From: Haren Myneni Date: Mon, 4 Jun 2018 08:33:38 +0000 (+1000) Subject: powerpc/powernv: copy/paste - Mask SO bit in CR X-Git-Tag: v4.18-rc1~108^2~7 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=75743649064ec0cf5ddd69f240ef23af66dde16e;p=thirdparty%2Flinux.git powerpc/powernv: copy/paste - Mask SO bit in CR 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 --- diff --git a/arch/powerpc/platforms/powernv/copy-paste.h b/arch/powerpc/platforms/powernv/copy-paste.h index 3fa62de96d9ca..cb36f9fbcef3e 100644 --- a/arch/powerpc/platforms/powernv/copy-paste.h +++ b/arch/powerpc/platforms/powernv/copy-paste.h @@ -41,5 +41,6 @@ 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; }