Commit 60ecd86c authored Oct 07, 2015 by $Hon Ching $Vicky$ Lo's avatar$ Hon Ching $Vicky$ Lo Committed by Peter Huewe Oct 19, 2015

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.

Cc: stable@kernel.org
Signed-off-by: Hon Ching(Vicky) Lo <honclo@linux.vnet.ibm.com>
Signed-off-by: Peter Huewe <peterhuewe@gmx.de>

parent eb630116

drivers/char/tpm/tpm_ibmvtpm.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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;