From f0535df039e225983506351c943d11ee954e88c9 Mon Sep 17 00:00:00 2001 From: Dmitry Torokhov Date: Mon, 11 Jan 2021 21:40:38 +0100 Subject: [PATCH] i2c: smbus: switch from loops to memcpy MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit When copying memory from one buffer to another, instead of open-coding loops with byte-by-byte copies let's use memcpy() which might be a bit faster and makes intent more clear. Signed-off-by: Dmitry Torokhov Reviewed-by: Luca Ceresoli Acked-by: Uwe Kleine-König Signed-off-by: Wolfram Sang --- drivers/i2c/i2c-core-smbus.c | 15 +++++---------- 1 file changed, 5 insertions(+), 10 deletions(-) diff --git a/drivers/i2c/i2c-core-smbus.c b/drivers/i2c/i2c-core-smbus.c index f5c9787992e9..bf6bfe7c5cfe 100644 --- a/drivers/i2c/i2c-core-smbus.c +++ b/drivers/i2c/i2c-core-smbus.c @@ -398,8 +398,7 @@ static s32 i2c_smbus_xfer_emulated(struct i2c_adapter *adapter, u16 addr, } i2c_smbus_try_get_dmabuf(&msg[0], command); - for (i = 1; i < msg[0].len; i++) - msg[0].buf[i] = data->block[i - 1]; + memcpy(msg[0].buf + 1, data->block, msg[0].len - 1); } break; case I2C_SMBUS_BLOCK_PROC_CALL: @@ -414,8 +413,7 @@ static s32 i2c_smbus_xfer_emulated(struct i2c_adapter *adapter, u16 addr, msg[0].len = data->block[0] + 2; i2c_smbus_try_get_dmabuf(&msg[0], command); - for (i = 1; i < msg[0].len; i++) - msg[0].buf[i] = data->block[i - 1]; + memcpy(msg[0].buf + 1, data->block, msg[0].len - 1); msg[1].flags |= I2C_M_RECV_LEN; msg[1].len = 1; /* block length will be added by @@ -437,8 +435,7 @@ static s32 i2c_smbus_xfer_emulated(struct i2c_adapter *adapter, u16 addr, msg[0].len = data->block[0] + 1; i2c_smbus_try_get_dmabuf(&msg[0], command); - for (i = 1; i <= data->block[0]; i++) - msg[0].buf[i] = data->block[i]; + memcpy(msg[0].buf + 1, data->block + 1, data->block[0]); } break; default: @@ -490,8 +487,7 @@ static s32 i2c_smbus_xfer_emulated(struct i2c_adapter *adapter, u16 addr, data->word = msgbuf1[0] | (msgbuf1[1] << 8); break; case I2C_SMBUS_I2C_BLOCK_DATA: - for (i = 0; i < data->block[0]; i++) - data->block[i + 1] = msg[1].buf[i]; + memcpy(data->block + 1, msg[1].buf, data->block[0]); break; case I2C_SMBUS_BLOCK_DATA: case I2C_SMBUS_BLOCK_PROC_CALL: @@ -502,8 +498,7 @@ static s32 i2c_smbus_xfer_emulated(struct i2c_adapter *adapter, u16 addr, status = -EPROTO; goto cleanup; } - for (i = 0; i < msg[1].buf[0] + 1; i++) - data->block[i] = msg[1].buf[i]; + memcpy(data->block, msg[1].buf, msg[1].buf[0] + 1); break; } -- 2.25.1