Merge tag 'tty-5.1-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty
Pull tty/serial fixes from Greg KH:
"Here are some small tty and serial driver fixes for 5.1-rc3.
Nothing major here, just a number of potential problems fixes for
error handling paths, as well as some other minor bugfixes for
reported issues with 5.1-rc1.
All of these have been in linux-next with no reported issues"
* tag 'tty-5.1-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty:
tty: fix NULL pointer issue when tty_port ops is not set
Disable kgdboc failed by echo space to /sys/module/kgdboc/parameters/kgdboc
dt-bindings: serial: Add compatible for Mediatek MT8183
tty/serial: atmel: RS485 HD w/DMA: enable RX after TX is stopped
tty/serial: atmel: Add is_half_duplex helper
serial: sh-sci: Fix setting SCSCR_TIE while transferring data
serial: ar933x_uart: Fix build failure with disabled console
tty: serial: qcom_geni_serial: Initialize baud in qcom_geni_console_setup
sc16is7xx: missing unregister/delete driver on error in sc16is7xx_init()
tty: mxs-auart: fix a potential NULL pointer dereference
tty: atmel_serial: fix a potential NULL pointer dereference
serial: max310x: Fix to avoid potential NULL pointer dereference
serial: mvebu-uart: Fix to avoid a potential NULL pointer dereference
diff --git a/Documentation/devicetree/bindings/serial/mtk-uart.txt b/Documentation/devicetree/bindings/serial/mtk-uart.txt
index 742cb47..bcfb131 100644
--- a/Documentation/devicetree/bindings/serial/mtk-uart.txt
+++ b/Documentation/devicetree/bindings/serial/mtk-uart.txt
@@ -16,6 +16,7 @@
* "mediatek,mt8127-uart" for MT8127 compatible UARTS
* "mediatek,mt8135-uart" for MT8135 compatible UARTS
* "mediatek,mt8173-uart" for MT8173 compatible UARTS
+ * "mediatek,mt8183-uart", "mediatek,mt6577-uart" for MT8183 compatible UARTS
* "mediatek,mt6577-uart" for MT6577 and all of the above
- reg: The base address of the UART register bank.
diff --git a/drivers/tty/serial/ar933x_uart.c b/drivers/tty/serial/ar933x_uart.c
index db5df3d..3bdd56a 100644
--- a/drivers/tty/serial/ar933x_uart.c
+++ b/drivers/tty/serial/ar933x_uart.c
@@ -49,11 +49,6 @@
struct clk *clk;
};
-static inline bool ar933x_uart_console_enabled(void)
-{
- return IS_ENABLED(CONFIG_SERIAL_AR933X_CONSOLE);
-}
-
static inline unsigned int ar933x_uart_read(struct ar933x_uart_port *up,
int offset)
{
@@ -508,6 +503,7 @@
.verify_port = ar933x_uart_verify_port,
};
+#ifdef CONFIG_SERIAL_AR933X_CONSOLE
static struct ar933x_uart_port *
ar933x_console_ports[CONFIG_SERIAL_AR933X_NR_UARTS];
@@ -604,14 +600,7 @@
.index = -1,
.data = &ar933x_uart_driver,
};
-
-static void ar933x_uart_add_console_port(struct ar933x_uart_port *up)
-{
- if (!ar933x_uart_console_enabled())
- return;
-
- ar933x_console_ports[up->port.line] = up;
-}
+#endif /* CONFIG_SERIAL_AR933X_CONSOLE */
