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

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commit 8130b9d7b9 upstream.

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.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Will Deacon 2012-01-30 20:23:29 +01:00 committed by Greg Kroah-Hartman
parent ae3939e12c
commit e358073331
1 changed files with 1 additions and 1 deletions
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2
arch/arm/kernel/ptrace.c
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@ -746,8 +746,8 @@ 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;
}