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| author | Takashi Iwai <tiwai@suse.de> | 2013-08-27 12:03:01 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-09-07 22:09:57 -0700 |
| commit | c990ab45cb4fda0767b196f4303372bdad4f9f7a (patch) | |
| tree | cb050fac496055da6dd7f55c4d9c3d0f07e4ed06 /sound/isa | |
| parent | 35133cc34699a77d66a26f6a115b275a38868127 (diff) | |
| download | lwn-c990ab45cb4fda0767b196f4303372bdad4f9f7a.tar.gz lwn-c990ab45cb4fda0767b196f4303372bdad4f9f7a.zip | |
ALSA: opti9xx: Fix conflicting driver object name
commit fb615499f0ad28ed74201c1cdfddf9e64e205424 upstream.
The recent commit to delay the release of kobject triggered NULL
dereferences of opti9xx drivers. The cause is that all
snd-opti92x-ad1848, snd-opti92x-cs4231 and snd-opti93x drivers
register the PnP card driver with the very same name, and also
snd-opti92x-ad1848 and -cs4231 drivers register the ISA driver with
the same name, too. When these drivers are built in, quick
"register-release-and-re-register" actions occur, and this results in
Oops because of the same name is assigned to the kobject.
The fix is simply to assign individual names. As a bonus, by using
KBUILD_MODNAME, the patch reduces more lines than it adds.
The fix is based on the suggestion by Russell King.
Reported-and-tested-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'sound/isa')
| -rw-r--r-- | sound/isa/opti9xx/opti92x-ad1848.c | 8 |
1 files changed, 2 insertions, 6 deletions
diff --git a/sound/isa/opti9xx/opti92x-ad1848.c b/sound/isa/opti9xx/opti92x-ad1848.c index b41ed8661b23..e427dbf76368 100644 --- a/sound/isa/opti9xx/opti92x-ad1848.c +++ b/sound/isa/opti9xx/opti92x-ad1848.c @@ -173,11 +173,7 @@ MODULE_DEVICE_TABLE(pnp_card, snd_opti9xx_pnpids); #endif /* CONFIG_PNP */ -#ifdef OPTi93X -#define DEV_NAME "opti93x" -#else -#define DEV_NAME "opti92x" -#endif +#define DEV_NAME KBUILD_MODNAME static char * snd_opti9xx_names[] = { "unknown", @@ -1168,7 +1164,7 @@ static int snd_opti9xx_pnp_resume(struct pnp_card_link *pcard) static struct pnp_card_driver opti9xx_pnpc_driver = { .flags = PNP_DRIVER_RES_DISABLE, - .name = "opti9xx", + .name = DEV_NAME, .id_table = snd_opti9xx_pnpids, .probe = snd_opti9xx_pnp_probe, .remove = snd_opti9xx_pnp_remove, |