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 <seb...@linux.vnet.ibm.com> --- 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 353ee0c..ddfeefe 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 222367c..8a679ec 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, -- 2.5.5