diff mbox series

[v3,1/5] i2c: nvidia-gpu: refactor master_xfer

Message ID 20190522183142.11061-2-ajayg@nvidia.com
State Awaiting Upstream
Headers show
Series usb: typec: ucsi: ccg: add runtime pm support | expand

Commit Message

Ajay Gupta May 22, 2019, 6:31 p.m. UTC 
From: Ajay Gupta <ajayg@nvidia.com>

Added a local variable "send_stop" to simplify "goto" statements.

The "send_stop" handles below two case
1) When first i2c start fails and so i2c stop is not sent before
exiting

2) When i2c stop failed after all transfers and we do not need to
send another stop before exiting.

Signed-off-by: Ajay Gupta <ajayg@nvidia.com>
---
Changes from v2->v3: None

 drivers/i2c/busses/i2c-nvidia-gpu.c | 27 ++++++++++++++++-----------
 1 file changed, 16 insertions(+), 11 deletions(-)

Comments

Wolfram Sang May 25, 2019, 7:54 p.m. UTC | #1 
On Wed, May 22, 2019 at 11:31:38AM -0700, Ajay Gupta wrote:
> From: Ajay Gupta <ajayg@nvidia.com>
> 
> Added a local variable "send_stop" to simplify "goto" statements.
> 
> The "send_stop" handles below two case
> 1) When first i2c start fails and so i2c stop is not sent before
> exiting
> 
> 2) When i2c stop failed after all transfers and we do not need to
> send another stop before exiting.
> 
> Signed-off-by: Ajay Gupta <ajayg@nvidia.com>

Nice! It was only a brainstorming suggestion to use a dedicated flag.
But I must say I like the outcome; much better readable code IMO.

Suggested-by: Wolfram Sang <wsa@the-dreams.de>
Reviewed-by: Wolfram Sang <wsa@the-dreams.de>
diff mbox series

Patch

diff --git a/drivers/i2c/busses/i2c-nvidia-gpu.c b/drivers/i2c/busses/i2c-nvidia-gpu.c
index 1c8f708f212b..2d9561ec2320 100644
--- a/drivers/i2c/busses/i2c-nvidia-gpu.c
+++ b/drivers/i2c/busses/i2c-nvidia-gpu.c
@@ -169,6 +169,7 @@  static int gpu_i2c_master_xfer(struct i2c_adapter *adap,
 {
 	struct gpu_i2c_dev *i2cd = i2c_get_adapdata(adap);
 	int status, status2;
+	bool send_stop = true;
 	int i, j;
 
 	/*
@@ -182,37 +183,41 @@  static int gpu_i2c_master_xfer(struct i2c_adapter *adap,
 			/* gpu_i2c_read has implicit start */
 			status = gpu_i2c_read(i2cd, msgs[i].buf, msgs[i].len);
 			if (status < 0)
-				goto stop;
+				goto exit;
 		} else {
 			u8 addr = i2c_8bit_addr_from_msg(msgs + i);
 
 			status = gpu_i2c_start(i2cd);
 			if (status < 0) {
 				if (i == 0)
-					return status;
-				goto stop;
+					send_stop = false;
+				goto exit;
 			}
 
 			status = gpu_i2c_write(i2cd, addr);
 			if (status < 0)
-				goto stop;
+				goto exit;
 
 			for (j = 0; j < msgs[i].len; j++) {
 				status = gpu_i2c_write(i2cd, msgs[i].buf[j]);
 				if (status < 0)
-					goto stop;
+					goto exit;
 			}
 		}
 	}
 	status = gpu_i2c_stop(i2cd);
-	if (status < 0)
-		return status;
+	if (status < 0) {
+		send_stop = false;
+		goto exit;
+	}
 
 	return i;
-stop:
-	status2 = gpu_i2c_stop(i2cd);
-	if (status2 < 0)
-		dev_err(i2cd->dev, "i2c stop failed %d\n", status2);
+exit:
+	if (send_stop) {
+		status2 = gpu_i2c_stop(i2cd);
+		if (status2 < 0)
+			dev_err(i2cd->dev, "i2c stop failed %d\n", status2);
+	}
 	return status;
 }