From b4563e891a043fe521e62f6f621b928641474ff3 Mon Sep 17 00:00:00 2001 From: Sebastian Ott Date: Fri, 26 Feb 2010 22:37:26 +0100 Subject: [S390] cio: wait for channel report To fetch a pending channel report word (crw) we use a kernel thread which triggers stcrw and sleeps on a semaphore. The s390 machine check handler uses crw_handle_channel_report to handle one crw if needed. This patch replaces the semaphore with a waitqueue (to block the kernel thread) and an atomic_t (to count the number of pending requests). By this we achieve the ability to force this thread to check for a pending crw (independent on when it is triggered by the machine check handler) and wait for this action to finish. Signed-off-by: Sebastian Ott Signed-off-by: Martin Schwidefsky --- arch/s390/include/asm/crw.h | 1 + 1 file changed, 1 insertion(+) (limited to 'arch/s390') diff --git a/arch/s390/include/asm/crw.h b/arch/s390/include/asm/crw.h index 2185a6d619d3..749a97e61bea 100644 --- a/arch/s390/include/asm/crw.h +++ b/arch/s390/include/asm/crw.h @@ -32,6 +32,7 @@ typedef void (*crw_handler_t)(struct crw *, struct crw *, int); extern int crw_register_handler(int rsc, crw_handler_t handler); extern void crw_unregister_handler(int rsc); extern void crw_handle_channel_report(void); +void crw_wait_for_channel_report(void); #define NR_RSCS 16 -- cgit v1.2.1