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kdb: Don't back trace on a cpu that didn't round up

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If you have a CPU that fails to round up and then run 'btc' you'll end
up crashing in kdb becaue we dereferenced NULL.  Let's add a check.
It's wise to also set the task to NULL when leaving the debugger so
that if we fail to round up on a later entry into the debugger we
won't backtrace a stale task.

Signed-off-by: Douglas Anderson <dianders@chromium.org>
Acked-by: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
This commit is contained in:
Douglas Anderson 2018-12-04 19:38:28 -08:00 • committed by Daniel Thompson
parent 87b0959285
commit 162bc7f5af
3 changed files with 14 additions and 8 deletions
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4
kernel/debug/debug_core.c
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@ -592,6 +592,8 @@ return_normal:
arch_kgdb_ops.correct_hw_break();
if (trace_on)
tracing_on();
kgdb_info[cpu].debuggerinfo = NULL;
kgdb_info[cpu].task = NULL;
kgdb_info[cpu].exception_state &=
~(DCPU_WANT_MASTER | DCPU_IS_SLAVE);
kgdb_info[cpu].enter_kgdb--;
@ -724,6 +726,8 @@ kgdb_restore:
if (trace_on)
tracing_on();
kgdb_info[cpu].debuggerinfo = NULL;
kgdb_info[cpu].task = NULL;
kgdb_info[cpu].exception_state &=
~(DCPU_WANT_MASTER | DCPU_IS_SLAVE);
kgdb_info[cpu].enter_kgdb--;