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* br2684: fix scheduling while atomicKarl Hiramoto2010-09-26
| | | | | | | | | | | | | | You can't call atomic_notifier_chain_unregister() while in atomic context. Fix, call un/register_atmdevice_notifier in module __init and __exit. Bug report: http://comments.gmane.org/gmane.linux.network/172603 Reported-by: Mikko Vinni <mmvinni@yahoo.com> Tested-by: Mikko Vinni <mmvinni@yahoo.com> Signed-off-by: Karl Hiramoto <karl@hiramoto.org> Signed-off-by: David S. Miller <davem@davemloft.net>
* ppp: make channel_ops conststephen hemminger2010-08-05
| | | | | | | | The PPP channel ops structure should be const. Cleanup the declarations to use standard C99 format. Signed-off-by: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* atm/br2684: register notifier event for carrier signal changes.Karl Hiramoto2010-07-09
| | | | | | | When a signal change event occurs call netif_carrier_on/off. Signed-off-by: Karl Hiramoto <karl@hiramoto.org> Signed-off-by: David S. Miller <davem@davemloft.net>
* atm: propagate signal changes via notifierKarl Hiramoto2010-07-09
| | | | | | | | | | | | | | | Add notifier chain for changes in atm_dev. Clients like br2684 will call register_atmdevice_notifier() to be notified of changes. Drivers will call atm_dev_signal_change() to notify clients like br2684 of the change. On DSL and ATM devices it's usefull to have a know if you have a carrier signal. netdevice LOWER_UP changes can be propagated to userspace via netlink monitor. Signed-off-by: Karl Hiramoto <karl@hiramoto.org> Signed-off-by: David S. Miller <davem@davemloft.net>
* net-next: remove useless union keywordChangli Gao2010-06-11
| | | | | | | | | | remove useless union keyword in rtable, rt6_info and dn_route. Since there is only one member in a union, the union keyword isn't useful. Signed-off-by: Changli Gao <xiaosuo@gmail.com> Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: Remove unnecessary returns from void function()sJoe Perches2010-05-18
| | | | | | | | | | | | | | | | This patch removes from net/ (but not any netfilter files) all the unnecessary return; statements that precede the last closing brace of void functions. It does not remove the returns that are immediately preceded by a label as gcc doesn't like that. Done via: $ grep -rP --include=*.[ch] -l "return;\n}" net/ | \ xargs perl -i -e 'local $/ ; while (<>) { s/\n[ \t\n]+return;\n}/\n}/g; print; }' Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: sock_def_readable() and friends RCU conversionEric Dumazet2010-05-01
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | sk_callback_lock rwlock actually protects sk->sk_sleep pointer, so we need two atomic operations (and associated dirtying) per incoming packet. RCU conversion is pretty much needed : 1) Add a new structure, called "struct socket_wq" to hold all fields that will need rcu_read_lock() protection (currently: a wait_queue_head_t and a struct fasync_struct pointer). [Future patch will add a list anchor for wakeup coalescing] 2) Attach one of such structure to each "struct socket" created in sock_alloc_inode(). 3) Respect RCU grace period when freeing a "struct socket_wq" 4) Change sk_sleep pointer in "struct sock" by sk_wq, pointer to "struct socket_wq" 5) Change sk_sleep() function to use new sk->sk_wq instead of sk->sk_sleep 6) Change sk_has_sleeper() to wq_has_sleeper() that must be used inside a rcu_read_lock() section. 7) Change all sk_has_sleeper() callers to : - Use rcu_read_lock() instead of read_lock(&sk->sk_callback_lock) - Use wq_has_sleeper() to eventually wakeup tasks. - Use rcu_read_unlock() instead of read_unlock(&sk->sk_callback_lock) 8) sock_wake_async() is modified to use rcu protection as well. 9) Exceptions : macvtap, drivers/net/tun.c, af_unix use integrated "struct socket_wq" instead of dynamically allocated ones. They dont need rcu freeing. Some cleanups or followups are probably needed, (possible sk_callback_lock conversion to a spinlock for example...). Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: sk_sleep() helperEric Dumazet2010-04-20
