Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 7603381e authored by Johan Hovold's avatar Johan Hovold Committed by Greg Kroah-Hartman
Browse files

USB: cypress_m8: only wake up MSR queue on changes 



Only wake up MSR wait queue on actual modem-status changes.

Signed-off-by: default avatarJohan Hovold <jhovold@gmail.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 2534be34

drivers/usb/serial/cypress_m8.c

+4 −1
Original line number Diff line number Diff line
@@ -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;



		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);

drivers/usb/serial/cypress_m8.h

+1 −0
Original line number Diff line number Diff line
@@ -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 */