diff options
| author | Johan Hovold <jhovold@gmail.com> | 2014-01-02 22:49:26 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-01-03 12:42:24 -0800 |
| commit | 7603381e3e7ffebe8c0b46c416fe0f88e13b4d34 (patch) | |
| tree | c8b66a648938286fb1770f6b1eeb61f745d1606c | |
| parent | 2534be34c9f728759e7e7ba69bab9d3a5cbb5984 (diff) | |
USB: cypress_m8: only wake up MSR queue on changes
Only wake up MSR wait queue on actual modem-status changes.
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/usb/serial/cypress_m8.c | 5 | ||||
| -rw-r--r-- | drivers/usb/serial/cypress_m8.h | 1 |
2 files changed, 5 insertions, 1 deletions
diff --git a/drivers/usb/serial/cypress_m8.c b/drivers/usb/serial/cypress_m8.c index 558605d646f3..07e003398613 100644 --- a/drivers/usb/serial/cypress_m8.c +++ b/drivers/usb/serial/cypress_m8.c @@ -1187,7 +1187,10 @@ static void cypress_read_int_callback(struct urb *urb) if (priv->current_status != priv->prev_status) { priv->diff_status |= priv->current_status ^ priv->prev_status; - wake_up_interruptible(&port->port.delta_msr_wait); + + if (priv->diff_status & UART_MSR_MASK) + wake_up_interruptible(&port->port.delta_msr_wait); + priv->prev_status = priv->current_status; } spin_unlock_irqrestore(&priv->lock, flags); diff --git a/drivers/usb/serial/cypress_m8.h b/drivers/usb/serial/cypress_m8.h index 68bfd5197a63..119d2e17077b 100644 --- a/drivers/usb/serial/cypress_m8.h +++ b/drivers/usb/serial/cypress_m8.h @@ -66,6 +66,7 @@ #define CONTROL_RTS 0x10 /* request to send */ #define CONTROL_RESET 0x08 /* sent with output report */ +#define UART_MSR_MASK 0xf0 #define UART_RI 0x80 /* ring indicator */ #define UART_CD 0x40 /* carrier detect */ #define UART_DSR 0x20 /* data set ready */ |