[PATCH 003/104] ALSA: opti9xx: Fix conflicting driver object name

Luis Henriques luis.henriques at canonical.com
Mon Sep 30 10:09:40 UTC 2013 -stable review patch.  If anyone has any objections, please let me know.


From: Takashi Iwai <tiwai at suse.de>

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 at intel.com>
Signed-off-by: Takashi Iwai <tiwai at suse.de>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
 sound/isa/opti9xx/opti92x-ad1848.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/sound/isa/opti9xx/opti92x-ad1848.c b/sound/isa/opti9xx/opti92x-ad1848.c
index d7ccf28..4589acd 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"
-#define DEV_NAME "opti92x"
 static char * snd_opti9xx_names[] = {
@@ -1126,7 +1122,7 @@ static void __devexit snd_opti9xx_pnp_remove(struct pnp_card_link * pcard)
 static struct pnp_card_driver opti9xx_pnpc_driver = {
-	.name		= "opti9xx",
+	.name		= DEV_NAME,
 	.id_table	= snd_opti9xx_pnpids,
 	.probe		= snd_opti9xx_pnp_probe,
 	.remove		= __devexit_p(snd_opti9xx_pnp_remove),

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