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ARM: 7308/1: vfp: flush thread hwstate before copying ptrace registers

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If we are context switched whilst copying into a thread's
vfp_hard_struct then the partial copy may be corrupted by the VFP
context switching code (see "ARM: vfp: flush thread hwstate before
restoring context from sigframe").

This patch updates the ptrace VFP set code so that the thread state is
flushed before the copy, therefore disabling VFP and preventing
corruption from occurring.

Cc: stable <stable@vger.kernel.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Will Deacon 2012-01-30 20:23:29 +01:00 committed by Russell King
parent 247f4993a5
commit 8130b9d7b9
1 changed files with 1 additions and 1 deletions
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2
arch/arm/kernel/ptrace.c
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@ -726,8 +726,8 @@ static int vfp_set(struct task_struct *target,
if (ret)
return ret;
thread->vfpstate.hard = new_vfp;
vfp_flush_hwstate(thread);
thread->vfpstate.hard = new_vfp;
return 0;
}