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TTY/Serial fixes for 6.8-rc5

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Here are 3 small tty and serial driver fixes for 6.8-rc5:
   - revert a 8250_pci1xxxx off-by-one change that was incorrect
   - 2 changes to fix the transmit path of the mxs-auart driver, fixing a
     regression in the 6.2 release
 
 All of these have been in linux-next for over a week with no reported
 issues.
 
 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'tty-6.8-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty

Pull tty / serial fixes from Greg KH:
 "Here are three small tty and serial driver fixes for 6.8-rc5:

   - revert a 8250_pci1xxxx off-by-one change that was incorrect

   - two changes to fix the transmit path of the mxs-auart driver,
     fixing a regression in the 6.2 release

  All of these have been in linux-next for over a week with no reported
  issues"

* tag 'tty-6.8-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty:
  serial: mxs-auart: fix tx
  serial: core: introduce uart_port_tx_flags()
  serial: 8250_pci1xxxx: partially revert off by one patch
This commit is contained in:
Linus Torvalds 2024-02-17 08:46:57 -08:00
commit 4b2981b227
3 changed files with 32 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/tty/serial/8250/8250_pci1xxxx.c
View File

@ -302,7 +302,7 @@ static void pci1xxxx_process_read_data(struct uart_port *port,
* to read, the data is received one byte at a time.
*/
while (valid_burst_count--) {
if (*buff_index >= (RX_BUF_SIZE - UART_BURST_SIZE))
if (*buff_index > (RX_BUF_SIZE - UART_BURST_SIZE))
break;
burst_buf = (u32 *)&rx_buff[*buff_index];
*burst_buf = readl(port->membase + UART_RX_BURST_FIFO);

5
drivers/tty/serial/mxs-auart.c
View File

@ -605,13 +605,16 @@ static void mxs_auart_tx_chars(struct mxs_auart_port *s)
return;
}
pending = uart_port_tx(&s->port, ch,
pending = uart_port_tx_flags(&s->port, ch, UART_TX_NOSTOP,
!(mxs_read(s, REG_STAT) & AUART_STAT_TXFF),
mxs_write(ch, s, REG_DATA));
if (pending)
mxs_set(AUART_INTR_TXIEN, s, REG_INTR);
else
mxs_clr(AUART_INTR_TXIEN, s, REG_INTR);
if (uart_tx_stopped(&s->port))
mxs_auart_stop_tx(&s->port);
}
static void mxs_auart_rx_char(struct mxs_auart_port *s)

32
include/linux/serial_core.h
View File

@ -748,8 +748,17 @@ struct uart_driver {
void uart_write_wakeup(struct uart_port *port);
#define __uart_port_tx(uport, ch, tx_ready, put_char, tx_done, for_test, \
for_post) \
/**
* enum UART_TX_FLAGS -- flags for uart_port_tx_flags()
*
* @UART_TX_NOSTOP: don't call port->ops->stop_tx() on empty buffer
*/
enum UART_TX_FLAGS {
UART_TX_NOSTOP = BIT(0),
};
#define __uart_port_tx(uport, ch, flags, tx_ready, put_char, tx_done, \
for_test, for_post) \
({ \
struct uart_port *__port = (uport); \
struct circ_buf *xmit = &__port->state->xmit; \
@ -777,7 +786,7 @@ void uart_write_wakeup(struct uart_port *port);
if (pending < WAKEUP_CHARS) { \
uart_write_wakeup(__port); \
\
if (pending == 0) \
if (!((flags) & UART_TX_NOSTOP) && pending == 0) \
__port->ops->stop_tx(__port); \
} \
\
@ -812,7 +821,7 @@ void uart_write_wakeup(struct uart_port *port);
*/
#define uart_port_tx_limited(port, ch, count, tx_ready, put_char, tx_done) ({ \
unsigned int __count = (count); \
__uart_port_tx(port, ch, tx_ready, put_char, tx_done, __count, \
__uart_port_tx(port, ch, 0, tx_ready, put_char, tx_done, __count, \
__count--); \
})
@ -826,8 +835,21 @@ void uart_write_wakeup(struct uart_port *port);
* See uart_port_tx_limited() for more details.
*/
#define uart_port_tx(port, ch, tx_ready, put_char) \
__uart_port_tx(port, ch, tx_ready, put_char, ({}), true, ({}))
__uart_port_tx(port, ch, 0, tx_ready, put_char, ({}), true, ({}))
/**
* uart_port_tx_flags -- transmit helper for uart_port with flags
* @port: uart port
* @ch: variable to store a character to be written to the HW
* @flags: %UART_TX_NOSTOP or similar
* @tx_ready: can HW accept more data function
* @put_char: function to write a character
*
* See uart_port_tx_limited() for more details.
*/
#define uart_port_tx_flags(port, ch, flags, tx_ready, put_char) \
__uart_port_tx(port, ch, flags, tx_ready, put_char, ({}), true, ({}))
/*
* Baud rate helpers.
*/