linux-kernel - [PATCH 3.16.y-ckt 032/126] vTPM: fix memory allocation flag for rtce buffer at kernel boot

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Date:	Wed,  9 Dec 2015 09:36:42 +0000
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	"Hon Ching(Vicky) Lo" <honclo@...ux.vnet.ibm.com>,
	Peter Huewe <peterhuewe@....de>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 032/126] vTPM: fix memory allocation flag for rtce buffer at kernel boot

3.16.7-ckt21 -stable review patch.  If anyone has any objections, please let me know.

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

From: "Hon Ching \\\\(Vicky\\\\) Lo" <honclo@...ux.vnet.ibm.com>

commit 60ecd86c4d985750efa0ea3d8610972b09951715 upstream.

At ibm vtpm initialzation, tpm_ibmvtpm_probe() registers its interrupt
handler, ibmvtpm_interrupt, which calls ibmvtpm_crq_process to allocate
memory for rtce buffer.  The current code uses 'GFP_KERNEL' as the
type of kernel memory allocation, which resulted a warning at
kernel/lockdep.c.  This patch uses 'GFP_ATOMIC' instead so that the
allocation is high-priority and does not sleep.

Signed-off-by: Hon Ching(Vicky) Lo <honclo@...ux.vnet.ibm.com>
Signed-off-by: Peter Huewe <peterhuewe@....de>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 drivers/char/tpm/tpm_ibmvtpm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/char/tpm/tpm_ibmvtpm.c b/drivers/char/tpm/tpm_ibmvtpm.c
index 643bba7d6f81..9eab751efeea 100644
--- a/drivers/char/tpm/tpm_ibmvtpm.c
+++ b/drivers/char/tpm/tpm_ibmvtpm.c
@@ -490,7 +490,7 @@ static void ibmvtpm_crq_process(struct ibmvtpm_crq *crq,
 			}
 			ibmvtpm->rtce_size = be16_to_cpu(crq->len);
 			ibmvtpm->rtce_buf = kmalloc(ibmvtpm->rtce_size,
-						    GFP_KERNEL);
+						    GFP_ATOMIC);
 			if (!ibmvtpm->rtce_buf) {
 				dev_err(ibmvtpm->dev, "Failed to allocate memory for rtce buffer\n");
 				return;
--
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