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Subject[PATCH v2] driver core: Print device when resources present in really_probe()
If a device already has devres items attached before probing, a warning
backtrace is printed. However, this backtrace does not reveal the
offending device, leaving the user uninformed. Furthermore, using
WARN_ON() causes systems with panic-on-warn to reboot.

Fix this by replacing the WARN_ON() by a dev_crit() message.
Abort probing the device, to prevent doing more damage to the device's

Signed-off-by: Geert Uytterhoeven <>
- Use dev_crit() instead of dev_WARN_ON(),
- Abort probing, as this is a critical situation.
drivers/base/dd.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index d811e60610d33ae9..b25bcab2a26bd2ad 100644
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -516,7 +516,10 @@ static int really_probe(struct device *dev, struct device_driver *drv)
pr_debug("bus: '%s': %s: probing driver %s with device %s\n",
drv->bus->name, __func__, drv->name, dev_name(dev));
- WARN_ON(!list_empty(&dev->devres_head));
+ if (!list_empty(&dev->devres_head)) {
+ dev_crit(dev, "Resources present before probing\n");
+ return -EBUSY;
+ }

dev->driver = drv;
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