lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Tue, 19 Jun 2018 22:59:14 +0200 From: Javier Martinez Canillas <javierm@...hat.com> To: linux-kernel@...r.kernel.org Cc: linux-arm-kernel@...ts.infradead.org, Mark Brown <broonie@...nel.org>, Tomeu Vizoso <tomeu.vizoso@...labora.com>, Andy Shevchenko <andy.shevchenko@...il.com>, Rob Herring <robh@...nel.org>, Javier Martinez Canillas <javierm@...hat.com>, Greg Kroah-Hartman <gregkh@...uxfoundation.org> Subject: [PATCH] driver core: add a debugfs entry to show deferred devices For debugging purposes it may be useful to know what are the devices whose probe function was deferred. Add a debugfs entry showing that information. $ cat /sys/kernel/debug/deferred_devices 48070000.i2c:twl@48:bci musb-hdrc.0.auto omapdrm.0 Signed-off-by: Javier Martinez Canillas <javierm@...hat.com> --- Changes since RFC v1: - Remove unneeded ret variable from deferred_devs_show() Changes since RFC v2: - Use DEFINE_SHOW_ATTRIBUTE() macro. - Don't propagate debugfs_create_file() error. - Remove IS_ENABLED(CONFIG_DEBUG_FS) guards. - Drop RFC prefix. drivers/base/dd.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/drivers/base/dd.c b/drivers/base/dd.c index 1435d7281c6..8ec9e3cfbe4 100644 --- a/drivers/base/dd.c +++ b/drivers/base/dd.c @@ -16,6 +16,7 @@ * Copyright (c) 2007-2009 Novell Inc. */ +#include <linux/debugfs.h> #include <linux/device.h> #include <linux/delay.h> #include <linux/dma-mapping.h> @@ -224,6 +225,24 @@ void device_unblock_probing(void) driver_deferred_probe_trigger(); } +/* + * deferred_devs_show() - Show the devices in the deferred probe pending list. + */ +static int deferred_devs_show(struct seq_file *s, void *data) +{ + struct device_private *curr; + + mutex_lock(&deferred_probe_mutex); + + list_for_each_entry(curr, &deferred_probe_pending_list, deferred_probe) + seq_printf(s, "%s\n", dev_name(curr->device)); + + mutex_unlock(&deferred_probe_mutex); + + return 0; +} +DEFINE_SHOW_ATTRIBUTE(deferred_devs); + /** * deferred_probe_initcall() - Enable probing of deferred devices * @@ -233,6 +252,9 @@ void device_unblock_probing(void) */ static int deferred_probe_initcall(void) { + debugfs_create_file("deferred_devices", 0444, NULL, NULL, + &deferred_devs_fops); + driver_deferred_probe_enable = true; driver_deferred_probe_trigger(); /* Sort as many dependencies as possible before exiting initcalls */ -- 2.17.1
Powered by blists - more mailing lists