| | | | | | | | | | | | | | | | | Define a new function to return the waitqueue of a "struct sock". static inline wait_queue_head_t *sk_sleep(struct sock *sk) { return sk->sk_sleep; } Change all read occurrences of sk_sleep by a call to this function. Needed for a future RCU conversion. sk_sleep wont be a field directly available. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* Merge branch 'master' of ↵David S. Miller2010-04-11
|\ | | | | | | | | | | | | | | | | | | | | | | master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 Conflicts: drivers/net/stmmac/stmmac_main.c drivers/net/wireless/wl12xx/wl1271_cmd.c drivers/net/wireless/wl12xx/wl1271_main.c drivers/net/wireless/wl12xx/wl1271_spi.c net/core/ethtool.c net/mac80211/scan.c
| * include cleanup: Update gfp.h and slab.h includes to prepare for breaking ↵Tejun Heo2010-03-30
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
* | atm: Use kasprintfEric Dumazet2010-03-21
|/ | | | | | | Use kasprintf in atm_proc_dev_register() Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: atm: use seq_list_foo() helpersLi Zefan2010-02-10
| | | | | | | Simplify seq_file code. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net/atm: Cleanup dprint/ddprintk #defines and usesJoe Perches2010-01-27
| | | | | | | | | Move "mpoa:%s: ", __func__/__FILE__ to #defines Remove mpoa __func__/__FILE__ from dprintk uses Add and use #define dprint_cont where appropriate Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net/atm/lec.c: Add __lec_arp_check_expire and other cleanupsJoe Perches2010-01-27
| | | | | | | | | Reduce indentation in lec_arp_check_expire Indent a case label Remove != NULL logical tests from while ((skb = foo())) assign and tests Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net/atm/svc.c: checkpatch cleanupsJoe Perches2010-01-27
| | | | | | | | | | | Convert #include <asm... to #include <linux... Spacing cleanups Mostly 80 column wrapped Move trailing statements to new lines switch/case cleanups Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net/atm/signaling.c: checkpatch cleanupsJoe Perches2010-01-27
| | | | | | | | | | Mostly 80 column wrapped. Move embedded assigns out of tests Move trailing statements to new lines switch/case cleanups Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net/atm/resources.c: checkpatch cleanupsJoe Perches2010-01-27
| | | | | | | | | | | Spacing cleanups Mostly 80 column wrapped. Move embedded assigns out of tests Move trailing statements to new lines switch/case cleanups Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net/atm/raw.c: checkpatch cleanupsJoe Perches2010-01-27
| | | | | | | | Spacing cleanups Mostly 80 column wrapped. Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net/atm/pvc.c: checkpatch cleanupsJoe Perches2010-01-27
| | | | | | | | | Spacing cleanups Mostly 80 column wrapped. Move trailing statements to new lines Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net/atm/proc.c: checkpatch cleanupsJoe Perches2010-01-27
| | | | | | | | | | | Convert #include <asm... to #include <linux... Mostly 80 column wrapped. Spacing cleanups Move trailing statements to new lines switch/case cleanups Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net/atm/pppoatm.c: checkpatch cleanupsJoe Perches2010-01-27
| | | | | | | | | Move embedded assigns out of tests Move trailing statements to new lines Move labels to column 1 Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net/atm/mpoa_proc.c: checkpatch cleanupsJoe Perches2010-01-27
| | | | | | | | | | | | Convert #include <asm... to #include <linux... Add printk argument verification to dprintk and ddprintk Spacing cleanups Mostly 80 column wrapped. Removed unnecessary breaks after returns Use %pI4 in seq_printf of IP address Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net/atm/mpoa_caches.c: checkpatch cleanupsJoe Perches2010-01-27
| | | | | | | | | | Convert #include <asm... to #include <linux... Add printk argument verification to dprintk and ddprintk Spacing cleanups Mostly 80 column wrapped. Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net/atm/mpc.c: checkpatch cleanupsJoe Perches2010-01-27
