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altera_uart: Don't take spinlock in already protected functions 

Don't take the port spinlock in uart functions where the serial core
already takes care of locking/unlocking them.

The code would actually lock up on architectures where spinlocks are
implemented (not the case on nios2 where this driver is primarily used
for now, thus this bug didn't trigger).

Also protect calling altera_uart_rx_chars/altera_uart_tx_chars in the
interrupt handler by the port spinlock.

Thanks to Ian Abbott for pointing these issues out.

Cc: Ian Abbott <abbotti@mev.co.uk>
Cc: Thomas Chou <thomas@wytron.com.tw>
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Tobias Klauser 2010-05-25 16:59:55 +02:00 committed by Greg Kroah-Hartman
parent 328be395a3
commit d8d721f4c0
1 changed files with 4 additions and 15 deletions
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19
drivers/serial/altera_uart.c
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@ -89,15 +89,12 @@ static unsigned int altera_uart_tx_empty(struct uart_port *port)
static unsigned int altera_uart_get_mctrl(struct uart_port *port)
{
struct altera_uart *pp = container_of(port, struct altera_uart, port);
unsigned long flags;
unsigned int sigs;
spin_lock_irqsave(&port->lock, flags);
sigs =
(readl(port->membase + ALTERA_UART_STATUS_REG) &
ALTERA_UART_STATUS_CTS_MSK) ? TIOCM_CTS : 0;
sigs |= (pp->sigs & TIOCM_RTS);
spin_unlock_irqrestore(&port->lock, flags);
return sigs;
}
@ -105,49 +102,37 @@ static unsigned int altera_uart_get_mctrl(struct uart_port *port)
static void altera_uart_set_mctrl(struct uart_port *port, unsigned int sigs)
{
struct altera_uart *pp = container_of(port, struct altera_uart, port);
unsigned long flags;
spin_lock_irqsave(&port->lock, flags);
pp->sigs = sigs;
if (sigs & TIOCM_RTS)
pp->imr |= ALTERA_UART_CONTROL_RTS_MSK;
else
pp->imr &= ~ALTERA_UART_CONTROL_RTS_MSK;
writel(pp->imr, port->membase + ALTERA_UART_CONTROL_REG);
spin_unlock_irqrestore(&port->lock, flags);
}
static void altera_uart_start_tx(struct uart_port *port)
{
struct altera_uart *pp = container_of(port, struct altera_uart, port);
unsigned long flags;
spin_lock_irqsave(&port->lock, flags);
pp->imr |= ALTERA_UART_CONTROL_TRDY_MSK;
writel(pp->imr, port->membase + ALTERA_UART_CONTROL_REG);
spin_unlock_irqrestore(&port->lock, flags);
}
static void altera_uart_stop_tx(struct uart_port *port)
{
struct altera_uart *pp = container_of(port, struct altera_uart, port);
unsigned long flags;
spin_lock_irqsave(&port->lock, flags);
pp->imr &= ~ALTERA_UART_CONTROL_TRDY_MSK;
writel(pp->imr, port->membase + ALTERA_UART_CONTROL_REG);
spin_unlock_irqrestore(&port->lock, flags);
}
static void altera_uart_stop_rx(struct uart_port *port)
{
struct altera_uart *pp = container_of(port, struct altera_uart, port);
unsigned long flags;
spin_lock_irqsave(&port->lock, flags);
pp->imr &= ~ALTERA_UART_CONTROL_RRDY_MSK;
writel(pp->imr, port->membase + ALTERA_UART_CONTROL_REG);
spin_unlock_irqrestore(&port->lock, flags);
}
static void altera_uart_break_ctl(struct uart_port *port, int break_state)
@ -272,10 +257,14 @@ static irqreturn_t altera_uart_interrupt(int irq, void *data)
unsigned int isr;
isr = readl(port->membase + ALTERA_UART_STATUS_REG) & pp->imr;
spin_lock(&port->lock);
if (isr & ALTERA_UART_STATUS_RRDY_MSK)
altera_uart_rx_chars(pp);
if (isr & ALTERA_UART_STATUS_TRDY_MSK)
altera_uart_tx_chars(pp);
spin_unlock(&port->lock);
return IRQ_RETVAL(isr);
}