Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Sebastian Ott <sebott@linux.ibm.com>,
        Martin Schwidefsky <schwidefsky@de.ibm.com>
Subject: [PATCH 4.14 054/101] s390/pci: fix sleeping in atomic during hotplug
Date:   Mon,  7 Jan 2019 13:32:42 +0100
Message-Id: <20190107105335.887669133@linuxfoundation.org>
In-Reply-To: <20190107105330.372621917@linuxfoundation.org>
References: <20190107105330.372621917@linuxfoundation.org>
User-Agent: quilt/0.65
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Sebastian Ott <sebott@linux.ibm.com>

commit 98dfd32620e970eb576ebce5ea39d905cb005e72 upstream.

When triggered by pci hotplug (PEC 0x306) clp_get_state is called
with spinlocks held resulting in the following warning:

zpci: n/a: Event 0x306 reconfigured PCI function 0x0
BUG: sleeping function called from invalid context at mm/page_alloc.c:4324
in_atomic(): 1, irqs_disabled(): 0, pid: 98, name: kmcheck
2 locks held by kmcheck/98:

Change the allocation to use GFP_ATOMIC.

Cc: stable@vger.kernel.org # 4.13+
Signed-off-by: Sebastian Ott <sebott@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/s390/pci/pci_clp.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/s390/pci/pci_clp.c
+++ b/arch/s390/pci/pci_clp.c
@@ -437,7 +437,7 @@ int clp_get_state(u32 fid, enum zpci_sta
 	struct clp_state_data sd = {fid, ZPCI_FN_STATE_RESERVED};
 	int rc;
 
-	rrb = clp_alloc_block(GFP_KERNEL);
+	rrb = clp_alloc_block(GFP_ATOMIC);
 	if (!rrb)
 		return -ENOMEM;