From: Saravana Kannan <saravanak@google.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"Rafael J. Wysocki" <rafael@kernel.org>,
Andrew Lunn <andrew@lunn.ch>,
Heiner Kallweit <hkallweit1@gmail.com>,
Russell King <linux@armlinux.org.uk>,
"David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>, Len Brown <lenb@kernel.org>,
Saravana Kannan <saravanak@google.com>
Cc: John Stultz <john.stultz@linaro.org>,
Marek Szyprowski <m.szyprowski@samsung.com>,
Rob Herring <robh+dt@kernel.org>,
Geert Uytterhoeven <geert@linux-m68k.org>,
Vladimir Oltean <olteanv@gmail.com>,
kernel-team@android.com, linux-kernel@vger.kernel.org,
netdev@vger.kernel.org, linux-acpi@vger.kernel.org
Subject: [PATCH v2 2/6] driver core: Set deferred probe reason when deferred by driver core
Date: Wed, 15 Sep 2021 01:11:34 -0700 [thread overview]
Message-ID: <20210915081139.480263-3-saravanak@google.com> (raw)
In-Reply-To: <20210915081139.480263-1-saravanak@google.com>
When the driver core defers the probe of a device, set the deferred
probe reason so that it's easier to debug. The deferred probe reason is
available in debugfs under devices_deferred.
Signed-off-by: Saravana Kannan <saravanak@google.com>
---
drivers/base/core.c | 15 +++++++++------
1 file changed, 9 insertions(+), 6 deletions(-)
diff --git a/drivers/base/core.c b/drivers/base/core.c
index 316df6027093..ca6c61a2e2e9 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -975,6 +975,7 @@ int device_links_check_suppliers(struct device *dev)
{
struct device_link *link;
int ret = 0;
+ struct fwnode_handle *sup_fw;
/*
* Device waiting for supplier to become available is not allowed to
@@ -983,10 +984,11 @@ int device_links_check_suppliers(struct device *dev)
mutex_lock(&fwnode_link_lock);
if (dev->fwnode && !list_empty(&dev->fwnode->suppliers) &&
!fw_devlink_is_permissive()) {
- dev_dbg(dev, "probe deferral - wait for supplier %pfwP\n",
- list_first_entry(&dev->fwnode->suppliers,
- struct fwnode_link,
- c_hook)->supplier);
+ sup_fw = list_first_entry(&dev->fwnode->suppliers,
+ struct fwnode_link,
+ c_hook)->supplier;
+ dev_err_probe(dev, -EPROBE_DEFER, "wait for supplier %pfwP\n",
+ sup_fw);
mutex_unlock(&fwnode_link_lock);
return -EPROBE_DEFER;
}
@@ -1001,8 +1003,9 @@ int device_links_check_suppliers(struct device *dev)
if (link->status != DL_STATE_AVAILABLE &&
!(link->flags & DL_FLAG_SYNC_STATE_ONLY)) {
device_links_missing_supplier(dev);
- dev_dbg(dev, "probe deferral - supplier %s not ready\n",
- dev_name(link->supplier));
+ dev_err_probe(dev, -EPROBE_DEFER,
+ "supplier %s not ready\n",
+ dev_name(link->supplier));
ret = -EPROBE_DEFER;
break;
}
--
2.33.0.309.g3052b89438-goog
next prev parent reply other threads:[~2021-09-15 8:12 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20210915081147eucas1p130ee8d5f1910ea3be265d37e4236a606@eucas1p1.samsung.com>
2021-09-15 8:11 ` [PATCH v2 0/6] fw_devlink improvements Saravana Kannan
2021-09-15 8:11 ` [PATCH v2 1/6] driver core: fw_devlink: Improve handling of cyclic dependencies Saravana Kannan
2021-09-15 8:11 ` Saravana Kannan [this message]
2021-09-15 8:30 ` [PATCH v2 2/6] driver core: Set deferred probe reason when deferred by driver core Geert Uytterhoeven
2021-09-15 8:11 ` [PATCH v2 3/6] driver core: Create __fwnode_link_del() helper function Saravana Kannan
2021-09-15 8:11 ` [PATCH v2 4/6] driver core: Add debug logs when fwnode links are added/deleted Saravana Kannan
2021-09-15 8:11 ` [PATCH v2 5/6] driver core: fw_devlink: Add support for FWNODE_FLAG_NEEDS_CHILD_BOUND_ON_ADD Saravana Kannan
2021-09-15 8:11 ` [PATCH v2 6/6] net: mdiobus: Set FWNODE_FLAG_NEEDS_CHILD_BOUND_ON_ADD for mdiobus parents Saravana Kannan
2021-09-15 8:44 ` [PATCH v2 0/6] fw_devlink improvements Marek Szyprowski
2021-09-15 16:44 ` Saravana Kannan
2021-09-17 9:18 ` Marek Szyprowski
2021-09-15 12:14 ` Andrew Lunn
2021-09-15 17:18 ` Saravana Kannan
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