[34/55] sh: Fix ptrace hw_breakpoint handling

[Greg KH]

2.6.37-stable review patch.  If anyone has any objections, please let us know.

------------------

From: David Engraf <david.engraf@xxxxxxxxx>

commit fb7f045ace0624f1e59a7db8497e460bd54b1cbc upstream.

Since commit 34d0b5af50a063cded842716633501b38ff815fb it is no longer
possible to debug an application using singlestep. The old commit
converted singlestep handling via ptrace to hw_breakpoints. The
hw_breakpoint is disabled when an event is triggered and not re-enabled
again. This patch re-enables the existing hw_breakpoint before the
existing breakpoint is reused.

Signed-off-by: David Engraf <david.engraf@xxxxxxxxx>
Signed-off-by: Paul Mundt <lethal@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 arch/sh/kernel/ptrace_32.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/arch/sh/kernel/ptrace_32.c
+++ b/arch/sh/kernel/ptrace_32.c
@@ -101,6 +101,8 @@ static int set_single_step(struct task_s
 
 		attr = bp->attr;
 		attr.bp_addr = addr;
+		/* reenable breakpoint */
+		attr.disabled = false;
 		err = modify_user_hw_breakpoint(bp, &attr);
 		if (unlikely(err))
 			return err;


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