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Date: Wed, 18 Apr 2012 20:47:01 +0100 From: Alan Cox <alan@...rguk.ukuu.org.uk> To: "Shankarmurthy, Akshay" <akshay.s@...com> Cc: "linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>, "alan@...ux.intel.com" <alan@...ux.intel.com>, "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>, "paul.gortmaker@...driver.com" <paul.gortmaker@...driver.com>, "jamie@...ieiles.com" <jamie@...ieiles.com>, "swarren@...dia.com" <swarren@...dia.com>, "dianders@...omium.org" <dianders@...omium.org>, "davinci-linux-open-source@...ux.davincidsp.com" <davinci-linux-open-source@...ux.davincidsp.com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> Subject: Re: [PATCH] serial: 8250: Add cpufreq support > As per my understanding, tty count keeps the count of tty_open and tty_release, that is > how many open and close happened on the tty device file(/dev/ttyS*). > The requirement here is a tty count check, if it is greater than zero then only it should > proceed for further execution. The physical port has a different lifetime to the struct tty_struct (which may change many times within the lifetime of the port). You can't simply go from the port to a tty struct and assume this is safe and will not change. > Kindly elaborate more on the same if it's not correct. Look at how tty_port_tty_get is used -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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