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195512629c
linux/drivers/net
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Jacob Keller 195512629c i40e: use a mutex instead of spinlock in PTP user entry points 
We need a locking mechanism to protect the hardware SYSTIME register
which is split over 2 values, and has internal hardware latching. We
can't allow multiple accesses at the same time. However....

The spinlock_t is overkill here, especially use of spin_lock_irqsave,
since every PTP access will halt hardirqs. Notice that the only places
which need the SYSTIME value are user context and are capable of sleeping.
Thus, it is safe to use a mutex here instead of the spinlock.

Change-ID: I971761a89b58c6aad953590162e85a327fbba232
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
2016-10-31 14:26:40 -07:00
..
appletalk net: deprecate eth_change_mtu, remove usage 2016-10-13 09:36:57 -04:00
arcnet
bonding net: bonding: use new api ethtool_{get|set}_link_ksettings 2016-10-30 17:23:39 -04:00
caif
can
cris net: deprecate eth_change_mtu, remove usage 2016-10-13 09:36:57 -04:00
dsa Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-10-30 12:42:58 -04:00
ethernet i40e: use a mutex instead of spinlock in PTP user entry points 2016-10-31 14:26:40 -07:00
fddi net: use core MTU range checking in misc drivers 2016-10-20 14:51:10 -04:00
fjes net: use core MTU range checking in misc drivers 2016-10-20 14:51:10 -04:00
hamradio
hippi net: use core MTU range checking in misc drivers 2016-10-20 14:51:10 -04:00
hyperv Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-10-30 12:42:58 -04:00
ieee802154
ipvlan ipvlan: constify l3mdev_ops structure 2016-10-15 17:49:57 -04:00
irda
phy Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-10-30 12:42:58 -04:00
plip net: deprecate eth_change_mtu, remove usage 2016-10-13 09:36:57 -04:00
ppp
slip net: use core MTU range checking in misc drivers 2016-10-20 14:51:10 -04:00
team genetlink: mark families as __ro_after_init 2016-10-27 16:16:09 -04:00
usb Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-10-30 12:42:58 -04:00
vmxnet3 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-10-30 12:42:58 -04:00
wan Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-10-30 12:42:58 -04:00
wimax net: use core MTU range checking in wireless drivers 2016-10-20 14:51:08 -04:00
wireless Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-10-30 12:42:58 -04:00
xen-netback net: use core MTU range checking in virt drivers 2016-10-20 14:51:09 -04:00
dummy.c
eql.c
geneve.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-10-30 12:42:58 -04:00
gtp.c genetlink: mark families as __ro_after_init 2016-10-27 16:16:09 -04:00
ifb.c
Kconfig
LICENSE.SRC
loopback.c
macsec.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-10-30 12:42:58 -04:00
macvlan.c net: use core MTU range checking in core net infra 2016-10-20 14:51:09 -04:00
macvtap.c
Makefile
mdio.c
mii.c
netconsole.c
nlmon.c
ntb_netdev.c net: use core MTU range checking in core net infra 2016-10-20 14:51:09 -04:00
rionet.c net: use core MTU range checking in misc drivers 2016-10-20 14:51:10 -04:00
sb1000.c net: deprecate eth_change_mtu, remove usage 2016-10-13 09:36:57 -04:00
Space.c
sungem_phy.c
tun.c driver: tun: Use new macro SOCK_IOC_TYPE instead of literal number 0x89 2016-10-31 10:56:47 -04:00
veth.c net: use core MTU range checking in core net infra 2016-10-20 14:51:09 -04:00
virtio_net.c virtio-net: Update the mtu code to match virtio spec 2016-10-29 11:58:51 -04:00
vrf.c net: Require exact match for TCP socket lookups if dif is l3mdev 2016-10-17 10:17:05 -04:00
vxlan.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-10-30 12:42:58 -04:00
xen-netfront.c net: use core MTU range checking in virt drivers 2016-10-20 14:51:09 -04:00