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serial-uartlite: Spinlock inside the loop. 

Better to hold the spinlock as short as possible.

Signed-off-by: Maarten Brock <m.brock@vanmierlo.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Maarten Brock 2016-02-16 18:59:03 +01:00 committed by Greg Kroah-Hartman
parent 2905697a82
commit 19606eaf0b
1 changed files with 4 additions and 5 deletions
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9
drivers/tty/serial/uartlite.c
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@ -193,19 +193,18 @@ static int ulite_transmit(struct uart_port *port, int stat)
static irqreturn_t ulite_isr(int irq, void *dev_id)
{
struct uart_port *port = dev_id;
int busy, n = 0;
int stat, busy, n = 0;
unsigned long flags;
spin_lock_irqsave(&port->lock, flags);
do {
int stat = uart_in32(ULITE_STATUS, port);
spin_lock_irqsave(&port->lock, flags);
stat = uart_in32(ULITE_STATUS, port);
busy = ulite_receive(port, stat);
busy |= ulite_transmit(port, stat);
spin_unlock_irqrestore(&port->lock, flags);
n++;
} while (busy);
spin_unlock_irqrestore(&port->lock, flags);
/* work done? */
if (n > 1) {
tty_flip_buffer_push(&port->state->port);