arm64: compat: fix stxr failure case in SWP emulation

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commit 589cb22bbe upstream.

If the STXR instruction fails in the SWP emulation code, we leave *data
overwritten with the loaded value, therefore corrupting the data written
by a subsequent, successful attempt.

This patch re-jigs the code so that we only write back to *data once we
know that the update has happened.

Fixes: bd35a4adc4 ("arm64: Port SWP/SWPB emulation support from arm")
Reported-by: Shengjiu Wang <shengjiu.wang@freescale.com>
Reported-by: Vladimir Murzin <vladimir.murzin@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Will Deacon 2015-10-15 13:55:53 +01:00 • committed by Greg Kroah-Hartman

parent dbf2a8c020

commit 599f528a90

1 changed files with 10 additions and 8 deletions

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arch/arm64/kernel/armv8_deprecated.c

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