From: "Bruno Prémont" <bonbons@linux-vserver.org>
To: David Herrmann <dh.herrmann@googlemail.com>
Cc: Jiri Kosina <jkosina@suse.cz>, linux-input@vger.kernel.org
Subject: HID, driver interaction with device during probe defeated by 4ea5454203d991ec85264f64f89ca8855fce69b0
Date: Mon, 9 Apr 2012 00:03:06 +0200 [thread overview]
Message-ID: <20120409000306.101c3427@neptune> (raw)
Hi,
picolcd driver stopped working (probe fails) recently, probably in
relation with commit 4ea5454203d991ec85264f64f89ca8855fce69b0
(HID: Fix race condition between driver core and ll-driver).
The probe code does send a report to the HID device to query version
information but times-out getting the response.
What would be the proper approach to fix this chicken-egg problem?
Semaphore introduced by above patch is only being released after
driver probe function has returned but prevents and incoming reports
from being delivered.
Touching the semaphore inside driver looks like a bad idea to me...
Thanks,
Bruno
next reply other threads:[~2012-04-08 22:13 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-08 22:03 Bruno Prémont [this message]
2012-04-09 10:36 ` HID, driver interaction with device during probe defeated by 4ea5454203d991ec85264f64f89ca8855fce69b0 David Herrmann
2012-05-05 10:58 ` Bruno Prémont
2012-05-05 11:56 ` David Herrmann
2012-05-05 12:19 ` Bruno Prémont
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