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ARM: PL011: Ensure IRQs are disabled in UART interrupt handler

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As the DMA support introduces a separate interrupt-time callback, our
interrupt handler will not be the only handler which takes the port
lock, so we need to ensure that IRQs are disabled.  We must use the
_irqsave variant so we don't inadvertently enable interrupts.

Acked-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2010-12-22 17:16:09 +00:00
parent ffca2b114c
commit 963cc981af
1 changed files with 3 additions and 2 deletions
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5
drivers/serial/amba-pl011.c
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@ -247,10 +247,11 @@ static void pl011_modem_status(struct uart_amba_port *uap)
static irqreturn_t pl011_int(int irq, void *dev_id) static irqreturn_t pl011_int(int irq, void *dev_id)
{ {
struct uart_amba_port *uap = dev_id; struct uart_amba_port *uap = dev_id;
unsigned long flags;
unsigned int status, pass_counter = AMBA_ISR_PASS_LIMIT; unsigned int status, pass_counter = AMBA_ISR_PASS_LIMIT;
int handled = 0; int handled = 0;
spin_lock(&uap->port.lock); spin_lock_irqsave(&uap->port.lock, flags);
status = readw(uap->port.membase + UART011_MIS); status = readw(uap->port.membase + UART011_MIS);
if (status) { if (status) {
@ -275,7 +276,7 @@ static irqreturn_t pl011_int(int irq, void *dev_id)
handled = 1; handled = 1;
} }
spin_unlock(&uap->port.lock); spin_unlock_irqrestore(&uap->port.lock, flags);
return IRQ_RETVAL(handled); return IRQ_RETVAL(handled);
} }