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2008-04-10iucv: Delay bus registration until core is ready.Cornelia Huck
If we register the iucv bus after the infrastructure is ready, userspace can start relying on it when it receives the uevent for the bus. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Ursula Braun <braunu@de.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-04-10iucv: get rid of in_atomic() use.Heiko Carstens
This BUG_ON is not needed, since all (debug) checks are also done in smp_call_function() which gets called by this function. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Ursula Braun <braunu@de.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-03-03iucv: fix build error on !SMPHeiko Carstens
Since a5fbb6d1064be885d2a6b82f625186753cf74848 "KVM: fix !SMP build error" smp_call_function isn't a define anymore that folds into nothing but a define that calls up_smp_call_function with all parameters. Hence we cannot #ifdef out the unused code anymore... This seems to be the preferred method, so do this for s390 as well. net/iucv/iucv.c: In function 'iucv_cleanup_queue': net/iucv/iucv.c:657: error: '__iucv_cleanup_queue' undeclared Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net> Signed-off-by: Ursula Braun <braunu@de.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-02-07[IUCV]: wrong irq-disabling locking at module load timeUrsula Braun
Linux may hang when running af_iucv socket programs concurrently with a load of module netiucv. iucv_register() tries to take the iucv_table_lock with spin_lock_irq. This conflicts with iucv_connect() which has a need for an smp_call_function while holding the iucv_table_lock. Solution: use bh-disabling locking in iucv_register() Signed-off-by: Ursula Braun <braunu@de.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-01-28[IUCV]: use LIST_HEAD instead of LIST_HEAD_INITDenis Cheng
these three list_head are all local variables, but can also use LIST_HEAD. Signed-off-by: Denis Cheng <crquan@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-11-20[S390] Explicitly code allocpercpu calls in iucvChristoph Lameter
The iucv is the only user of the various functions that are used to bring parts of cpus up and down. Its the only allocpercpu user that will do I/O on per cpu objects (which is difficult to do with virtually mapped memory). And its the only use of allocpercpu where a GFP_DMA allocation is done. Remove the allocpercpu calls from iucv and code the allocation and freeing manually. After this patch it is possible to remove a large part of the allocpercpu API. Signed-off-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2007-10-19Fix misspellings of "system", "controller", "interrupt" and "necessary".Robert P. J. Day
Fix the various misspellings of "system", controller", "interrupt" and "[un]necessary". Signed-off-by: Robert P. J. Day <rpjday@mindspring.com> Signed-off-by: Adrian Bunk <bunk@kernel.org>
2007-07-27[S390] Convert to smp_call_function_single.Heiko Carstens
smp_call_function_single now has the same semantics as s390's smp_call_function_on. Therefore convert to the *single variant and get rid of some architecture specific code. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2007-07-14[AF_IUCV]: Avoid deadlock between iucv_path_connect and tasklet.Ursula Braun
An iucv deadlock may occur, where one CPU is spinning on the iucv_table_lock for iucv_tasklet_fn(), while another CPU is holding the iucv_table_lock for an iucv_path_connect() and is waiting for the first CPU in an smp_call_function. Solution: replace spin_lock in iucv_tasklet_fn by spin_trylock and reschedule tasklet in case of non-granted lock. Signed-off-by: Ursula Braun <braunu@de.ibm.com> Acked-by: Frank Pavlic <fpavlic@de.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-05-09Add suspend-related notifications for CPU hotplugRafael J. Wysocki
Since nonboot CPUs are now disabled after tasks and devices have been frozen and the CPU hotplug infrastructure is used for this purpose, we need special CPU hotplug notifications that will help the CPU-hotplug-aware subsystems distinguish normal CPU hotplug events from CPU hotplug events related to a system-wide suspend or resume operation in progress. This patch introduces such notifications and causes them to be used during suspend and resume transitions. It also changes all of the CPU-hotplug-aware subsystems to take these notifications into consideration (for now they are handled in the same way as the corresponding "normal" ones). [oleg@tv-sign.ru: cleanups] Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Cc: Gautham R Shenoy <ego@in.ibm.com> Cc: Pavel Machek <pavel@ucw.cz> Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-05-04[AF_IUCV/IUCV] : Add missing section annotationsHeiko Carstens
Add missing section annotations and found and fixed some Coding Style issues. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Frank Pavlic <fpavlic@de.ibm.com>
2007-04-28[AF_IUCV/IUCV]: smp_call_function deadlockMartin Schwidefsky
Calling smp_call_function can lead to a deadlock if it is called from tasklet context. Fixing this deadlock requires to move the smp_call_function from the tasklet context to a work queue. To do that queue the path pending interrupts to a separate list and move the path cleanup out of iucv_path_sever to iucv_path_connect and iucv_path_pending. This creates a new requirement for iucv_path_connect: it may not be called from tasklet context anymore. Also fixed compile problem for CONFIG_HOTPLUG_CPU=n and another one when walking the cpu_online mask. When doing this, we must disable cpu hotplug. Signed-off-by: Frank Pavlic <fpavlic@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-04-26[AF_IUCV]: Fix compilation on s390-upAlexey Dobriyan
CC [M] net/iucv/iucv.o net/iucv/iucv.c: In function 'iucv_init': net/iucv/iucv.c:1556: error: 'iucv_cpu_notifier' undeclared (first use in this function) Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-02-08[S390]: Rewrite of the IUCV base code, part 2Martin Schwidefsky
Add rewritten IUCV base code to net/iucv. Signed-off-by: Frank Pavlic <fpavlic@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>