4.17-stable review patch. If anyone has any objections, please let me know.
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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; }