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| author | Adrian Hunter <adrian.hunter@intel.com> | 2017-11-02 11:22:53 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-11-08 13:50:17 +0100 |
| commit | 0ff26c662d5f3b26674d5205c8899d901f766acb (patch) | |
| tree | 3c0dc25b7f1f035495593cdbd86d370d2ee338d8 | |
| parent | 2b2d8788dd565cbe1ab22da6a1bc63d0934a80eb (diff) | |
| download | linux-0ff26c662d5f3b26674d5205c8899d901f766acb.tar.gz | |
driver core: Fix device link deferred probe
A device probe deferred because of a device link is never probed again because it is not added to the deferred_probe_pending_list. Add it, taking care of the race with driver_deferred_probe_trigger(). Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/base/dd.c | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/drivers/base/dd.c b/drivers/base/dd.c index ad44b40fe284..e4a5bef93344 100644 --- a/drivers/base/dd.c +++ b/drivers/base/dd.c @@ -350,6 +350,15 @@ EXPORT_SYMBOL_GPL(device_bind_driver); static atomic_t probe_count = ATOMIC_INIT(0); static DECLARE_WAIT_QUEUE_HEAD(probe_waitqueue); +static void driver_deferred_probe_add_trigger(struct device *dev, + int local_trigger_count) +{ + driver_deferred_probe_add(dev); + /* Did a trigger occur while probing? Need to re-trigger if yes */ + if (local_trigger_count != atomic_read(&deferred_trigger_count)) + driver_deferred_probe_trigger(); +} + static int really_probe(struct device *dev, struct device_driver *drv) { int ret = -EPROBE_DEFER; @@ -369,6 +378,8 @@ static int really_probe(struct device *dev, struct device_driver *drv) } ret = device_links_check_suppliers(dev); + if (ret == -EPROBE_DEFER) + driver_deferred_probe_add_trigger(dev, local_trigger_count); if (ret) return ret; @@ -469,10 +480,7 @@ pinctrl_bind_failed: case -EPROBE_DEFER: /* Driver requested deferred probing */ dev_dbg(dev, "Driver %s requests probe deferral\n", drv->name); - driver_deferred_probe_add(dev); - /* Did a trigger occur while probing? Need to re-trigger if yes */ - if (local_trigger_count != atomic_read(&deferred_trigger_count)) - driver_deferred_probe_trigger(); + driver_deferred_probe_add_trigger(dev, local_trigger_count); break; case -ENODEV: case -ENXIO: |