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Subject[PATCH 3.10 16/64] vTPM: fix memory allocation flag for rtce buffer at kernel boot
Date
3.10-stable review patch.  If anyone has any objections, please let me know.

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

From: Hon Ching \(Vicky\) Lo <honclo@linux.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@linux.vnet.ibm.com>
Signed-off-by: Peter Huewe <peterhuewe@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/char/tpm/tpm_ibmvtpm.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/char/tpm/tpm_ibmvtpm.c
+++ b/drivers/char/tpm/tpm_ibmvtpm.c
@@ -529,7 +529,7 @@ static void ibmvtpm_crq_process(struct i
}
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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