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>

1 files changed, 4 insertions, 3 deletions

diff --git a/drivers/i2c/busses/i2c-designware.c b/drivers/i2c/busses/i2c-designware.c
index da5612b21aff..e8e2212d576e 100644
--- a/drivers/i2c/busses/i2c-designware.c
+++ b/drivers/i2c/busses/i2c-designware.c
@@ -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) {