static struct uart_driver ar933x_uart_driver = {
.owner = THIS_MODULE,
@@ -700,7 +689,9 @@
baud = ar933x_uart_get_baud(port->uartclk, 0, AR933X_UART_MAX_STEP);
up->max_baud = min_t(unsigned int, baud, AR933X_UART_MAX_BAUD);
- ar933x_uart_add_console_port(up);
+#ifdef CONFIG_SERIAL_AR933X_CONSOLE
+ ar933x_console_ports[up->port.line] = up;
+#endif
ret = uart_add_one_port(&ar933x_uart_driver, &up->port);
if (ret)
@@ -749,8 +740,9 @@
{
int ret;
- if (ar933x_uart_console_enabled())
- ar933x_uart_driver.cons = &ar933x_uart_console;
+#ifdef CONFIG_SERIAL_AR933X_CONSOLE
+ ar933x_uart_driver.cons = &ar933x_uart_console;
+#endif
ret = uart_register_driver(&ar933x_uart_driver);
if (ret)
diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
index 05147fe..0b4f369 100644
--- a/drivers/tty/serial/atmel_serial.c
+++ b/drivers/tty/serial/atmel_serial.c
@@ -166,6 +166,8 @@
unsigned int pending_status;
spinlock_t lock_suspended;
+ bool hd_start_rx; /* can start RX during half-duplex operation */
+
/* ISO7816 */
unsigned int fidi_min;
unsigned int fidi_max;
@@ -231,6 +233,13 @@
__raw_writeb(value, port->membase + ATMEL_US_THR);
}
+static inline int atmel_uart_is_half_duplex(struct uart_port *port)
+{
+ return ((port->rs485.flags & SER_RS485_ENABLED) &&
+ !(port->rs485.flags & SER_RS485_RX_DURING_TX)) ||
+ (port->iso7816.flags & SER_ISO7816_ENABLED);
+}
+
#ifdef CONFIG_SERIAL_ATMEL_PDC
static bool atmel_use_pdc_rx(struct uart_port *port)
{
@@ -608,10 +617,9 @@
/* Disable interrupts */
atmel_uart_writel(port, ATMEL_US_IDR, atmel_port->tx_done_mask);
- if (((port->rs485.flags & SER_RS485_ENABLED) &&
- !(port->rs485.flags & SER_RS485_RX_DURING_TX)) ||
- port->iso7816.flags & SER_ISO7816_ENABLED)
+ if (atmel_uart_is_half_duplex(port))
atmel_start_rx(port);
+
}
/*
@@ -628,9 +636,7 @@
return;
if (atmel_use_pdc_tx(port) || atmel_use_dma_tx(port))
- if (((port->rs485.flags & SER_RS485_ENABLED) &&
- !(port->rs485.flags & SER_RS485_RX_DURING_TX)) ||
- port->iso7816.flags & SER_ISO7816_ENABLED)
+ if (atmel_uart_is_half_duplex(port))
atmel_stop_rx(port);
if (atmel_use_pdc_tx(port))
@@ -928,11 +934,14 @@
*/
if (!uart_circ_empty(xmit))
atmel_tasklet_schedule(atmel_port, &atmel_port->tasklet_tx);
- else if (((port->rs485.flags & SER_RS485_ENABLED) &&
- !(port->rs485.flags & SER_RS485_RX_DURING_TX)) ||
- port->iso7816.flags & SER_ISO7816_ENABLED) {
- /* DMA done, stop TX, start RX for RS485 */
- atmel_start_rx(port);
+ else if (atmel_uart_is_half_duplex(port)) {
+ /*
+ * DMA done, re-enable TXEMPTY and signal that we can stop
+ * TX and start RX for RS485
+ */
+ atmel_port->hd_start_rx = true;
+ atmel_uart_writel(port, ATMEL_US_IER,
+ atmel_port->tx_done_mask);
}
spin_unlock_irqrestore(&port->lock, flags);
@@ -1288,6 +1297,10 @@
sg_dma_len(&atmel_port->sg_rx)/2,
DMA_DEV_TO_MEM,
DMA_PREP_INTERRUPT);
+ if (!desc) {
