From 134e70c22eb0a47dcb30f20859f331344b5018db Mon Sep 17 00:00:00 2001 From: Haren Myneni Date: Mon, 4 Jun 2018 18:33:38 +1000 Subject: [PATCH] powerpc/powernv: copy/paste - Mask SO bit in CR commit 75743649064ec0cf5ddd69f240ef23af66dde16e upstream. NX can set the 3rd bit in CR register for XER[SO] (Summary overflow) which is not related to paste request. The current paste function returns failure for a successful request when this bit is set. So mask this bit and check the proper return status. Fixes: 2392c8c8c045 ("powerpc/powernv/vas: Define copy/paste interfaces") Cc: stable@vger.kernel.org # v4.14+ Signed-off-by: Haren Myneni Signed-off-by: Michael Ellerman Signed-off-by: Greg Kroah-Hartman --- arch/powerpc/platforms/powernv/copy-paste.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/platforms/powernv/copy-paste.h b/arch/powerpc/platforms/powernv/copy-paste.h index c9a5036..e9a6c35 100644 --- a/arch/powerpc/platforms/powernv/copy-paste.h +++ b/arch/powerpc/platforms/powernv/copy-paste.h @@ -42,5 +42,6 @@ static inline int vas_paste(void *paste_address, int offset) : "b" (offset), "b" (paste_address) : "memory", "cr0"); - return (cr >> CR0_SHIFT) & CR0_MASK; + /* We mask with 0xE to ignore SO */ + return (cr >> CR0_SHIFT) & 0xE; } -- 2.7.4