| | | | | | | | | | | | | | | | Convert #include <asm... to #include <linux... Add printk argument verification to dprintk and ddprintk Spacing cleanups Mostly 80 column wrapped. printk->pr_info and pr_cont Moved labels to column 1 Move trailing statements to new lines switch/case cleanups remove unnecessary breaks after returns Remove unnecessary braces around single line statements Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net/atm/lec.c: checkpatch cleanupsJoe Perches2010-01-27
| | | | | | | | | | | | | | | | | | Convert #include <asm... to #include <linux... Mostly 80 column wrapped. Spacing cleanups Convert printks to pr_<level> Use print_hex_dump Move embedded assigns out of tests Move trailing statements to new lines Remove unnecessary braces around single line statements switch/case cleanups Removed paren around returns Use %pM Moved leading continuation logical tests to end of previous line Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net/atm/ioctl.c: checkpatch cleanupsJoe Perches2010-01-27
| | | | | | | | | | Spacing cleanups Moved EXPORT_SYMBOL Mostly 80 column wrapped. switch/case cleanups Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net/atm/common.c: checkpatch cleanupsJoe Perches2010-01-27
| | | | | | | | | | | | | Convert #include <asm... to #include <linux... Move EXPORT_SYMBOL Spacing cleanups Use __func__ in printks Indent switch/case statements Move trailing statements to new line Hoist assigns from if tests Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net/atm/clip.c: checkpatch cleanupsJoe Perches2010-01-27
| | | | | | | | | | Convert #include <asm... to #include <linux... Spacing cleanups Move labels to column 1 Move logical continuation tests to end of previous line Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net/atm/br2684.c: checkpatch cleanupsJoe Perches2010-01-27
| | | | | | | | | | | | | Convert #include <asm... to #include <linux... Use print_hex_dump Spacing cleanups Move logical continuation tests to end of previous line 80 column wrapping Move goto branch label to column 1 Remove unnecessary single statement braces Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net/atm/atm_sysfs.c: checkpatch cleanupsJoe Perches2010-01-27
| | | | | | | | | Add space after for Indent switch/case statements 80 column wrapping Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net/atm/atm_misc.c: checkpatch cleanupsJoe Perches2010-01-27
| | | | | | | | Moved EXPORT_SYMBOL to follow definition Add space after commas Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net/atm/addr.c: Convert include <asm to include <linuxJoe Perches2010-01-27
| | | | | Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net/atm: Convert printk to pr_<level>Joe Perches2010-01-27
| | | | | | | | | Add #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__ Remove function names from output Use single line pr_debug instead of broken multiple uses without newline Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* atm: [br2684] allow routed mode operation againchas williams - CONTRACTOR2009-12-08
| | | | | | | | | in routed mode, we don't have a hardware address so netdev_ops doesnt need to validate our hardware address via .ndo_validate_addr Reported-by: Manuel Fuentes <mfuentes@agenciaefe.com> Signed-off-by: Chas Williams - CONTRACTOR <chas@cmf.nrl.navy.mil> Signed-off-by: David S. Miller <davem@davemloft.net>
* atm: [lec] initialize .netdev_ops before calling register_netdev()chas williams - CONTRACTOR2009-12-08
| | | | | | | | fix oops when initializing lane interfaces. lec should probably be changed to use alloc_netdev() instead. Signed-off-by: Chas Williams - CONTRACTOR <chas@cmf.nrl.navy.mil> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: use net_eq to compare netsOctavian Purdila2009-11-25
| | | | | | | | | | | | | | | | | | | | | | | Generated with the following semantic patch @@ struct net *n1; struct net *n2; @@ - n1 == n2 + net_eq(n1, n2) @@ struct net *n1; struct net *n2; @@ - n1 != n2 + !net_eq(n1, n2) applied over {include,net,drivers/net}. Signed-off-by: Octavian Purdila <opurdila@ixiacom.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net/atm: move all compat_ioctl handling to atm/ioctl.cArnd Bergmann2009-11-11
