linux-kernel - [RFC 1/2] powerpc/fsl-pci: atomic get_user when pagefault

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Date:	Tue, 25 Nov 2014 12:43:25 +0100
From:	David Hildenbrand <dahi@...ux.vnet.ibm.com>
To:	linuxppc-dev@...ts.ozlabs.org, linux-arch@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc:	benh@...nel.crashing.org, paulus@...ba.org,
	akpm@...ux-foundation.org, heiko.carstens@...ibm.com,
	dahi@...ux.vnet.ibm.com, schwidefsky@...ibm.com,
	borntraeger@...ibm.com
Subject: [RFC 1/2] powerpc/fsl-pci: atomic get_user when pagefault_disabled

Whenever we have pagefaults disabled, we have to use the atomic variants of
(set|get)_user and copy_(from|to)_user.

Signed-off-by: David Hildenbrand <dahi@...ux.vnet.ibm.com>
---
 arch/powerpc/sysdev/fsl_pci.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/sysdev/fsl_pci.c b/arch/powerpc/sysdev/fsl_pci.c
index 65d2ed4..c0af4ef 100644
--- a/arch/powerpc/sysdev/fsl_pci.c
+++ b/arch/powerpc/sysdev/fsl_pci.c
@@ -1025,7 +1025,7 @@ int fsl_pci_mcheck_exception(struct pt_regs *regs)
 	if (is_in_pci_mem_space(addr)) {
 		if (user_mode(regs)) {
 			pagefault_disable();
-			ret = get_user(regs->nip, &inst);
+			ret = __get_user_inatomic(regs->nip, &inst);
 			pagefault_enable();
 		} else {
 			ret = probe_kernel_address(regs->nip, inst);
-- 
1.8.5.5

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