[PATCH 0/7] driver core: prevent deferred probe with platform_driver_probe

Johan Hovold jhovold at gmail.com
Mon Sep 23 10:27:25 EDT 2013

Deferred probing cannot be used with platform_driver_probe as by the
time probing is retried either the driver has been unregistered or its
probe function has been set to platform_drv_probe_fail.

With commit e9354576 ("gpiolib: Defer failed gpio requests by default")
the gpio subsystem started returning -EPROBE_DEFER, which in turn
several platform drivers using platform_driver_probe return to driver
core. Other subsystems (e.g. regulator) has since started doing the

The first patch in this series prevents platform drivers using
platform_driver_probe from requesting probe deferral while warning that
it is not supported.

The remaining patches move six platform-driver probe functions that rely
on gpio_request out of __init. There are likely other probe functions
that might return -EPROBE_DEFER and should be moved out of __init as

Note that the mvsdio, at91_cf and pxa25x_udc patches are completely


Johan Hovold (7):
  driver core: prevent deferred probe with platform_driver_probe
  mmc: mvsdio: fix deferred probe from __init
  mtd: atmel_nand: fix deferred probe from __init
  pcmcia: at91_cf: fix deferred probe from __init
  usb: gadget: pxa25x_udc: fix deferred probe from __init
  usb: phy: gpio-vbus: fix deferred probe from __init
  backlight: atmel-pwm-bl: fix deferred probe from __init

 drivers/base/platform.c                | 17 +++++++++++++----
 drivers/mmc/host/mvsdio.c              | 11 ++++++-----
 drivers/mtd/nand/atmel_nand.c          | 13 +++++++------
 drivers/pcmcia/at91_cf.c               | 11 +++++------
 drivers/usb/gadget/pxa25x_udc.c        |  9 +++++----
 drivers/usb/phy/phy-gpio-vbus-usb.c    | 11 +++++------
 drivers/video/backlight/atmel-pwm-bl.c |  9 +++++----
 include/linux/platform_device.h        |  1 +
 8 files changed, 47 insertions(+), 35 deletions(-)


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