+ dev_err(port->dev, "Preparing DMA cyclic failed\n");
+ goto chan_err;
+ }
desc->callback = atmel_complete_rx_dma;
desc->callback_param = port;
atmel_port->desc_rx = desc;
@@ -1376,9 +1389,20 @@
struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
if (pending & atmel_port->tx_done_mask) {
- /* Either PDC or interrupt transmission */
atmel_uart_writel(port, ATMEL_US_IDR,
atmel_port->tx_done_mask);
+
+ /* Start RX if flag was set and FIFO is empty */
+ if (atmel_port->hd_start_rx) {
+ if (!(atmel_uart_readl(port, ATMEL_US_CSR)
+ & ATMEL_US_TXEMPTY))
+ dev_warn(port->dev, "Should start RX, but TX fifo is not empty\n");
+
+ atmel_port->hd_start_rx = false;
+ atmel_start_rx(port);
+ return;
+ }
+
atmel_tasklet_schedule(atmel_port, &atmel_port->tasklet_tx);
}
}
@@ -1508,9 +1532,7 @@
atmel_uart_writel(port, ATMEL_US_IER,
atmel_port->tx_done_mask);
} else {
- if (((port->rs485.flags & SER_RS485_ENABLED) &&
- !(port->rs485.flags & SER_RS485_RX_DURING_TX)) ||
- port->iso7816.flags & SER_ISO7816_ENABLED) {
+ if (atmel_uart_is_half_duplex(port)) {
/* DMA done, stop TX, start RX for RS485 */
atmel_start_rx(port);
}
diff --git a/drivers/tty/serial/kgdboc.c b/drivers/tty/serial/kgdboc.c
index 6fb312e..bfe5e9e 100644
--- a/drivers/tty/serial/kgdboc.c
+++ b/drivers/tty/serial/kgdboc.c
@@ -148,8 +148,10 @@
char *cptr = config;
struct console *cons;
- if (!strlen(config) || isspace(config[0]))
+ if (!strlen(config) || isspace(config[0])) {
+ err = 0;
goto noconfig;
+ }
kgdboc_io_ops.is_console = 0;
kgdb_tty_driver = NULL;
diff --git a/drivers/tty/serial/max310x.c b/drivers/tty/serial/max310x.c
index f5bdde4..450ba6d 100644
--- a/drivers/tty/serial/max310x.c
+++ b/drivers/tty/serial/max310x.c
@@ -1415,6 +1415,8 @@
if (spi->dev.of_node) {
const struct of_device_id *of_id =
of_match_device(max310x_dt_ids, &spi->dev);
+ if (!of_id)
+ return -ENODEV;
devtype = (struct max310x_devtype *)of_id->data;
} else {
diff --git a/drivers/tty/serial/mvebu-uart.c b/drivers/tty/serial/mvebu-uart.c
index 231f751..7e7b1559 100644
--- a/drivers/tty/serial/mvebu-uart.c
+++ b/drivers/tty/serial/mvebu-uart.c
@@ -810,6 +810,9 @@
return -EINVAL;
}
+ if (!match)
+ return -ENODEV;
+
/* Assume that all UART ports have a DT alias or none has */
id = of_alias_get_id(pdev->dev.of_node, "serial");
if (!pdev->dev.of_node || id < 0)
diff --git a/drivers/tty/serial/mxs-auart.c b/drivers/tty/serial/mxs-auart.c
index 27235a5..4c188f4 100644
--- a/drivers/tty/serial/mxs-auart.c
+++ b/drivers/tty/serial/mxs-auart.c
@@ -1686,6 +1686,10 @@
s->port.mapbase = r->start;
s->port.membase = ioremap(r->start, resource_size(r));
+ if (!s->port.membase) {
+ ret = -ENOMEM;
+ goto out_disable_clks;
+ }
s->port.ops = &mxs_auart_ops;
s->port.iotype = UPIO_MEM;
s->port.fifosize = MXS_AUART_FIFO_SIZE;
diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c
index 3bcec1c..35e5f9c 100644
