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authorstephane.eranian@hp.com <stephane.eranian@hp.com>2005-07-28 05:18:00 -0700
committerTony Luck <tony.luck@intel.com>2005-08-10 16:21:58 -0700
commit6bf11e8c708f0e512ed733fc65a50770c5bc7b54 (patch)
treeefa54f2f19580f330ae71c3a9476d2261b172142 /arch/ia64
parentbc68552faad0e134eb22281343d5ae5a4873fa80 (diff)
downloadop-kernel-dev-6bf11e8c708f0e512ed733fc65a50770c5bc7b54.zip
op-kernel-dev-6bf11e8c708f0e512ed733fc65a50770c5bc7b54.tar.gz
[IA64] fix perfmon context load
The PFM_LOAD_CONTEXT may fail silently and cause a session to remain reserved even though it should not. This can happen when the commands succeeds in reserving the session but fails when it actually tries to attach to the load_pid. In that case, the command has failed but will return 0. More importantly, the session will remain reserved. This patch fixes the problem. Signed-off-by: <stephane.eranian@hp.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'arch/ia64')
-rw-r--r--arch/ia64/kernel/perfmon.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/ia64/kernel/perfmon.c b/arch/ia64/kernel/perfmon.c
index b8ebb8e..f1201ac 100644
--- a/arch/ia64/kernel/perfmon.c
+++ b/arch/ia64/kernel/perfmon.c
@@ -4312,6 +4312,7 @@ pfm_context_load(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
DPRINT(("before cmpxchg() old_ctx=%p new_ctx=%p\n",
thread->pfm_context, ctx));
+ ret = -EBUSY;
old = ia64_cmpxchg(acq, &thread->pfm_context, NULL, ctx, sizeof(pfm_context_t *));
if (old != NULL) {
DPRINT(("load_pid [%d] already has a context\n", req->load_pid));
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