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053b47ff24
android_kernel_xiaomi_sm8350/drivers/isdn
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Michael Buesch 053b47ff24 [PATCH] Workaround CAPI subsystem locking issue 
I think the following patch should go into the kernel, until the ISDN/CAPI
guys create the real fix for this issue.

The issue is a concurrency issue with some internal CAPI data structure
which can crash the kernel.

On my FritzCard DSL with the AVM driver it crashes about once a day without
this workaround patch.  With this workaround patch it's rock-stable (at
least on UP, but I don't see why this shouldn't work on SMP as well.  But
maybe I'm missing something.)

This workaround is kind of a sledgehammer which inserts a global lock to
wrap around all the critical sections.  Of course, this is a scalability
issue, if you have many ISDN/CAPI cards.  But it prevents a crash.  So I
vote for this fix to get merged, until people come up with a better
solution.  Better have a stable kernel that's less scalable, than a
crashing and useless kernel.

This bug is in the kernel since 2.6.15 (at least).

Signed-off-by: Michael Buesch <mb@bu3sch.de>
Cc: Kai Germaschewski <kai.germaschewski@gmx.de>
Cc: Karsten Keil <kkeil@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-12 09:48:35 -08:00
..
act2000 [PATCH] getting rid of all casts of k[cmz]alloc() calls 2006-12-13 09:05:58 -08:00
capi [PATCH] Workaround CAPI subsystem locking issue 2007-02-12 09:48:35 -08:00
divert [PATCH] getting rid of all casts of k[cmz]alloc() calls 2006-12-13 09:05:58 -08:00
gigaset [PATCH] drivers/isdn/gigaset: new M101 driver (v2) 2007-02-12 09:48:30 -08:00
hardware [PATCH] drivers/isdn/hardware/eicon/: convert to generic boolean-values 2007-02-12 09:48:35 -08:00
hisax [PATCH] drivers/isdn/hisax/: Convert to generic boolean-values 2007-02-12 09:48:35 -08:00
hysdn [PATCH] getting rid of all casts of k[cmz]alloc() calls 2006-12-13 09:05:58 -08:00
i4l [PATCH] Char: tty_wakeup cleanup 2007-02-11 10:51:26 -08:00
icn [PATCH] isdn: replace kmalloc+memset with kzalloc 2006-12-08 08:29:01 -08:00
isdnloop [PATCH] isdn: replace kmalloc+memset with kzalloc 2006-12-08 08:29:01 -08:00
pcbit [PATCH] drivers/isdn/pcbit/: proper prototypes 2007-02-12 09:48:34 -08:00
sc [PATCH] drivers/isdn/sc/: proper prototypes 2007-02-12 09:48:34 -08:00
Kconfig
Makefile [PATCH] isdn4linux: Siemens Gigaset drivers - Kconfigs and Makefiles 2006-03-26 08:57:05 -08:00