Messages in this thread | | | Date | Mon, 4 Apr 2005 20:39:37 +0200 (CEST) | From | Jaroslav Kysela <> | Subject | Re: ALSA bugs with 2.6.12-rc1 |
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On Mon, 4 Apr 2005, Adrian Bunk wrote:
> On Mon, Apr 04, 2005 at 06:08:43PM +0100, Daniel Drake wrote: > > David Ford wrote: > > > It seems that 2.6.12-rc1 introduced an ALSA bug generating an oops for a > > > null pointer. > > > > > > codec_semaphore: semaphore is not ready [0x1][0x300300] > > > codec_read 0: semaphore is not ready for register 0x2c > > > Unable to handle kernel NULL pointer dereference at virtual address > > > 00000000 > > > > > > This happens on multiple machines, 32b and 64bit. I'll be happy to > > > provide further information if needed. > > > > This only happens when you mismatch your kernel and alsa-lib versions, e.g. > > running alsa-lib-1.0.9-rc2 with alsa-1.0.8 in-kernel drivers, or possibly > > vice-versa. > > Are you saying the userspace interface of the ALSA kernel drivers has > incompatible changes between minor versions of ALSA? > > If this is true, that's a serious bug.
Nope, but newer alsa-lib use an ALSA timer API feature which was not well debugged. This oops should be fixed in 2.6.12-rc2 and older libraries will work with newer kernels as well.
Jaroslav
----- Jaroslav Kysela <perex@suse.cz> Linux Kernel Sound Maintainer ALSA Project, SUSE Labs - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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