* Document reason for newline character counting in console_write
* Document reason for disabling IRQ in the system resume operation
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@xxxxxxxxxxxxxx>
Reviewed-by: Matthias Kaehlcke <mka@xxxxxxxxxxxx>
---
drivers/tty/serial/qcom_geni_serial.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c
index a1b3eb0..1652b1f 100644
--- a/drivers/tty/serial/qcom_geni_serial.c
+++ b/drivers/tty/serial/qcom_geni_serial.c
@@ -286,6 +286,10 @@ static void qcom_geni_serial_wr_char(struct uart_port *uport, int ch)
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++;
}
@@ -1103,6 +1107,14 @@ 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;
--
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