From 13decfb4383b13b0f75e88709f4fad9138bd243b Mon Sep 17 00:00:00 2001 From: Sebastian Ott Date: Mon, 12 Sep 2016 20:09:40 +0200 Subject: misc/genwqe: ensure zero initialization Genwqe uses dma_alloc_coherent and depends on zero initialized memory. On one occasion it ueses an explicit memset on others it uses un-initialized memory. This bug was covered because some archs actually return zero initialized memory when using dma_alloc_coherent but this is by no means guaranteed. Simply switch to dma_zalloc_coherent. Signed-off-by: Sebastian Ott Signed-off-by: Frank Haverkamp Signed-off-by: Greg Kroah-Hartman --- drivers/misc/genwqe/card_ddcb.c | 2 -- drivers/misc/genwqe/card_utils.c | 4 ++-- 2 files changed, 2 insertions(+), 4 deletions(-) diff --git a/drivers/misc/genwqe/card_ddcb.c b/drivers/misc/genwqe/card_ddcb.c index 353ee0cc733d..ddfeefe39540 100644 --- a/drivers/misc/genwqe/card_ddcb.c +++ b/drivers/misc/genwqe/card_ddcb.c @@ -1048,8 +1048,6 @@ static int setup_ddcb_queue(struct genwqe_dev *cd, struct ddcb_queue *queue) "[%s] **err: could not allocate DDCB **\n", __func__); return -ENOMEM; } - memset(queue->ddcb_vaddr, 0, queue_size); - queue->ddcb_req = kzalloc(sizeof(struct ddcb_requ *) * queue->ddcb_max, GFP_KERNEL); if (!queue->ddcb_req) { diff --git a/drivers/misc/genwqe/card_utils.c b/drivers/misc/genwqe/card_utils.c index 222367cc8c81..8a679ecc8fd1 100644 --- a/drivers/misc/genwqe/card_utils.c +++ b/drivers/misc/genwqe/card_utils.c @@ -220,8 +220,8 @@ void *__genwqe_alloc_consistent(struct genwqe_dev *cd, size_t size, if (get_order(size) > MAX_ORDER) return NULL; - return dma_alloc_coherent(&cd->pci_dev->dev, size, dma_handle, - GFP_KERNEL); + return dma_zalloc_coherent(&cd->pci_dev->dev, size, dma_handle, + GFP_KERNEL); } void __genwqe_free_consistent(struct genwqe_dev *cd, size_t size, -- cgit v1.2.3-58-ga151