[PATCH RFCv2 4/6] powerpc/powernv: hold device_hotplug_lock when calling device_online()

From: David Hildenbrand <david@redhat.com>
To: linux-mm@kvack.org
Cc: Michael Neuling <mikey@neuling.org>,
	linux-doc@vger.kernel.org,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Balbir Singh <bsingharora@gmail.com>,
	David Hildenbrand <david@redhat.com>,
	linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org,
	Paul Mackerras <paulus@samba.org>,
	Michael Ellerman <mpe@ellerman.id.au>,
	xen-devel@lists.xenproject.org, devel@linuxdriverproject.org,
	Rashmica Gupta <rashmica.g@gmail.com>,
	linuxppc-dev@lists.ozlabs.org
Subject: [PATCH RFCv2 4/6] powerpc/powernv: hold device_hotplug_lock when calling device_online()
Date: Tue, 21 Aug 2018 12:44:16 +0200	[thread overview]
Message-ID: <20180821104418.12710-5-david__42415.0166953497$1534848213$gmane$org@redhat.com> (raw)
In-Reply-To: <20180821104418.12710-1-david@redhat.com>

device_online() should be called with device_hotplug_lock() held.

Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Rashmica Gupta <rashmica.g@gmail.com>
Cc: Balbir Singh <bsingharora@gmail.com>
Cc: Michael Neuling <mikey@neuling.org>
Signed-off-by: David Hildenbrand <david@redhat.com>
---
 arch/powerpc/platforms/powernv/memtrace.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/powerpc/platforms/powernv/memtrace.c b/arch/powerpc/platforms/powernv/memtrace.c
index 8f1cd4f3bfd5..ef7181d4fe68 100644
--- a/arch/powerpc/platforms/powernv/memtrace.c
+++ b/arch/powerpc/platforms/powernv/memtrace.c
@@ -229,9 +229,11 @@ static int memtrace_online(void)
 		 * we need to online the memory ourselves.
 		 */
 		if (!memhp_auto_online) {
+			lock_device_hotplug();
 			walk_memory_range(PFN_DOWN(ent->start),
 					  PFN_UP(ent->start + ent->size - 1),
 					  NULL, online_mem_block);
+			unlock_device_hotplug();
 		}
 
 		/*
-- 
2.17.1


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