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serial: imx: Add more comments on port lock status

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Comments regarding status of port.lock on internal functions is useful when
reviewing correct handling of registers that must be protected by this
lock.

Signed-off-by: Esben Haabendal <esben@geanix.com>
Link: https://lore.kernel.org/r/20240913-serial-imx-lockfix-v1-2-4d102746c89d@geanix.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Esben Haabendal 2024-09-13 10:39:50 +02:00 committed by Greg Kroah-Hartman
parent 3c199ed5bd
commit 55796b4e37
1 changed files with 10 additions and 0 deletions
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10
drivers/tty/serial/imx.c
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@ -370,6 +370,7 @@ static void imx_uart_soft_reset(struct imx_port *sport)
sport->idle_counter = 0;
}
/* called with port.lock taken and irqs off */
static void imx_uart_disable_loopback_rs485(struct imx_port *sport)
{
unsigned int uts;
@ -470,6 +471,7 @@ static void imx_uart_stop_tx(struct uart_port *port)
}
}
/* called with port.lock taken and irqs off */
static void imx_uart_stop_rx_with_loopback_ctrl(struct uart_port *port, bool loopback)
{
struct imx_port *sport = to_imx_port(port);
@ -803,6 +805,8 @@ static irqreturn_t imx_uart_txint(int irq, void *dev_id)
* issuing soft reset to the UART (just stop/start of RX does not help). Note
* that what we do here is sending isolated start bit about 2.4 times shorter
* than it is to be on UART configured baud rate.
*
* Called with port.lock taken and irqs off.
*/
static void imx_uart_check_flood(struct imx_port *sport, u32 usr2)
{
@ -838,6 +842,7 @@ static void imx_uart_check_flood(struct imx_port *sport, u32 usr2)
}
}
/* called with port.lock taken and irqs off */
static irqreturn_t __imx_uart_rxint(int irq, void *dev_id)
{
struct imx_port *sport = dev_id;
@ -916,6 +921,7 @@ static void imx_uart_clear_rx_errors(struct imx_port *sport);
/*
* We have a modem side uart, so the meanings of RTS and CTS are inverted.
*/
/* called with port.lock taken and irqs off */
static unsigned int imx_uart_get_hwmctrl(struct imx_port *sport)
{
unsigned int tmp = TIOCM_DSR;
@ -938,6 +944,8 @@ static unsigned int imx_uart_get_hwmctrl(struct imx_port *sport)
/*
* Handle any change of modem status signal since we were last called.
*
* Called with port.lock taken and irqs off.
*/
static void imx_uart_mctrl_check(struct imx_port *sport)
{
@ -1277,6 +1285,7 @@ static int imx_uart_start_rx_dma(struct imx_port *sport)
return 0;
}
/* called with port.lock taken and irqs off */
static void imx_uart_clear_rx_errors(struct imx_port *sport)
{
struct tty_port *port = &sport->port.state->port;
@ -1407,6 +1416,7 @@ static int imx_uart_dma_init(struct imx_port *sport)
return ret;
}
/* called with port.lock taken and irqs off */
static void imx_uart_enable_dma(struct imx_port *sport)
{
u32 ucr1;