On 30/06/2021 13:11, Thierry Reding wrote:

On Wed, Jun 30, 2021 at 10:46:01AM +0100, Jon Hunter wrote:

...

The Tegra serial driver always prints an error message when enabling the FIFO for devices that have support for checking the FIFO enable status. Fix this by only display the error message, when an error occurs.

Fixes: 222dcdff3405 ("serial: tegra: check for FIFO mode enabled status") Cc: stable@vger.kernel.org Signed-off-by: Jon Hunter jonathanh@nvidia.com

---

drivers/tty/serial/serial-tegra.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/tty/serial/serial-tegra.c b/drivers/tty/serial/serial-tegra.c index 222032792d6c..cd481f7ba8eb 100644 --- a/drivers/tty/serial/serial-tegra.c +++ b/drivers/tty/serial/serial-tegra.c @@ -1045,9 +1045,10 @@ static int tegra_uart_hw_init(struct tegra_uart_port *tup) if (tup->cdata->fifo_mode_enable_status) { ret = tegra_uart_wait_fifo_mode_enabled(tup);

• dev_err(tup->uport.dev, "FIFO mode not enabled\n");
  

• if (ret < 0)
  

• if (ret < 0) {
  

• 	dev_err(tup->uport.dev, "FIFO mode not enabled\n");
  

The error message seems a bit confusing. I read this as meaning "FIFO mode was expected to be enabled but wasn't" whereas this really seems to mean that for some reason the FIFO enable timed out.

In the former case it sounds like a some configuration mismatch, while it's really something that went wrong during the process of enabling the FIFO mode.

So I wonder if this should perhaps be something like:

dev_err(tup->uport.dev, "FIFO mode enable timed out\n");

or something along those lines.

Yes good point. Maybe I should just ...

dev_err(tup->uport.dev, "Failed to enable FIFO mode: %d\n", ret);

Then if it is updated to ever return anything other that -ETIMEDOUT we are covered. I will send a V2.

Jon