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Date: Tue, 15 May 2018 22:40:02 -0400 From: Pavel Tatashin <pasha.tatashin@...cle.com> To: pasha.tatashin@...cle.com, steven.sistare@...cle.com, daniel.m.jordan@...cle.com, linux-kernel@...r.kernel.org, jeffrey.t.kirsher@...el.com, intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org, gregkh@...uxfoundation.org, alexander.duyck@...il.com, tobin@...orbit.com, andy.shevchenko@...il.com Subject: [PATCH v5 1/3] drivers core: refactor device_shutdown device_shutdown() traverses through the list of devices, and calls dev->{bug/driver}->shutdown() for each entry in the list. Refactor the function by keeping device_shutdown() to do the logic of traversing the list of devices, and device_shutdown_one() to perform the actual shutdown operation on one device. Signed-off-by: Pavel Tatashin <pasha.tatashin@...cle.com> --- drivers/base/core.c | 50 +++++++++++++++++++++++++++------------------ 1 file changed, 30 insertions(+), 20 deletions(-) diff --git a/drivers/base/core.c b/drivers/base/core.c index b610816eb887..ed189f6d1a2f 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -2765,6 +2765,35 @@ int device_move(struct device *dev, struct device *new_parent, } EXPORT_SYMBOL_GPL(device_move); +/* + * device_shutdown_one - call ->shutdown() for the device passed as + * argument. + */ +static void device_shutdown_one(struct device *dev) +{ + /* Don't allow any more runtime suspends */ + pm_runtime_get_noresume(dev); + pm_runtime_barrier(dev); + + if (dev->class && dev->class->shutdown_pre) { + if (initcall_debug) + dev_info(dev, "shutdown_pre\n"); + dev->class->shutdown_pre(dev); + } + if (dev->bus && dev->bus->shutdown) { + if (initcall_debug) + dev_info(dev, "shutdown\n"); + dev->bus->shutdown(dev); + } else if (dev->driver && dev->driver->shutdown) { + if (initcall_debug) + dev_info(dev, "shutdown\n"); + dev->driver->shutdown(dev); + } + + /* decrement the reference counter */ + put_device(dev); +} + /** * device_shutdown - call ->shutdown() on each device to shutdown. */ @@ -2801,30 +2830,11 @@ void device_shutdown(void) device_lock(parent); device_lock(dev); - /* Don't allow any more runtime suspends */ - pm_runtime_get_noresume(dev); - pm_runtime_barrier(dev); - - if (dev->class && dev->class->shutdown_pre) { - if (initcall_debug) - dev_info(dev, "shutdown_pre\n"); - dev->class->shutdown_pre(dev); - } - if (dev->bus && dev->bus->shutdown) { - if (initcall_debug) - dev_info(dev, "shutdown\n"); - dev->bus->shutdown(dev); - } else if (dev->driver && dev->driver->shutdown) { - if (initcall_debug) - dev_info(dev, "shutdown\n"); - dev->driver->shutdown(dev); - } - + device_shutdown_one(dev); device_unlock(dev); if (parent) device_unlock(parent); - put_device(dev); put_device(parent); spin_lock(&devices_kset->list_lock); -- 2.17.0
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