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mxser: cleanup LSR handling in mxser_receive_chars 

mxser_interrupt is a bit confusing as it passes a pointer to LSR
variable ("status") to mxser_receive_chars. That function can indeed
update the LCR variable. Make this clear by not passing a variable by
reference, instead, return updated status. And change its type
accordingly -- to u8.

Note that the next patches will rework ISR so that even the definition
of status will be u8 soon too.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20210618061516.662-13-jslaby@suse.cz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jiri Slaby 2021-06-18 08:14:18 +02:00 коммит произвёл Greg Kroah-Hartman
Родитель cef222cbff
Коммит 1551780603
1 изменённых файлов: 21 добавлений и 19 удалений
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40
drivers/tty/mxser.c
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@ -2056,8 +2056,8 @@ static int mxser_rs_break(struct tty_struct *tty, int break_state)
return 0;
}
static void mxser_receive_chars(struct tty_struct *tty,
struct mxser_port *port, int *status)
static u8 mxser_receive_chars(struct tty_struct *tty,
struct mxser_port *port, u8 status)
{
unsigned char ch, gdl;
int ignored = 0;
@ -2070,12 +2070,12 @@ static void mxser_receive_chars(struct tty_struct *tty,
mxser_stoprx(tty);
if (port->board->must_hwid != MOXA_OTHER_UART) {
if (*status & UART_LSR_SPECIAL)
if (status & UART_LSR_SPECIAL)
goto intr_old;
if (port->board->must_hwid == MOXA_MUST_MU860_HWID &&
(*status & MOXA_MUST_LSR_RERR))
(status & MOXA_MUST_LSR_RERR))
goto intr_old;
if (*status & MOXA_MUST_LSR_RERR)
if (status & MOXA_MUST_LSR_RERR)
goto intr_old;
gdl = inb(port->ioaddr + MOXA_MUST_GDL_REGISTER);
@ -2100,28 +2100,28 @@ intr_old:
break;
ch = inb(port->ioaddr + UART_RX);
if (port->board->must_hwid && (*status & UART_LSR_OE))
if (port->board->must_hwid && (status & UART_LSR_OE))
outb(0x23, port->ioaddr + UART_FCR);
*status &= port->read_status_mask;
if (*status & port->ignore_status_mask) {
status &= port->read_status_mask;
if (status & port->ignore_status_mask) {
if (++ignored > 100)
break;
} else {
char flag = 0;
if (*status & UART_LSR_SPECIAL) {
if (*status & UART_LSR_BI) {
if (status & UART_LSR_SPECIAL) {
if (status & UART_LSR_BI) {
flag = TTY_BREAK;
port->icount.brk++;
if (port->port.flags & ASYNC_SAK)
do_SAK(tty);
} else if (*status & UART_LSR_PE) {
} else if (status & UART_LSR_PE) {
flag = TTY_PARITY;
port->icount.parity++;
} else if (*status & UART_LSR_FE) {
} else if (status & UART_LSR_FE) {
flag = TTY_FRAME;
port->icount.frame++;
} else if (*status & UART_LSR_OE) {
} else if (status & UART_LSR_OE) {
flag = TTY_OVERRUN;
port->icount.overrun++;
} else
@ -2140,8 +2140,8 @@ intr_old:
if (port->board->must_hwid)
break;
*status = inb(port->ioaddr + UART_LSR);
} while (*status & UART_LSR_DR);
status = inb(port->ioaddr + UART_LSR);
} while (status & UART_LSR_DR);
end_intr:
mxvar_log.rxcnt[tty->index] += cnt;
@ -2149,6 +2149,8 @@ end_intr:
port->mon_data.up_rxcnt += cnt;
tty_flip_buffer_push(&port->port);
return status;
}
static void mxser_transmit_chars(struct tty_struct *tty, struct mxser_port *port)
@ -2262,14 +2264,14 @@ static irqreturn_t mxser_interrupt(int irq, void *dev_id)
iir == MOXA_MUST_IIR_RDA ||
iir == MOXA_MUST_IIR_RTO ||
iir == MOXA_MUST_IIR_LSR)
mxser_receive_chars(tty, port,
&status);
status = mxser_receive_chars(tty,
port, status);
} else {
status &= port->read_status_mask;
if (status & UART_LSR_DR)
mxser_receive_chars(tty, port,
&status);
status = mxser_receive_chars(tty,
port, status);
}
msr = inb(port->ioaddr + UART_MSR);
if (msr & UART_MSR_ANY_DELTA)