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driver core: Set deferred probe reason when deferred by driver core

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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.

Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Saravana Kannan <saravanak@google.com>
Link: https://lore.kernel.org/r/20210915172808.620546-2-saravanak@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Saravana Kannan 2021-09-15 10:28:05 -07:00 committed by Greg Kroah-Hartman
parent 04f41c68f1
commit 68223eeec7
1 changed files with 9 additions and 6 deletions
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15
drivers/base/core.c
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@ -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;
}