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Subject[PATCH v2] USB: host: Use zeroing memory allocator rather than allocator/memset
Date
Use dma_zalloc_coherent for allocating zeroed
memory and remove unnecessary memset function.

Done using Coccinelle.
Generated-by: scripts/coccinelle/api/alloc/kzalloc-simple.cocci
0-day tested with no failures.

Suggested-by: Luis R. Rodriguez <mcgrof@kernel.org>
Signed-off-by: Himanshu Jha <himanshujha199640@gmail.com>
---
v2:
-align argumenst as they were before applying the SmPL rule.

drivers/usb/host/uhci-hcd.c | 7 +++----
drivers/usb/host/xhci-mem.c | 7 ++-----
2 files changed, 5 insertions(+), 9 deletions(-)

diff --git a/drivers/usb/host/uhci-hcd.c b/drivers/usb/host/uhci-hcd.c
index f5c9021..ac53398 100644
--- a/drivers/usb/host/uhci-hcd.c
+++ b/drivers/usb/host/uhci-hcd.c
@@ -600,15 +600,14 @@ static int uhci_start(struct usb_hcd *hcd)
uhci->dentry = dentry;
#endif

- uhci->frame = dma_alloc_coherent(uhci_dev(uhci),
- UHCI_NUMFRAMES * sizeof(*uhci->frame),
- &uhci->frame_dma_handle, GFP_KERNEL);
+ uhci->frame = dma_zalloc_coherent(uhci_dev(uhci),
+ UHCI_NUMFRAMES * sizeof(*uhci->frame),
+ &uhci->frame_dma_handle, GFP_KERNEL);
if (!uhci->frame) {
dev_err(uhci_dev(uhci),
"unable to allocate consistent memory for frame list\n");
goto err_alloc_frame;
}
- memset(uhci->frame, 0, UHCI_NUMFRAMES * sizeof(*uhci->frame));

uhci->frame_cpu = kcalloc(UHCI_NUMFRAMES, sizeof(*uhci->frame_cpu),
GFP_KERNEL);
diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index 554a8a5..332420d 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -1782,14 +1782,11 @@ int xhci_alloc_erst(struct xhci_hcd *xhci,
struct xhci_erst_entry *entry;

size = sizeof(struct xhci_erst_entry) * evt_ring->num_segs;
- erst->entries = dma_alloc_coherent(xhci_to_hcd(xhci)->self.sysdev,
- size,
- &erst->erst_dma_addr,
- flags);
+ erst->entries = dma_zalloc_coherent(xhci_to_hcd(xhci)->self.sysdev,
+ size, &erst->erst_dma_addr, flags);
if (!erst->entries)
return -ENOMEM;

- memset(erst->entries, 0, size);
erst->num_entries = evt_ring->num_segs;

seg = evt_ring->first_seg;
--
2.7.4
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