2009/10/25 Oliver Neukum <oliver@xxxxxxxxxx>: > Am Sonntag, 25. Oktober 2009 18:51:00 schrieb bart.hartgers@xxxxxxxxx: >> + /* read modem status */ >> + unsigned status = atomic_read(&priv->msr); >> + /* modem control is output */ >> + unsigned ctrl = atomic_read(&priv->mcr); > > What is the sense of having two atomic variables? > You can get races where one is changed but the other is not. > > Regards > Oliver > > Hi Oliver, I don't think so. The two values are not really related. These are two separate things: mcr (modem control reg) is ultimately changed by whatever has the serial port open, msr (modem status register) represents the status of the handshaking lines, and is changed (via the interrupt urb callback) by hardware. Groeten, Bart -- Bart Hartgers - New e-mail: bart.hartgers@xxxxxxxxx -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
