cxl: Early return from cxl_handle_fault for a shut down context

If a context is being detached and we get a translation fault for it
there is little point getting it's mm and handling the fault, so just
respond with an address error and return earlier.

Signed-off-by: Ian Munsie <imunsie@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/misc/cxl/fault.c b/drivers/misc/cxl/fault.c
index f8684bca2d79..e010302a192b 100644
--- a/drivers/misc/cxl/fault.c
+++ b/drivers/misc/cxl/fault.c
@@ -180,6 +180,12 @@ void cxl_handle_fault(struct work_struct *fault_work)
                 return;
         }
 
+        /* Early return if the context is being / has been detached */
+        if (ctx->status == CLOSED) {
+                cxl_ack_ae(ctx);
+                return;
+        }
+
         pr_devel("CXL BOTTOM HALF handling fault for afu pe: %i. "
                 "DSISR: %#llx DAR: %#llx\n", ctx->pe, dsisr, dar);