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authorSebastian Ott <sebott@linux.vnet.ibm.com>2010-02-26 22:37:26 +0100
committerMartin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com>2010-02-26 22:37:29 +0100
commitb4563e891a043fe521e62f6f621b928641474ff3 (patch)
tree3f3af60351bed04d68f69ccd24f14b85fc2c4f81 /arch/s390
parent879acca58a904c25487c89ab11e23eb556fb13d3 (diff)
[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 <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390')
-rw-r--r--arch/s390/include/asm/crw.h1
1 files changed, 1 insertions, 0 deletions
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