linux-kernel - [PATCH] serial:ifx6x60: Remove memset for SPI frame

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Date:	Tue, 22 Jan 2013 16:08:46 +0800
From:	channing <chao.bi@...el.com>
To:	alan@...ux.intel.com, gregkh@...uxfoundation.org
Cc:	jun.d.chen@...el.com, linux-kernel@...r.kernel.org
Subject: [PATCH] serial:ifx6x60: Remove memset for SPI frame


There is no need to memset 0 to SPI frame memory before preparing
transfer frame bits, because SPI frame header are encoded with valid
data size, so don't need to worry about adopting dirty bits, more,
memset zero for each SPI frame may impact the spi throughput efficiency.

Signed-off-by: Chen Jun <jun.d.chen@...el.com>
Signed-off-by: channing <chao.bi@...el.com>
---
 drivers/tty/serial/ifx6x60.c |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)

diff --git a/drivers/tty/serial/ifx6x60.c b/drivers/tty/serial/ifx6x60.c
index 8cb6d8d..fa4ec7e 100644
--- a/drivers/tty/serial/ifx6x60.c
+++ b/drivers/tty/serial/ifx6x60.c
@@ -481,7 +481,6 @@ static int ifx_spi_prepare_tx_buffer(struct ifx_spi_device *ifx_dev)
 	unsigned char *tx_buffer;
 
 	tx_buffer = ifx_dev->tx_buffer;
-	memset(tx_buffer, 0, IFX_SPI_TRANSFER_SIZE);
 
 	/* make room for required SPI header */
 	tx_buffer += IFX_SPI_HEADER_OVERHEAD;
-- 
1.7.1



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