lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

[AF_IUCV/IUCV]: smp_call_function deadlock

Browse Source 
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>
This commit is contained in:
Martin Schwidefsky
2007-04-28 23:03:59 -07:00
committed by David S. Miller
parent d0772b70fa
commit 04b090d50c
2 changed files with 133 additions and 74 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
include/net/iucv/iucv.h
View File

@@ -16,7 +16,7 @@
* completed a register, it can exploit the other functions.
* For furthur reference on all IUCV functionality, refer to the
* CP Programming Services book, also available on the web thru
* www.ibm.com/s390/vm/pubs, manual # SC24-5760
* www.vm.ibm.com/pubs, manual # SC24-6084
*
* Definition of Return Codes
* - All positive return codes including zero are reflected back