Re: [PATCH V2 3/3] n_gsm: wake up ldisc tty before using it

[Greg KH <gregkh@linuxfoundation.org>]

On Wed, May 27, 2015 at 10:50:01AM +0800, Zhang, Yanmin wrote:
> Wake up ldisc device before calling its driver to access the device.
> 
> Signed-off-by: Zhang Yanmin <yanmin.zhang@intel.com>
> 
> ---
> 
>  drivers/tty/n_gsm.c | 40 +++++++++++++++++++++++++++++++++++++++-
>  1 file changed, 39 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c
> index 2c34c32..40671fa 100644
> --- a/drivers/tty/n_gsm.c
> +++ b/drivers/tty/n_gsm.c
> @@ -62,6 +62,7 @@
>  #include <linux/netdevice.h>
>  #include <linux/etherdevice.h>
>  #include <linux/gsmmux.h>
> +#include <linux/pm_runtime.h>
>  
>  static int debug;
>  module_param(debug, int, 0600);
> @@ -555,6 +556,27 @@ static int gsm_stuff_frame(const u8 *input, u8 *output, int len)
>      return olen;
>  }
>  
> +static int pm_runtime_get_sync_tty(struct tty_struct *tty)
> +{
> +    int ret = 0;
> +
> +    /*Wakeup parent as tty itself doesn't enable runtime*/

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greg k-h