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i2c-designware: i2c_dw_xfer_msg: Introduce a local "buf" pointer 

While we have a local variable "buf_len" for dev->tx_buf_len, we don't
have such local variable for dev->tx_buf pointer.  While "buf_len" is
restored at first then updated when we start processing a new i2c_msg
(determined by STATUS_WRITE_IN_PROGRESS flag), ->tx_buf is different.

Such inconsistency makes the code slightly hard to follow.

Signed-off-by: Shinya Kuribayashi <shinya.kuribayashi@necel.com>
Acked-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
This commit is contained in:
Shinya Kuribayashi 2009-11-06 21:49:14 +09:00 committed by Ben Dooks
parent 81e798b73a
commit 26ea15b1f5
1 changed files with 4 additions and 3 deletions
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7
drivers/i2c/busses/i2c-designware.c
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@ -364,6 +364,7 @@ i2c_dw_xfer_msg(struct dw_i2c_dev *dev)
int rx_limit = dev->rx_fifo_depth - readl(dev->base + DW_IC_RXFLR);
u32 addr = msgs[dev->msg_write_idx].addr;
u32 buf_len = dev->tx_buf_len;
u8 *buf = dev->tx_buf;;
intr_mask = DW_IC_INTR_STOP_DET | DW_IC_INTR_TX_ABRT | DW_IC_INTR_RX_FULL;
@ -384,7 +385,7 @@ i2c_dw_xfer_msg(struct dw_i2c_dev *dev)
if (!(dev->status & STATUS_WRITE_IN_PROGRESS)) {
/* new i2c_msg */
dev->tx_buf = msgs[dev->msg_write_idx].buf;
buf = msgs[dev->msg_write_idx].buf;
buf_len = msgs[dev->msg_write_idx].len;
}
@ -393,11 +394,11 @@ i2c_dw_xfer_msg(struct dw_i2c_dev *dev)
writel(0x100, dev->base + DW_IC_DATA_CMD);
rx_limit--;
} else
writel(*(dev->tx_buf++),
dev->base + DW_IC_DATA_CMD);
writel(*buf++, dev->base + DW_IC_DATA_CMD);
tx_limit--; buf_len--;
}
dev->tx_buf = buf;
dev->tx_buf_len = buf_len;
if (buf_len > 0) {