hw-breakpoints: Simplify error handling in breakpoint creation requests

This simplifies the error handling when we create a breakpoint.
We don't need to check the NULL return value corner case anymore
since we have improved perf_event_create_kernel_counter() to
always return an error code in the failure case.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Prasad <prasad@linux.vnet.ibm.com>
LKML-Reference: <1259210142-5714-3-git-send-regression-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 2 insertions, 2 deletions

diff --git a/kernel/hw_breakpoint.c b/kernel/hw_breakpoint.c
index 06d372fc026d..dd3fb4a999d3 100644
--- a/kernel/hw_breakpoint.c
+++ b/kernel/hw_breakpoint.c
@@ -442,7 +442,7 @@ register_wide_hw_breakpoint(unsigned long addr,
 
                 *pevent = bp;
 
-                if (IS_ERR(bp) || !bp) {
+                if (IS_ERR(bp)) {
                         err = PTR_ERR(bp);
                         goto fail;
                 }
@@ -453,7 +453,7 @@ register_wide_hw_breakpoint(unsigned long addr,
 fail:
         for_each_possible_cpu(cpu) {
                 pevent = per_cpu_ptr(cpu_events, cpu);
-                if (IS_ERR(*pevent) || !*pevent)
+                if (IS_ERR(*pevent))
                         break;
                 unregister_hw_breakpoint(*pevent);
         }