From: David Brownell <dbrownell@users.sourceforge.net>
Date: Fri, 6 Jun 2008 05:45:50 +0000 (-0700)
Subject: spi: fix refcount-related spidev oops-on-rmmod
X-Git-Tag: v2.6.26-rc6~93
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b2c8daddcbe03a22402ecf943bb88302601c6835;p=pandora-kernel.git

spi: fix refcount-related spidev oops-on-rmmod

This addresses other oopsing paths in "spidev" by changing how it manages
refcounting.  It decouples the lifecycle of the per-device data from the
class device (not just the spi device):

  - Use class_{create,destroy} not class_{register,unregister}.
  - Use device_{create,destroy} not device_{register,unregister}.
  - Free the per-device data only when TWO conditions are true:
      * Driver is unbound from underlying SPI device, and
      * Device is no longer open (new)

Also, spi_{get,set}_drvdata not dev_{get,set}_drvdata for simpler code.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Sebastian Siewior <bigeasy@tglx.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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