Re: [PATCH] usb: storage: make US_DEBUGPX print with LOGLEVEL_DEBUG

From: Greg Kroah-Hartman
Date: Tue Feb 16 2016 - 19:40:59 EST


On Tue, Feb 16, 2016 at 03:45:39PM -0800, Victor Dodon wrote:
> On Sun, Feb 14, 2016 at 05:20:21PM -0800, Greg Kroah-Hartman wrote:
> > On Wed, Feb 10, 2016 at 04:13:43PM -0800, Victor Dodon wrote:
> > > The US_DEBUGPX macro uses printk without specifying a kernel log level, so
> > > the default kernel log level is used, which may not match LOGLEVEL_DEBUG
> > > used in usb_stor_dbg. Use printk_emit with LOGLEVEL_DEBUG instead.
> > >
> > > Signed-off-by: Victor Dodon <printesoi@xxxxxxxxxxxx>
> > > ---
> > > drivers/usb/storage/debug.h | 10 ++++++++--
> > > 1 file changed, 8 insertions(+), 2 deletions(-)
> >
> > Can you just get rid of US_DEBUGPX() entirely please? It shouldn't be
> > needed anymore, just use usb_stor_dbg() instead.
>
> Using usb_stor_dbg() instead of US_DEBUGPX() in
> usb_stor_show_command() prints one byte per line with the full syslog
> header, like this:
>
> 7,0,Feb 16 14:30:41,ubuntu,kernel:,[ 422.876236] Command
> TEST_UNIT_READY (6 bytes)
> 7,0,Feb 16 14:30:41,ubuntu,kernel:,[ 422.876242] bytes:
> 7,0,Feb 16 14:30:41,ubuntu,kernel:,[ 422.876249] 00
> 7,0,Feb 16 14:30:41,ubuntu,kernel:,[ 422.876255] 00
> 7,0,Feb 16 14:30:41,ubuntu,kernel:,[ 422.876261] 00
> 7,0,Feb 16 14:30:41,ubuntu,kernel:,[ 422.876267] 00
> 7,0,Feb 16 14:30:41,ubuntu,kernel:,[ 422.876273] 00
> 7,0,Feb 16 14:30:41,ubuntu,kernel:,[ 422.876279] 00
> 7,0,Feb 16 14:30:41,ubuntu,kernel:,[ 422.876285]
>
> instead of the desired:
>
> 7,0,Feb 16 14:30:41,ubuntu,kernel:,[ 422.876236] Command
> TEST_UNIT_READY (6 bytes)
> 7,0,Feb 16 14:30:41,ubuntu,kernel:,[ 422.876242] bytes:
> 7,0,Feb 16 14:30:41,ubuntu,kernel:,[ 422.876249] 00 00 00 00 00 00
>
> this is why I think the US_DEBUGPX() macro is still needed.

Nope, fix the call to use the proper printk % modifier instead and you
will be fine. No need to keep reinventing the wheel, we have had
support for byte streams in messages for probably over a decade now...

Nice try though :)

thanks,

greg k-h