LKML Archive on
help / color / mirror / Atom feed
From: Mark Brown <>
To: Greg Kroah-Hartman <>
Cc: Heiko Stuebner <>,
	Bjorn Andersson <>,, Mark Brown <>
Subject: [PATCH] driver core: Make probe deferral more quiet
Date: Tue, 10 Mar 2015 11:55:49 +0000	[thread overview]
Message-ID: <> (raw)

Currently probe deferral prints a message every time a device requests
deferral at info severity (which is displayed by default). This can have
an impact on system boot times with serial consoles and is generally quite

Since subsystems and drivers should already be logging the specific reason
for probe deferral in order to aid users in understanding problems the
messages from the driver core should be redundant lower the severity of
the messages printed, cutting down on the volume of output on the console.

This does mean that if the drivers and subsystems aren't doing a good job
we get no output on the console by default. Ideally we'd be able to arrange
to print if nothing else printed, though that's a little fun. Even better
would be to come up with a mechanism that explicitly does dependencies so
we don't have to keep polling and erroring.

Signed-off-by: Mark Brown <>
 drivers/base/dd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index cdc779cf79a3..a3abe628aa8d 100644
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -322,7 +322,7 @@ probe_failed:
 	if (ret == -EPROBE_DEFER) {
 		/* Driver requested deferred probing */
-		dev_info(dev, "Driver %s requests probe deferral\n", drv->name);
+		dev_dbg(dev, "Driver %s requests probe deferral\n", drv->name);
 		/* Did a trigger occur while probing? Need to re-trigger if yes */
 		if (local_trigger_count != atomic_read(&deferred_trigger_count))

             reply	other threads:[~2015-03-10 11:56 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-03-10 11:55 Mark Brown [this message]
2015-03-10 12:57 ` Bjorn Andersson

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \ \ \ \ \ \ \
    --subject='Re: [PATCH] driver core: Make probe deferral more quiet' \

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).