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| author | Maarten Brock <m.brock@vanmierlo.com> | 2016-02-16 20:59:03 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-03-08 03:11:14 +0300 |
| commit | 19606eaf0b7b791fd5ecb61017ce0b367cce74a0 (patch) | |
| tree | 33ef15fb275b67d7e298c441b3b95e713a6e45fd /drivers/tty/serial/uartlite.c | |
| parent | 2905697a82eaf20606ced164d853b52d1b94aaa8 (diff) | |
| download | linux-19606eaf0b7b791fd5ecb61017ce0b367cce74a0.tar.xz | |
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>
Diffstat (limited to 'drivers/tty/serial/uartlite.c')
| -rw-r--r-- | drivers/tty/serial/uartlite.c | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/drivers/tty/serial/uartlite.c b/drivers/tty/serial/uartlite.c index f4ad0db74dca..9ffbeef913e1 100644 --- a/drivers/tty/serial/uartlite.c +++ b/drivers/tty/serial/uartlite.c @@ -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); |