| | | | | | | | | | | | | | | | | | | | | | | | | We have two implementations of the compat_ioctl handling for ATM, the one that we have had for ages in fs/compat_ioctl.c and the one added to net/atm/ioctl.c by David Woodhouse. Unfortunately, both versions are incomplete, and in practice we use a very confusing combination of the two. For ioctl numbers that have the same identifier on 32 and 64 bit systems, we go directly through the compat_ioctl socket operation, for those that differ, we do a conversion in fs/compat_ioctl.c. This patch moves both variants into the vcc_compat_ioctl() function, while preserving the current behaviour. It also kills off the COMPATIBLE_IOCTL definitions that we never use here. Doing it this way is clearly not a good solution, but I hope it is a step into the right direction, so that someone is able to clean up this mess for real. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Cc: Eric Dumazet <eric.dumazet@gmail.com> Cc: David Woodhouse <dwmw2@infradead.org> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: pass kern to net_proto_family create functionEric Paris2009-11-06
| | | | | | | | | | | The generic __sock_create function has a kern argument which allows the security system to make decisions based on if a socket is being created by the kernel or by userspace. This patch passes that flag to the net_proto_family specific create function, so it can do the same thing. Signed-off-by: Eric Paris <eparis@redhat.com> Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: Generalize socket rx gap / receive queue overflow cmsgNeil Horman2009-10-12
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Create a new socket level option to report number of queue overflows Recently I augmented the AF_PACKET protocol to report the number of frames lost on the socket receive queue between any two enqueued frames. This value was exported via a SOL_PACKET level cmsg. AFter I completed that work it was requested that this feature be generalized so that any datagram oriented socket could make use of this option. As such I've created this patch, It creates a new SOL_SOCKET level option called SO_RXQ_OVFL, which when enabled exports a SOL_SOCKET level cmsg that reports the nubmer of times the sk_receive_queue overflowed between any two given frames. It also augments the AF_PACKET protocol to take advantage of this new feature (as it previously did not touch sk->sk_drops, which this patch uses to record the overflow count). Tested successfully by me. Notes: 1) Unlike my previous patch, this patch simply records the sk_drops value, which is not a number of drops between packets, but rather a total number of drops. Deltas must be computed in user space. 2) While this patch currently works with datagram oriented protocols, it will also be accepted by non-datagram oriented protocols. I'm not sure if thats agreeable to everyone, but my argument in favor of doing so is that, for those protocols which aren't applicable to this option, sk_drops will always be zero, and reporting no drops on a receive queue that isn't used for those non-participating protocols seems reasonable to me. This also saves us having to code in a per-protocol opt in mechanism. 3) This applies cleanly to net-next assuming that commit 977750076d98c7ff6cbda51858bb5a5894a9d9ab (my af packet cmsg patch) is reverted Signed-off-by: Neil Horman <nhorman@tuxdriver.com> Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: mark net_proto_ops as constStephen Hemminger2009-10-07
| | | | | | | All usages of structure net_proto_ops should be declared const. Signed-off-by: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: Make setsockopt() optlen be unsigned.David S. Miller2009-09-30
| | | | | | | | | | | | This provides safety against negative optlen at the type level instead of depending upon (sometimes non-trivial) checks against this sprinkled all over the the place, in each and every implementation. Based upon work done by Arjan van de Ven and feedback from Linus Torvalds. Signed-off-by: David S. Miller <davem@davemloft.net>
* atm/br2684: netif_stop_queue() when atm device busy and netif_wake_queue() ↵Karl Hiramoto2009-09-03
