ARM: hw_breakpoint: fix ordering of debug register reset sequence

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The debug register reset sequence for v7 and v7.1 is congruent with
tap-dancing through a minefield.

Rather than wait until we've blown ourselves to pieces, this patch
instead checks the debug_err_mask after each potentially faulting
operation. We also move the enabling of monitor_mode to the end of the
sequence in order to prevent spurious debug events generated by UNKNOWN
register values.

Reported-by: Stephen Boyd <sboyd@codeaurora.org>
Tested-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>

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This commit is contained in:

Will Deacon 2012-09-21 15:38:26 +01:00

parent b59a540ca9

commit 614bea500a

1 changed files with 26 additions and 10 deletions

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36

arch/arm/kernel/hw_breakpoint.c

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