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ARM: 9425/1: vfp: Use vfp_state_hold() in vfp_support_entry().

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vfp_entry() is invoked from exception handler and is fully preemptible.
It uses local_bh_disable() to remain uninterrupted while checking the
VFP state.
This is not working on PREEMPT_RT because local_bh_disable()
synchronizes the relevant section but the context remains fully
preemptible.

Use vfp_state_hold() for uninterrupted access.

Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
This commit is contained in:
Sebastian Andrzej Siewior 2024-10-02 17:18:11 +01:00 committed by Russell King (Oracle)
parent b54cdbad4a
commit 27035c23ba
1 changed files with 3 additions and 3 deletions
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6
arch/arm/vfp/vfpmodule.c
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@ -708,7 +708,7 @@ static int vfp_support_entry(struct pt_regs *regs, u32 trigger)
if (!user_mode(regs))
return vfp_kmode_exception(regs, trigger);
local_bh_disable();
vfp_state_hold();
fpexc = fmrx(FPEXC);
/*
@ -787,7 +787,7 @@ static int vfp_support_entry(struct pt_regs *regs, u32 trigger)
if (!(fpscr & FPSCR_IXE)) {
if (!(fpscr & FPSCR_LENGTH_MASK)) {
pr_debug("not VFP\n");
local_bh_enable();
vfp_state_release();
return -ENOEXEC;
}
fpexc |= FPEXC_DEX;
@ -797,7 +797,7 @@ bounce: regs->ARM_pc += 4;
VFP_bounce(trigger, fpexc, regs);
}
local_bh_enable();
vfp_state_release();
return 0;
}