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From: Ahmad Fatoum <a.fatoum@pengutronix.de>
To: barebox@lists.infradead.org
Cc: Ahmad Fatoum <a.fatoum@pengutronix.de>
Subject: [PATCH v2 2/3] driver: have CONFIG_DEBUG_PROBES report device unbind as well
Date: Thu, 13 Jan 2022 17:04:13 +0100
Message-ID: <20220113160414.3943151-2-a.fatoum@pengutronix.de> (raw)
In-Reply-To: <20220113160414.3943151-1-a.fatoum@pengutronix.de>

This aligns it with DEBUG_INITCALLS, which also traces exitcalls.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
v1 -> v2: no change
---
 common/Kconfig        | 10 ++++++++--
 drivers/base/driver.c |  4 ++++
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/common/Kconfig b/common/Kconfig
index 482faea933a6..060e21d9fedf 100644
--- a/common/Kconfig
+++ b/common/Kconfig
@@ -1524,9 +1524,15 @@ config DEBUG_INITCALLS
 	  If enabled this will print initcall traces.
 
 config DEBUG_PROBES
-	bool "Trace driver probes"
+	bool "Trace driver probes/removes"
 	help
-	  If enabled this will print driver probe traces.
+	  If enabled this will log driver probe and remove traces. If DEBUG_LL is enabled,
+	  probes will be printed even before registering consoles. If it's disabled, they
+	  will be collected in the log and written out once a console is active.
+
+	  Removes are written to the log and will be printed as long as consoles exist.
+	  Most consoles do not implement a remove callback to remain operable until
+	  the very end. Consoles using DMA, however, must be removed.
 
 config PBL_BREAK
 	bool "Execute software break on pbl start"
diff --git a/drivers/base/driver.c b/drivers/base/driver.c
index dd965eb165ee..bb07e96dcaf4 100644
--- a/drivers/base/driver.c
+++ b/drivers/base/driver.c
@@ -502,11 +502,15 @@ EXPORT_SYMBOL_GPL(dev_set_name);
 static void devices_shutdown(void)
 {
 	struct device_d *dev;
+	int depth = 0;
 
 	list_for_each_entry(dev, &active, active) {
 		if (dev->bus->remove) {
+			depth++;
+			pr_report_probe("%*sremove-> %s\n", depth * 4, "", dev_name(dev));
 			dev->bus->remove(dev);
 			dev->driver = NULL;
+			depth--;
 		}
 	}
 }
-- 
2.30.2


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  reply	other threads:[~2022-01-13 16:06 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-01-13 16:04 [PATCH v2 1/3] tlsf: dump stack on assertion failure Ahmad Fatoum
2022-01-13 16:04 ` Ahmad Fatoum [this message]
2022-01-13 16:04 ` [PATCH v2 3/3] commands: add new devunbind debugging command Ahmad Fatoum
2022-01-14  7:53 ` [PATCH v2 1/3] tlsf: dump stack on assertion failure Sascha Hauer

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