Re: [PATCH v2 19/25] tty: serial: samsung_tty: IRQ rework

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On 16/02/2021 03.40, Krzysztof Kozlowski wrote:
On Mon, Feb 15, 2021 at 09:17:07PM +0900, Hector Martin wrote:
* Split out s3c24xx_serial_tx_chars from s3c24xx_serial_tx_irq,
   where only the latter acquires the port lock.

I miss here information why you do all this.

Added an explanation for v3. This is used by a subsequent patch in the series.


* For S3C64xx, return IRQ_NONE if no flag bits were set, so the
   interrupt core can detect IRQ storms. Note that both IRQ handlers
   always return IRQ_HANDLED anyway, so 'or' logic isn't necessary here,
   if either handler ran we are always going to return IRQ_HANDLED.

It looks like separate patch. Your patches should do only one thing at
once. The fact that you have here three bullet points is a warning
sign. This is even more important if you do some refactorings and
cleanups which should not affect functionality. Hiding there changes
which could affect functionality is a no-go.

I've reverted this one. I don't think it should affect functionality, but I don't have any way to test on these devices, so I'll leave it to someone else to be safe :)


* Rename s3c24xx_serial_rx_chars to s3c24xx_serial_rx_irq for
   consistency with the above. All it does now is call two other
   functions anyway.

Separate patch for trivial renaming.

I think it makes sense to do this rename together with the first change above, as it keeps both functions symmetric. Otherwise we end up with an inconsistent function naming between both patches. If you really want it separate though, I can do that.



Signed-off-by: Hector Martin <marcan@xxxxxxxxx>
---
  drivers/tty/serial/samsung_tty.c | 41 +++++++++++++++++++-------------
  1 file changed, 24 insertions(+), 17 deletions(-)

diff --git a/drivers/tty/serial/samsung_tty.c b/drivers/tty/serial/samsung_tty.c
index 21955be680a4..821cd0e4f870 100644
--- a/drivers/tty/serial/samsung_tty.c
+++ b/drivers/tty/serial/samsung_tty.c
@@ -151,6 +151,9 @@ struct s3c24xx_uart_port {
  #endif
  };
+static void s3c24xx_serial_start_next_tx(struct s3c24xx_uart_port *ourport);
+static void s3c24xx_serial_tx_chars(struct s3c24xx_uart_port *ourport);
+
  /* conversion functions */
#define s3c24xx_dev_to_port(__dev) dev_get_drvdata(__dev)
@@ -316,8 +319,6 @@ static void s3c24xx_serial_stop_tx(struct uart_port *port)
  	ourport->tx_mode = 0;
  }
-static void s3c24xx_serial_start_next_tx(struct s3c24xx_uart_port *ourport);
-

Why moving this? Why adding s3c24xx_serial_tx_chars() forward
declaration?

This should've gone in the next patch. A previous reviewer told me to put declarations at the top of the file, so I put it there and moved this one along with it, but I'll keep it to the additon only for v3.

--
Hector Martin (marcan@xxxxxxxxx)
Public Key: https://mrcn.st/pub



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