David Woodhouse 1f6ea6e511 solos-pci: Fix race condition in tasklet RX handling ... We were seeing faults in the solos-pci receive tasklet when packets arrived for a VCC which was currently being closed: [18842.727906] EIP: [<e082f490>] br2684_push+0x19/0x234 [br2684] SS:ESP 0068:dfb89d14 [18845.090712] [<c13ecff3>] ? do_page_fault+0x0/0x2e1 [18845.120042] [<e082f490>] ? br2684_push+0x19/0x234 [br2684] [18845.153530] [<e084fa13>] solos_bh+0x28b/0x7c8 [solos_pci] [18845.186488] [<e084f711>] ? solos_irq+0x2d/0x51 [solos_pci] [18845.219960] [<c100387b>] ? handle_irq+0x3b/0x48 [18845.247732] [<c10265cb>] ? irq_exit+0x34/0x57 [18845.274437] [<c1025720>] tasklet_action+0x42/0x69 [18845.303247] [<c102643f>] __do_softirq+0x8e/0x129 [18845.331540] [<c10264ff>] do_softirq+0x25/0x2a [18845.358274] [<c102664c>] _local_bh_enable_ip+0x5e/0x6a [18845.389677] [<c102666d>] local_bh_enable+0xb/0xe [18845.417944] [<e08490a8>] ppp_unregister_channel+0x32/0xbb [ppp_generic] [18845.458193] [<e08731ad>] pppox_unbind_sock+0x18/0x1f [pppox] This patch uses an RCU-inspired approach to fix it. In the RX tasklet's find_vcc() function we first refuse to use a VCC which already has the ATM_VF_READY bit cleared. And in the VCC close function, we synchronise with the tasklet to ensure that it can't still be using the VCC before we continue and allow the VCC to be destroyed. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com> Tested-by: Nathan Williams <nathan@traverse.com.au> Cc: stable@kernel.org Signed-off-by: David S. Miller <davem@davemloft.net>		2010-08-07 23:02:59 -07:00
..
.gitignore
adummy.c	atm/adummy: add syfs DEVICE_ATTR to change signal	2010-07-09 00:09:21 -07:00
ambassador.c	atm: Convert pci_table entries to PCI_VDEVICE (if PCI_ANY_ID is used)	2010-07-15 19:05:18 -07:00
ambassador.h
atmtcp.c	net: sk_sleep() helper	2010-04-20 16:37:13 -07:00
eni.c	atm: Convert pci_table entries to PCI_VDEVICE (if PCI_ANY_ID is used)	2010-07-15 19:05:18 -07:00
eni.h
firestream.c	atm: Convert pci_table entries to PCI_VDEVICE (if PCI_ANY_ID is used)	2010-07-15 19:05:19 -07:00
firestream.h
fore200e.c	of: Remove duplicate fields from of_platform_driver	2010-05-22 00:10:40 -06:00
fore200e.h
he.c	atm: Convert pci_table entries to PCI_VDEVICE (if PCI_ANY_ID is used)	2010-07-15 19:05:19 -07:00
he.h	atm: [he] rewrite buffer handling in receive path	2010-05-31 00:27:47 -07:00
horizon.c
horizon.h
idt77105.c	atm/idt77105.c: call atm_dev_signal_change() when signal changes.	2010-07-09 00:09:22 -07:00
idt77105.h
idt77252_tables.h
idt77252.c	atm: Convert pci_table entries to PCI_VDEVICE (if PCI_ANY_ID is used)	2010-07-15 19:05:20 -07:00
idt77252.h
iphase.c
iphase.h
Kconfig	atm: [nicstar] remove virt_to_bus() and support 64-bit platforms	2010-05-31 00:27:46 -07:00
lanai.c
Makefile
midway.h
nicstar.c	drivers: atm: don't use private copy of hex_to_bin()	2010-07-23 12:50:49 -07:00
nicstar.h	atm: [nicstar] remove virt_to_bus() and support 64-bit platforms	2010-05-31 00:27:46 -07:00
nicstarmac.c	atm: [nicstar] reformatted with Lindent	2010-05-31 00:27:46 -07:00
nicstarmac.copyright
solos-attrlist.c
solos-pci.c	solos-pci: Fix race condition in tasklet RX handling	2010-08-07 23:02:59 -07:00
suni.c	atm/suni.c: call atm_dev_signal_change() when signal changes.	2010-07-09 00:09:23 -07:00
suni.h
tonga.h
uPD98401.h
uPD98402.c
uPD98402.h
zatm.c	atm: Convert pci_table entries to PCI_VDEVICE (if PCI_ANY_ID is used)	2010-07-15 19:05:21 -07:00
zatm.h
zeprom.h