Brian Norris 25733c4e67 ath10k: pci: use mutex for diagnostic window CE polling ... The DIAG copy engine is only used via polling, but it holds a spinlock with softirqs disabled. Each iteration of our read/write loops can theoretically take 20ms (two 10ms timeout loops), and this loop can be run an unbounded number of times while holding the spinlock -- dependent on the request size given by the caller. As of commit 39501ea641 ("ath10k: download firmware via diag Copy Engine for QCA6174 and QCA9377."), we transfer large chunks of firmware memory using this mechanism. With large enough firmware segments, this becomes an exceedingly long period for disabling soft IRQs. For example, with a 500KiB firmware segment, in testing QCA6174A, I see 200 loop iterations of about 50-100us each, which can total about 10-20ms. In reality, we don't really need to block softirqs for this duration. The DIAG CE is only used in polling mode, and we only need to hold ce_lock to make sure any CE bookkeeping is done without screwing up another CE. Otherwise, we only need to ensure exclusion between ath10k_pci_diag_{read,write}_mem() contexts. This patch moves to use fine-grained locking for the shared ce_lock, while adding a new mutex just to ensure mutual exclusion of diag read/write operations. Tested on QCA6174A, firmware version WLAN.RM.4.4.1-00132-QCARMSWPZ-1. Fixes: 39501ea641 ("ath10k: download firmware via diag Copy Engine for QCA6174 and QCA9377.") Signed-off-by: Brian Norris <briannorris@chromium.org> Signed-off-by: Kalle Valo <kvalo@codeaurora.org>		2019-02-11 18:31:55 +02:00
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appletalk
arcnet
bonding	bonding: count master 3ad stats separately	2019-01-24 22:18:48 -08:00
caif	net: caif: call dev_consume_skb_any when skb xmit done	2019-01-29 10:09:28 -08:00
can	can: flexcan: fix NULL pointer exception during bringup	2019-01-22 11:35:33 +01:00
dsa	net: dsa: mv88e6xxx: Prevent suspend to RAM	2019-02-06 17:16:09 -08:00
ethernet	net: emac: remove IBM_EMAC_RX_SKB_HEADROOM	2019-02-06 19:50:41 -08:00
fddi
fjes
hamradio
hippi
hyperv	hv_netvsc: fix typos in code comments	2019-01-23 13:21:34 -05:00
ieee802154
ipvlan
netdevsim	netdevsim: Implement ndo_get_port_parent_id()	2019-02-06 14:17:03 -08:00
phy	net: phy: improve genphy_c45_read_link	2019-02-06 19:46:49 -08:00
plip
ppp	net: Fix usage of pskb_trim_rcsum	2019-01-18 14:05:14 -08:00
slip
team
usb	net: phy: fixed-phy: Drop GPIO from fixed_phy_add()	2019-02-04 18:33:36 -08:00
vmxnet3
wan	net: lmc: remove -I. header search path	2019-01-26 18:27:04 -08:00
wimax
wireless	ath10k: pci: use mutex for diagnostic window CE polling	2019-02-11 18:31:55 +02:00
xen-netback
dummy.c
eql.c
geneve.c
gtp.c
ifb.c
Kconfig	net: Fix typo in NET_FAILOVER help text	2019-01-18 14:06:29 -08:00
LICENSE.SRC
loopback.c
macsec.c
macvlan.c	macvlan: use netif_is_macvlan_port()	2019-01-31 09:26:31 -08:00
macvtap.c
Makefile
mdio.c
mii.c
net_failover.c
netconsole.c
nlmon.c
ntb_netdev.c
rionet.c
sb1000.c	sb1000: fix a couple of indentation issues and remove assignment in if statements	2019-01-17 21:51:36 -08:00
Space.c
sungem_phy.c
tap.c
thunderbolt.c
tun.c
veth.c
virtio_net.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2019-01-21 14:41:32 -08:00
vrf.c
vsockmon.c
vxlan.c	switchdev: Add extack argument to call_switchdev_notifiers()	2019-01-17 15:18:47 -08:00
xen-netfront.c