linux-kernel - [PATCH 4/7] CXL: Early return from cxl_handle

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Date:	Mon,  8 Dec 2014 19:17:58 +1100
From:	"Ian Munsie" <imunsie@....ibm.com>
To:	mpe <mpe@...erman.id.au>
Cc:	greg <greg@...ah.com>, arnd <arnd@...db.de>,
	benh <benh@...nel.crashing.org>, mikey <mikey@...ling.org>,
	anton <anton@...ba.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linuxppc-dev <linuxppc-dev@...abs.org>, jk <jk@...abs.org>,
	imunsie <imunsie@....ibm.com>,
	cbe-oss-dev <cbe-oss-dev@...ts.ozlabs.org>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Subject: [PATCH 4/7] CXL: Early return from cxl_handle_fault for a shut down context

From: Ian Munsie <imunsie@....ibm.com>

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@....ibm.com>
---
 drivers/misc/cxl/fault.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/misc/cxl/fault.c b/drivers/misc/cxl/fault.c
index c99e896..3e8c06a 100644
--- a/drivers/misc/cxl/fault.c
+++ b/drivers/misc/cxl/fault.c
@@ -176,6 +176,12 @@ 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);
 
-- 
2.1.3

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