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misc/genwqe: ensure zero initialization

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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 <sebott@linux.vnet.ibm.com>
Signed-off-by: Frank Haverkamp <haver@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sebastian Ott 2016-09-12 20:09:40 +02:00 committed by Greg Kroah-Hartman
parent db08948b97
commit 13decfb438
2 changed files with 2 additions and 4 deletions
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2
drivers/misc/genwqe/card_ddcb.c
View File

@ -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) {

4
drivers/misc/genwqe/card_utils.c
View File

@ -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,