| | | | | | | | | | | | | when we can send packets again. This patch removes the call to dev_kfree_skb() when the atm device is busy. Calling dev_kfree_skb() causes heavy packet loss then the device is under heavy load, the more correct behavior should be to stop the upper layers, then when the lower device can queue packets again wake the upper layers. Signed-off-by: Karl Hiramoto <karl@hiramoto.org> Signed-off-by: Chas Williams <chas@cmf.nrl.navy.mil> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: make neigh_ops constantStephen Hemminger2009-09-01
| | | | | | | | These tables are never modified at runtime. Move to read-only section. Signed-off-by: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* convert ATM drivers to netdev_tx_tStephen Hemminger2009-09-01
| | | | | Signed-off-by: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: mark read-only arrays as constJan Engelhardt2009-08-05
| | | | | | | | String literals are constant, and usually, we can also tag the array of pointers const too, moving it to the .rodata section. Signed-off-by: Jan Engelhardt <jengelh@medozas.de> Signed-off-by: David S. Miller <davem@davemloft.net>
* Merge branch 'master' of ↵David S. Miller2009-07-09
|\ | | | | | | master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
| * net: adding memory barrier to the poll and receive callbacksJiri Olsa2009-07-09
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Adding memory barrier after the poll_wait function, paired with receive callbacks. Adding fuctions sock_poll_wait and sk_has_sleeper to wrap the memory barrier. Without the memory barrier, following race can happen. The race fires, when following code paths meet, and the tp->rcv_nxt and __add_wait_queue updates stay in CPU caches. CPU1 CPU2 sys_select receive packet ... ... __add_wait_queue update tp->rcv_nxt ... ... tp->rcv_nxt check sock_def_readable ... { schedule ... if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) wake_up_interruptible(sk->sk_sleep) ... } If there was no cache the code would work ok, since the wait_queue and rcv_nxt are opposit to each other. Meaning that once tp->rcv_nxt is updated by CPU2, the CPU1 either already passed the tp->rcv_nxt check and sleeps, or will get the new value for tp->rcv_nxt and will return with new data mask. In both cases the process (CPU1) is being added to the wait queue, so the waitqueue_active (CPU2) call cannot miss and will wake up CPU1. The bad case is when the __add_wait_queue changes done by CPU1 stay in its cache, and so does the tp->rcv_nxt update on CPU2 side. The CPU1 will then endup calling schedule and sleep forever if there are no more data on the socket. Calls to poll_wait in following modules were ommited: net/bluetooth/af_bluetooth.c net/irda/af_irda.c net/irda/irnet/irnet_ppp.c net/mac80211/rc80211_pid_debugfs.c net/phonet/socket.c net/rds/af_rds.c net/rfkill/core.c net/sunrpc/cache.c net/sunrpc/rpc_pipe.c net/tipc/socket.c Signed-off-by: Jiri Olsa <jolsa@redhat.com> Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | net: convert remaining non-symbolic return values in ndo_start_xmit() functionsPatrick McHardy2009-07-05
| | | | | | | | | | | | | | | | | | | | | | | | This patch converts the remaining occurences of raw return values to their symbolic counterparts in ndo_start_xmit() functions that were missed by the previous automatic conversion. Additionally code that assumed the symbolic value of NETDEV_TX_OK to be zero is changed to explicitly use NETDEV_TX_OK. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
* | net: use NETDEV_TX_OK instead of 0 in ndo_start_xmit() functionsPatrick McHardy2009-07-05
|/ | | | | | | | | | | This patch is the result of an automatic spatch transformation to convert all ndo_start_xmit() return values of 0 to NETDEV_TX_OK. Some occurences are missed by the automatic conversion, those will be handled in a seperate patch. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
* atm: sk_wmem_alloc initial value is oneEric Dumazet2009-06-18
| | | | | | | | | | | | commit 2b85a34e911bf483c27cfdd124aeb1605145dc80 (net: No more expensive sock_hold()/sock_put() on each tx) changed initial sk_wmem_alloc value. This broke net/atm since this protocol assumed a null initial value. This patch makes necessary changes. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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