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>
diff --git a/drivers/i2c/busses/i2c-designware.c b/drivers/i2c/busses/i2c-designware.c
index da5612b..e8e2212 100644
--- a/drivers/i2c/busses/i2c-designware.c
+++ b/drivers/i2c/busses/i2c-designware.c
@@ -364,6 +364,7 @@
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 @@
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 @@
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) {