linux-kernel - [PATCH] vTPM: fix memory allocation flag for rtce buffer at kernel boot

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Message-Id: <1444263114-15081-1-git-send-email-honclo@linux.vnet.ibm.com>
Date:	Wed,  7 Oct 2015 20:11:51 -0400
From:	"Hon Ching(Vicky) Lo" <honclo@...ux.vnet.ibm.com>
To:	tpmdd-devel@...ts.sourceforge.net
Cc:	Peter Huewe <PeterHuewe@....de>, Ashley Lai <ashley@...leylai.com>,
	Mimi Zohar <zohar@...ux.vnet.ibm.com>,
	Vicky Lo <honclo2014@...il.com>, linux-kernel@...r.kernel.org,
	"Hon Ching(Vicky) Lo" <honclo@...ux.vnet.ibm.com>
Subject: [PATCH] vTPM: fix memory allocation flag for rtce buffer at kernel boot

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>
---
 drivers/char/tpm/tpm_ibmvtpm.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/char/tpm/tpm_ibmvtpm.c b/drivers/char/tpm/tpm_ibmvtpm.c
index 27ebf95..3e6a226 100644
--- a/drivers/char/tpm/tpm_ibmvtpm.c
+++ b/drivers/char/tpm/tpm_ibmvtpm.c
@@ -491,7 +491,7 @@ 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;
-- 
1.7.1

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