linux-kernel - [PATCH v2 09/27] ocxl: Free detached contexts in ocxl_context_detach

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Message-Id: <20191203034655.51561-10-alastair@au1.ibm.com>
Date:   Tue,  3 Dec 2019 14:46:37 +1100
From:   "Alastair D'Silva" <alastair@....ibm.com>
To:     alastair@...ilva.org
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Frederic Barrat <fbarrat@...ux.ibm.com>,
        Andrew Donnellan <ajd@...ux.ibm.com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Keith Busch <keith.busch@...el.com>,
        Ira Weiny <ira.weiny@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Rob Herring <robh@...nel.org>,
        Anton Blanchard <anton@...abs.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Mahesh Salgaonkar <mahesh@...ux.vnet.ibm.com>,
        Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>,
        Cédric Le Goater <clg@...d.org>,
        Anju T Sudhakar <anju@...ux.vnet.ibm.com>,
        Hari Bathini <hbathini@...ux.ibm.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Greg Kurz <groug@...d.org>,
        Nicholas Piggin <npiggin@...il.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Alexey Kardashevskiy <aik@...abs.ru>,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-nvdimm@...ts.01.org, linux-mm@...ck.org
Subject: [PATCH v2 09/27] ocxl: Free detached contexts in ocxl_context_detach_all()

From: Alastair D'Silva <alastair@...ilva.org>

ocxl_context_detach_all() is called from ocxl_function_close(), so
there is no reason to leave the contexts allocated, as the caller
can do nothing useful with them at that point.

This also has the side-effect of freeing any allocated IRQs
within the context.

Signed-off-by: Alastair D'Silva <alastair@...ilva.org>
---
 drivers/misc/ocxl/context.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/misc/ocxl/context.c b/drivers/misc/ocxl/context.c
index 994563a078eb..6cb36ef96e09 100644
--- a/drivers/misc/ocxl/context.c
+++ b/drivers/misc/ocxl/context.c
@@ -259,10 +259,11 @@ void ocxl_context_detach_all(struct ocxl_afu *afu)
 {
 	struct ocxl_context *ctx;
 	int tmp;
+	int rc;
 
 	mutex_lock(&afu->contexts_lock);
 	idr_for_each_entry(&afu->contexts_idr, ctx, tmp) {
-		ocxl_context_detach(ctx);
+		rc = ocxl_context_detach(ctx);
 		/*
 		 * We are force detaching - remove any active mmio
 		 * mappings so userspace cannot interfere with the
@@ -274,6 +275,9 @@ void ocxl_context_detach_all(struct ocxl_afu *afu)
 		if (ctx->mapping)
 			unmap_mapping_range(ctx->mapping, 0, 0, 1);
 		mutex_unlock(&ctx->mapping_lock);
+
+		if (rc != -EBUSY)
+			ocxl_context_free(ctx);
 	}
 	mutex_unlock(&afu->contexts_lock);
 }
-- 
2.23.0