:31:40 -08:00
nvme Merge branch 'for-jens' of git://git.infradead.org/nvme into for-linus 2018-02-28 12:18:58 -07:00
nvmem
of device property: Constify device_get_match_data() 2018-02-12 10:41:11 +01:00
opp opp: cpu: Replace GFP_ATOMIC with GFP_KERNEL in dev_pm_opp_init_cpufreq_table 2018-02-12 15:07:46 +05:30
oprofile
parisc
parport
pci pci-v4.16-fixes-2 2018-03-02 17:44:39 -08:00
pcmcia Merge branch 'pcmcia' of git://git.kernel.org/pub/scm/linux/kernel/git/brodo/pcmcia 2018-02-08 11:48:49 -08:00
perf arm_pmu: acpi: request IRQs up-front 2018-02-20 11:34:54 +00:00
phy USB/PHY updates for 4.16-rc1 2018-02-01 09:40:49 -08:00
pinctrl pinctrl: meson-axg: adjust uart_ao_b pin group naming 2018-02-12 10:47:36 +01:00
platform platform/x86: wmi: Fix misuse of vsprintf extension %pULL 2018-03-01 10:01:39 -08:00
pnp
power power supply and reset changes for the v4.16 series 2018-01-31 12:55:31 -08:00
powercap
pps vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
ps3
ptp vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
pwm
rapidio vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
ras mm/memory_failure: Remove unused trapno from memory_failure 2018-01-23 12:17:42 -06:00
regulator regulator: Fix suspend to idle 2018-01-30 12:25:59 +00:00
remoteproc remoteproc updates for v4.16 2018-02-05 10:07:40 -08:00
reset
rpmsg vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
rtc vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
s390 s390/qeth: fix IPA command submission race 2018-02-28 11:13:12 -05:00
sbus pci-v4.16-changes 2018-02-06 09:59:40 -08:00
scsi SCSI fixes on 20180222 2018-02-23 14:09:43 -08:00
sfi
sh cpufreq: Add and use cpufreq_for_each_{valid_,}entry_idx() 2018-02-08 10:21:39 +01:00
siox
slimbus
sn
soc soc/fsl/qbman: fix issue in qman_delete_cgr_safe() 2018-03-14 13:16:23 -04:00
soundwire soundwire: Fix a signedness bug 2018-01-22 16:45:26 +01:00
spi Merge remote-tracking branch 'spi/topic/xilinx' into spi-next 2018-01-26 17:57:34 +00:00
spmi
ssb Merge git://git.kernel.org/pub/scm/linux/kernel/git/kvalo/wireless-drivers.git 2018-02-01 10:37:39 +02:00
staging Staging/IIO fixes for 4.16-rc2 2018-02-22 12:05:43 -08:00
target Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending 2018-02-09 14:49:46 -08:00
tc
tee
thermal Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux 2018-02-06 15:04:58 -08:00
thunderbolt
tty vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
uio vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
usb USB fixes for 4.16-rc3 2018-02-22 12:13:01 -08:00
uwb
vfio vfio: disable filesystem-dax page pinning 2018-03-02 18:00:04 -08:00
vhost vhost_net: examine pointer types during un-producing 2018-03-09 12:02:59 -05:00
video Merge branch 'x86-pti-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2018-02-14 17:02:15 -08:00
virt vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
virtio virtio_pci: don't kfree device on register failure 2018-02-01 16:26:45 +02:00
visorbus
vlynq
vme
w1 Documentation updates for 4.16. New stuff includes refcount_t 2018-01-31 19:25:25 -08:00
watchdog watchdog: sp5100_tco.c: fix potential build failure 2018-02-19 17:44:05 +01:00
xen xen: fixes for v4.16-rc4 2018-03-02 10:19:57 -08:00
zorro
Kconfig Char/Misc driver patches for 4.16-rc1 2018-02-01 10:31:17 -08:00
Makefile pci-v4.16-changes 2018-02-06 09:59:40 -08:00