| From 75743649064ec0cf5ddd69f240ef23af66dde16e Mon Sep 17 00:00:00 2001 |
| From: Haren Myneni <haren@us.ibm.com> |
| Date: Mon, 4 Jun 2018 18:33:38 +1000 |
| Subject: powerpc/powernv: copy/paste - Mask SO bit in CR |
| |
| From: Haren Myneni <haren@us.ibm.com> |
| |
| 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 <haren@us.ibm.com> |
| Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> |
| Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| |
| --- |
| arch/powerpc/platforms/powernv/copy-paste.h | 3 ++- |
| 1 file changed, 2 insertions(+), 1 deletion(-) |
| |
| --- 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_ |
| : "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; |
| } |
