[PATCH] sh: Fix ptrace hw_breakpoint handling

[David Engraf <david.engraf@sysgo.com>]

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sh: Fix ptrace hw_breakpoint handling.

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@sysgo.com>


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diff --git a/arch/sh/kernel/ptrace_32.c b/arch/sh/kernel/ptrace_32.c
index 90a15d2..e3bd670 100644
--- 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_struct *tsk, unsigned long addr)
 
 		attr = bp->attr;
 		attr.bp_addr = addr;
+		/* reenable breakpoint */
+		attr.disabled = false;
 		err = modify_user_hw_breakpoint(bp, &attr);
 		if (unlikely(err))
 			return err;