linux-kernel - [PATCH 4.3 070/125] mwifiex: avoid memsetting PCIe event buffer

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Date:	Mon,  7 Dec 2015 10:01:23 -0500
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Amitkumar Karwar <akarwar@...vell.com>,
	Kalle Valo <kvalo@...eaurora.org>
Subject: [PATCH 4.3 070/125] mwifiex: avoid memsetting PCIe event buffer

4.3-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Amitkumar Karwar <akarwar@...vell.com>

commit 14d9c11c91a606fed65eaae2455423a23bb4ae59 upstream.

Preallocated PCIe buffer is being reused for all PCIe interface
events. Physical address of the buffer is shared with firmware
so that it can perform DMA on it. As event length is specified
in the header, there should not be a problem if the buffer gets
overwritten.
We will save some cycles by avoiding memset everytime while
submitting the buffer to firmware.

Fixes: 2728cecdc7d6bf3d21(mwifiex: corrections in PCIe event skb)
Signed-off-by: Amitkumar Karwar <akarwar@...vell.com>
Signed-off-by: Kalle Valo <kvalo@...eaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/net/wireless/mwifiex/pcie.c |    1 -
 1 file changed, 1 deletion(-)

--- a/drivers/net/wireless/mwifiex/pcie.c
+++ b/drivers/net/wireless/mwifiex/pcie.c
@@ -1815,7 +1815,6 @@ static int mwifiex_pcie_event_complete(s
 	if (!card->evt_buf_list[rdptr]) {
 		skb_push(skb, INTF_HEADER_LEN);
 		skb_put(skb, MAX_EVENT_SIZE - skb->len);
-		memset(skb->data, 0, MAX_EVENT_SIZE);
 		if (mwifiex_map_pci_memory(adapter, skb,
 					   MAX_EVENT_SIZE,
 					   PCI_DMA_FROMDEVICE))


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