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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
resources.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20191206132219.28908-1-geert+renesas@glider.be
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
alistair/sensors
Geert Uytterhoeven 2019-12-06 14:22:19 +01:00 committed by Greg Kroah-Hartman
parent 264d25275a
commit 7c35e699c8
1 changed files with 4 additions and 1 deletions
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5
drivers/base/dd.c
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@ -516,7 +516,10 @@ static int really_probe(struct device *dev, struct device_driver *drv)
atomic_inc(&probe_count);
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;
}
re_probe:
dev->driver = drv;