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serial: fsl_lpuart: split sysrq handling

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Instead of uart_handle_sysrq_char() use uart_prepare_sysrq_char() and
uart_unlock_and_check_sysrq(). This will call handle_sysrq() without
holding the port lock, which in turn let us drop the spin_trylock hack.

Suggested-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Michael Walle <michael@walle.cc>
Link: https://lore.kernel.org/r/20210512141255.18277-5-michael@walle.cc
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Michael Walle
2021-05-12 16:12:50 +02:00
committed by Greg Kroah-Hartman
parent 0d84f62220
commit 5697df7322
1 changed files with 6 additions and 6 deletions
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drivers/tty/serial/fsl_lpuart.c
+6 -6
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@@ -847,7 +847,7 @@ static void lpuart_rxint(struct lpuart_port *sport)
sr = readb(sport->port.membase + UARTSR1);
rx = readb(sport->port.membase + UARTDR);
if (uart_handle_sysrq_char(&sport->port, (unsigned char)rx))
if (uart_prepare_sysrq_char(&sport->port, rx))
continue;
if (sr & (UARTSR1_PE | UARTSR1_OR | UARTSR1_FE)) {
@@ -893,7 +893,7 @@ out:
writeb(UARTSFIFO_RXOF, sport->port.membase + UARTSFIFO);
}
spin_unlock(&sport->port.lock);
uart_unlock_and_check_sysrq(&sport->port);
tty_flip_buffer_push(port);
}
@@ -924,7 +924,7 @@ static void lpuart32_rxint(struct lpuart_port *sport)
rx = lpuart32_read(&sport->port, UARTDATA);
rx &= UARTDATA_MASK;
if (uart_handle_sysrq_char(&sport->port, rx))
if (uart_prepare_sysrq_char(&sport->port, rx))
continue;
if (sr & (UARTSTAT_PE | UARTSTAT_OR | UARTSTAT_FE)) {
@@ -959,7 +959,7 @@ static void lpuart32_rxint(struct lpuart_port *sport)
}
out:
spin_unlock(&sport->port.lock);
uart_unlock_and_check_sysrq(&sport->port);
tty_flip_buffer_push(port);
}
@@ -2272,7 +2272,7 @@ lpuart_console_write(struct console *co, const char *s, unsigned int count)
unsigned long flags;
int locked = 1;
if (sport->port.sysrq || oops_in_progress)
if (oops_in_progress)
locked = spin_trylock_irqsave(&sport->port.lock, flags);
else
spin_lock_irqsave(&sport->port.lock, flags);
@@ -2302,7 +2302,7 @@ lpuart32_console_write(struct console *co, const char *s, unsigned int count)
unsigned long flags;
int locked = 1;
if (sport->port.sysrq || oops_in_progress)
if (oops_in_progress)
locked = spin_trylock_irqsave(&sport->port.lock, flags);
else
spin_lock_irqsave(&sport->port.lock, flags);