Hendrik Brueckner d28ecab0c4 iucv: fix iucv_buffer_cpumask check when calling IUCV functions ... Prior to calling IUCV functions, the DECLARE BUFFER function must have been called for at least one CPU to receive IUCV interrupts. With commit "iucv: establish reboot notifier" (6c005961), a check has been introduced to avoid calling IUCV functions if the current CPU does not have an interrupt buffer declared. Because one interrupt buffer is sufficient, change the condition to ensure that one interrupt buffer is available. In addition, checking the buffer on the current CPU creates a race with CPU up/down notifications: before checking the buffer, the IUCV function might be interrupted by an smp_call_function() that retrieves the interrupt buffer for the current CPU. When the IUCV function continues, the check fails and -EIO is returned. If a buffer is available on any other CPU, the IUCV function call must be invoked (instead of failing with -EIO). Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2009-09-16 20:57:31 -07:00
..
af_iucv.c	net: constify remaining proto_ops	2009-09-14 17:03:09 -07:00
iucv.c	iucv: fix iucv_buffer_cpumask check when calling IUCV functions	2009-09-16 20:57:31 -07:00
Kconfig	[AF_IUCV]: Improve description of IUCV and AFIUCV configuration options.	2007-07-14 19:03:00 -07:00
Makefile	[S390]: Add AF_IUCV socket support	2007-02-08 13:51:54 -08:00