linux-kernel - Improving or replacing snd

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Message-ID: <Pine.LNX.4.44L0.1305291516090.885-100000@iolanthe.rowland.org>
Date:	Wed, 29 May 2013 15:27:55 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Takashi Iwai <tiwai@...e.de>
cc:	alsa-devel@...a-project.org,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Improving or replacing snd_printk()

Takashi:

Messages produced by snd_printk() aren't as informative as they could
be -- especially when CONFIG_SND_VERBOSE_PRINTK isn't enabled, which is
the case on most systems.

The routine uses printk() rather then dev_dbg(), dev_info(), or
dev_err().  As a result, the messages don't say what driver or device
is involved.  We just get something like:

[15919.883604] cannot submit urb (err = -18)

That's not much help to anybody.  If you didn't know what an urb was, 
you wouldn't even realize that this referred to a USB device.  And if 
you had multiple USB audio devices, you wouldn't know which one it 
referred to.

Has there been any thought of improving snd_printk(), or even better,
changing the call sites to use the dev_*() routines instead?

Alan Stern

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