--- a/drivers/tty/serial/qcom_geni_serial.c
+++ b/drivers/tty/serial/qcom_geni_serial.c
@@ -1050,7 +1050,7 @@
{
struct uart_port *uport;
struct qcom_geni_serial_port *port;
- int baud;
+ int baud = 9600;
int bits = 8;
int parity = 'n';
int flow = 'n';
diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c
index 635178c..09a183d 100644
--- a/drivers/tty/serial/sc16is7xx.c
+++ b/drivers/tty/serial/sc16is7xx.c
@@ -1507,7 +1507,7 @@
ret = i2c_add_driver(&sc16is7xx_i2c_uart_driver);
if (ret < 0) {
pr_err("failed to init sc16is7xx i2c --> %d\n", ret);
- return ret;
+ goto err_i2c;
}
#endif
@@ -1515,10 +1515,18 @@
ret = spi_register_driver(&sc16is7xx_spi_uart_driver);
if (ret < 0) {
pr_err("failed to init sc16is7xx spi --> %d\n", ret);
- return ret;
+ goto err_spi;
}
#endif
return ret;
+
+err_spi:
+#ifdef CONFIG_SERIAL_SC16IS7XX_I2C
+ i2c_del_driver(&sc16is7xx_i2c_uart_driver);
+#endif
+err_i2c:
+ uart_unregister_driver(&sc16is7xx_uart);
+ return ret;
}
module_init(sc16is7xx_init);
diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index 060fcd4..2d1c626 100644
--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -838,19 +838,9 @@
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
uart_write_wakeup(port);
- if (uart_circ_empty(xmit)) {
+ if (uart_circ_empty(xmit))
sci_stop_tx(port);
- } else {
- ctrl = serial_port_in(port, SCSCR);
- if (port->type != PORT_SCI) {
- serial_port_in(port, SCxSR); /* Dummy read */
- sci_clear_SCxSR(port, SCxSR_TDxE_CLEAR(port));
- }
-
- ctrl |= SCSCR_TIE;
- serial_port_out(port, SCSCR, ctrl);
- }
}
/* On SH3, SCIF may read end-of-break as a space->mark char */
diff --git a/drivers/tty/tty_port.c b/drivers/tty/tty_port.c
index 044c3cb..a9e12b3 100644
--- a/drivers/tty/tty_port.c
+++ b/drivers/tty/tty_port.c
@@ -325,7 +325,7 @@
if (tty && C_HUPCL(tty))
tty_port_lower_dtr_rts(port);
- if (port->ops->shutdown)
+ if (port->ops && port->ops->shutdown)
port->ops->shutdown(port);
}
out:
@@ -398,7 +398,7 @@
*/
int tty_port_carrier_raised(struct tty_port *port)
{
- if (port->ops->carrier_raised == NULL)
+ if (!port->ops || !port->ops->carrier_raised)
return 1;
return port->ops->carrier_raised(port);
}
@@ -414,7 +414,7 @@
*/
void tty_port_raise_dtr_rts(struct tty_port *port)
{
- if (port->ops->dtr_rts)
+ if (port->ops && port->ops->dtr_rts)
port->ops->dtr_rts(port, 1);
}
EXPORT_SYMBOL(tty_port_raise_dtr_rts);
@@ -429,7 +429,7 @@
*/
void tty_port_lower_dtr_rts(struct tty_port *port)
{
- if (port->ops->dtr_rts)
+ if (port->ops && port->ops->dtr_rts)
port->ops->dtr_rts(port, 0);
}
EXPORT_SYMBOL(tty_port_lower_dtr_rts);
@@ -684,7 +684,7 @@
if (!tty_port_initialized(port)) {
clear_bit(TTY_IO_ERROR, &tty->flags);
- if (port->ops->activate) {
+ if (port->ops && port->ops->activate) {
int retval = port->ops->activate(port, tty);
if (retval) {
mutex_unlock(&port->mutex);
