linux-kernel - RE: [PATCH] Staging: hv: vmbus: Show the modalias in /sys/bus/vmbus/devices/*/

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Date:	Fri, 2 Sep 2011 17:53:37 +0000
From:	KY Srinivasan <kys@...rosoft.com>
To:	Greg KH <gregkh@...e.de>, Olaf Hering <olaf@...fle.de>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"virtualization@...ts.osdl.org" <virtualization@...ts.osdl.org>
Subject: RE: [PATCH] Staging: hv: vmbus: Show the modalias in
 /sys/bus/vmbus/devices/*/



> -----Original Message-----
> From: Greg KH [mailto:gregkh@...e.de]
> Sent: Friday, September 02, 2011 12:36 PM
> To: Olaf Hering
> Cc: KY Srinivasan; linux-kernel@...r.kernel.org; devel@...uxdriverproject.org;
> virtualization@...ts.osdl.org
> Subject: Re: [PATCH] Staging: hv: vmbus: Show the modalias in
> /sys/bus/vmbus/devices/*/
> 
> On Fri, Sep 02, 2011 at 06:25:56PM +0200, Olaf Hering wrote:
> > Show a modalias file in /sys/bus/vmbus/devices/*/
> > Add a helper function to print the same content in modalias and uevent.
> >
> > Signed-off-by: Olaf Hering <olaf@...fle.de>
> 
> Nice idea, thanks for this, one minor nit below:
> 
> > ---
> >  drivers/staging/hv/vmbus_drv.c |   21 ++++++++++++++++-----
> >  1 file changed, 16 insertions(+), 5 deletions(-)
> >
> > --- a/drivers/staging/hv/vmbus_drv.c
> > +++ b/drivers/staging/hv/vmbus_drv.c
> > @@ -93,6 +93,14 @@ static void get_channel_info(struct hv_d
> >  		debug_info.outbound.bytes_avail_towrite;
> >  }
> >
> > +#define VMBUS_ALIAS_LEN ((sizeof((struct hv_vmbus_device_id *)0)->guid)
> * 2)
> > +static void print_alias_name(struct hv_device *hv_dev, char *alias_name)
> > +{
> > +	int i;
> > +	for (i = 0; i < VMBUS_ALIAS_LEN; i += 2)
> > +		sprintf(&alias_name[i], "%02x", hv_dev->dev_type.b[i/2]);
> > +}
> > +
> >  /*
> >   * vmbus_show_device_attr - Show the device attribute in sysfs.
> >   *
> > @@ -105,6 +113,7 @@ static ssize_t vmbus_show_device_attr(st
> >  {
> >  	struct hv_device *hv_dev = device_to_hv_device(dev);
> >  	struct hv_device_info device_info;
> > +	char alias_name[VMBUS_ALIAS_LEN + 1];
> 
> Is that too big to put on the stack?  64 bytes, right?  Hm, maybe not.
> 
> Wait, hv_device_info is huge, that should be dynamic in the first place.
> Olaf, not your issue, but KY, want to fix that up?

hv_device_info is about 101 bytes. I will fix this. Greg, if you are applying Olaf's patch,
I will generate my patch on top of Olaf's. Let me know.

Regards,

K. Y

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