linux-kernel - [PATCH 46/87] usb: host: remove memset after dma_alloc

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Message-Id: <20190627174121.4399-1-huangfq.daxian@gmail.com>
Date:   Fri, 28 Jun 2019 01:41:20 +0800
From:   Fuqian Huang <huangfq.daxian@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Fuqian Huang <huangfq.daxian@...il.com>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 46/87] usb: host: remove memset after dma_alloc_coherent in xhci

In commit af7ddd8a627c
("Merge tag 'dma-mapping-4.21' of git://git.infradead.org/users/hch/dma-mapping"),
dma_alloc_coherent has already zeroed the memory.
So memset is not needed.

Signed-off-by: Fuqian Huang <huangfq.daxian@...il.com>
---
 drivers/usb/host/xhci-dbgcap.c | 1 -
 drivers/usb/host/xhci-mem.c    | 1 -
 2 files changed, 2 deletions(-)

diff --git a/drivers/usb/host/xhci-dbgcap.c b/drivers/usb/host/xhci-dbgcap.c
index 52e32644a4b2..93e2cca5262d 100644
--- a/drivers/usb/host/xhci-dbgcap.c
+++ b/drivers/usb/host/xhci-dbgcap.c
@@ -22,7 +22,6 @@ dbc_dma_alloc_coherent(struct xhci_hcd *xhci, size_t size,
 
 	vaddr = dma_alloc_coherent(xhci_to_hcd(xhci)->self.sysdev,
 				   size, dma_handle, flags);
-	memset(vaddr, 0, size);
 	return vaddr;
 }
 
diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index cf5e17962179..e16eda6e2b8b 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -2399,7 +2399,6 @@ int xhci_mem_init(struct xhci_hcd *xhci, gfp_t flags)
 			flags);
 	if (!xhci->dcbaa)
 		goto fail;
-	memset(xhci->dcbaa, 0, sizeof *(xhci->dcbaa));
 	xhci->dcbaa->dma = dma;
 	xhci_dbg_trace(xhci, trace_xhci_dbg_init,
 			"// Device context base array address = 0x%llx (DMA), %p (virt)",
-- 
2.11.0