[PATCH 3.12 017/142] vTPM: fix memory allocation flag for rtce buffer at kernel boot

From: Jiri Slaby
Date: Wed Feb 24 2016 - 06:20:52 EST

From: "Hon Ching \\(Vicky\\) Lo" <honclo@xxxxxxxxxxxxxxxxxx>

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


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@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Peter Huewe <peterhuewe@xxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
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 a6524c3efdf7..ce854bbd33ef 100644
--- a/drivers/char/tpm/tpm_ibmvtpm.c
+++ b/drivers/char/tpm/tpm_ibmvtpm.c
@@ -529,7 +529,7 @@ static void ibmvtpm_crq_process(struct ibmvtpm_crq *crq,
ibmvtpm->rtce_size = be16_to_cpu(crq->len);
ibmvtpm->rtce_buf = kmalloc(ibmvtpm->rtce_size,
if (!ibmvtpm->rtce_buf) {
dev_err(ibmvtpm->dev, "Failed to allocate memory for rtce buffer\n");