| From | Kamal Mostafa <> | Subject | [PATCH 3.13.y-ckt 30/86] vTPM: fix memory allocation flag for rtce buffer at kernel boot | Date | Wed, 2 Dec 2015 14:53:51 -0800 |
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3.13.11-ckt31 -stable review patch. If anyone has any objections, please let me know.
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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: Kamal Mostafa <kamal@canonical.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 3802733..07119a3 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, - GFP_KERNEL); + GFP_ATOMIC); if (!ibmvtpm->rtce_buf) { dev_err(ibmvtpm->dev, "Failed to allocate memory for rtce buffer\n"); return; -- 1.9.1
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