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authorDominik Brodowski <linux@dominikbrodowski.net>2010-01-15 23:55:21 +0100
committerDominik Brodowski <linux@dominikbrodowski.net>2010-03-03 08:37:41 +0100
commita3f916f2c84f2b9e1d32cc0dbfe326a9e380dbfb (patch)
tree3ed5c2697322f8c6ac1bb2fbec5cc463b2143578 /drivers/pcmcia
parent6e83ee075ed74941ccaad4fec503f6b24646e7e0 (diff)
pcmcia: disable pcmcia ioctl for !ARM, prepare for removal
The PCMCIA ioctl -- deprecated for years -- suffers from insufficient locking. As it already has been deprecated for years, with its removal long overdue, limit it to !SMP and !PREEMPT. Furthermore, the last legitimate use of the ioctl to be reported relates to the ARM architecture in 2008.[1] Attempts to resolve this issue turned out unsuccessful so far.[2] Other usages have only been reported as hear-say. If there are any legitiate and necessary use-cases remaining, please speak out before the end of the grace period until 2.6.3{5,6}(-rc1). [1] http://lists.infradead.org/pipermail/linux-pcmcia/2008-April/005440.html see also: http://lkml.org/lkml/2008/2/27/291 [2] http://lists.infradead.org/pipermail/linux-pcmcia/2008-April/005450.html http://lists.infradead.org/pipermail/linux-pcmcia/2010-January/006740.html see also: http://lists.infradead.org/pipermail/linux-pcmcia/2008-April/005453.html CC: Russell King <rmk+kernel@arm.linux.org.uk> CC: Alan Cox <alan@lxorguk.ukuu.org.uk> CC: Robert P. J. Day <rpjday@crashcourse.ca> CC: Jaswinder Singh Rajput <jaswinder@kernel.org> CC: linux-kernel@vger.kernel.org Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Diffstat (limited to 'drivers/pcmcia')
-rw-r--r--drivers/pcmcia/Kconfig14
1 files changed, 10 insertions, 4 deletions
diff --git a/drivers/pcmcia/Kconfig b/drivers/pcmcia/Kconfig
index 0a6601c7680..d189e4743e6 100644
--- a/drivers/pcmcia/Kconfig
+++ b/drivers/pcmcia/Kconfig
@@ -51,17 +51,23 @@ config PCMCIA_LOAD_CIS
config PCMCIA_IOCTL
bool "PCMCIA control ioctl (obsolete)"
- depends on PCMCIA
+ depends on PCMCIA && ARM && !SMP && !PREEMPT
default y
help
If you say Y here, the deprecated ioctl interface to the PCMCIA
- subsystem will be built. It is needed by cardmgr and cardctl
- (pcmcia-cs) to function properly.
+ subsystem will be built. It is needed by the deprecated pcmcia-cs
+ tools (cardmgr, cardctl) to function properly.
You should use the new pcmciautils package instead (see
<file:Documentation/Changes> for location and details).
- If unsure, say Y.
+ This config option will most likely be removed from kernel 2.6.35,
+ the associated code from kernel 2.6.36.
+
+ As the PCMCIA ioctl is not locking safe, it depends on !SMP and
+ !PREEMPT.
+
+ If unsure, say N.
config CARDBUS
bool "32-bit CardBus support"