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    Subject[38/63] sh: Fix ptrace hw_breakpoint handling
    2.6.38-stable review patch.  If anyone has any objections, please let us know.

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

    From: David Engraf <david.engraf@sysgo.com>

    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@sysgo.com>
    Signed-off-by: Paul Mundt <lethal@linux-sh.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

    ---
    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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