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tty: serial: qcom_geni_serial: Add comments for clarification

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* Document reason for newline character counting in console_write
* Document reason for disabling IRQ in the system resume operation

Signed-off-by: Karthikeyan Ramasubramanian <[email protected]>
Reviewed-by: Matthias Kaehlcke <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Karthikeyan Ramasubramanian 2018-05-03 14:14:33 -06:00 • committed by Greg Kroah-Hartman
commit f02625689e
1 changed files with 12 additions and 0 deletions
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12
drivers/tty/serial/qcom_geni_serial.c
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@ -286,6 +286,10 @@ __qcom_geni_serial_console_write(struct uart_port *uport, const char *s,
u32 bytes_to_send = count;
for (i = 0; i < count; i++) {
/*
* uart_console_write() adds a carriage return for each newline.
* Account for additional bytes to be written.
*/
if (s[i] == '\n')
bytes_to_send++;
}
@ -1101,6 +1105,14 @@ static int __maybe_unused qcom_geni_serial_sys_resume_noirq(struct device *dev)
if (console_suspend_enabled && uport->suspended) {
uart_resume_port(uport->private_data, uport);
/*
* uart_suspend_port() invokes port shutdown which in turn
* frees the irq. uart_resume_port invokes port startup which
* performs request_irq. The request_irq auto-enables the IRQ.
* In addition, resume_noirq implicitly enables the IRQ and
* leads to an unbalanced IRQ enable warning. Disable the IRQ
* before returning so that the warning is suppressed.
*/
disable_irq(uport->irq);
}
return 0;