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UPSTREAM: MIPS: smp-cps: Stop printing EJTAG exceptions to UART

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When CONFIG_MIPS_CPS_NS16550 is enabled, some register state is dumped
to the UART when an exception is taken via the BEV on secondary cores.
EJTAG exceptions are architecturally expected to be handled by the BEV
even when Status.BEV is 0. This effectively means that if userland
executes an sdbbp instruction on a secondary core then the kernel dumps
register state to the UART even though the exception is perfectly normal
& expected. Prevent this by simply not dumping information to the UART
for EJTAG exceptions.

Fixes: 609cf6f229 ("MIPS: CPS: Early debug using an ns16550-compatible UART")
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/12341/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
(cherry picked from commit 6609ccdc85)
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
This commit is contained in:
Paul Burton
2016-02-03 03:15:35 +00:00
committed by Amit Pundir
parent 719cc46f2c
commit 7725869677
1 changed files with 0 additions and 1 deletions
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arch/mips/kernel/cps-vec.S
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@@ -223,7 +223,6 @@ LEAF(excep_intex)
.org 0x480
LEAF(excep_ejtag)
DUMP_EXCEP("EJTAG")
PTR_LA k0, ejtag_debug_handler
jr k0
nop