On 2018/11/16 上午7:01, Pierre-Louis Bossart wrote:
Hi Keyon,
The machine_quirk may return NULL which means the acpi entries should be
skipped and search for next matched entry is needed, here add return
check here and continue for NULL case.
Nice catch, this was missed in the other patchset since the ACPI ID to
ignore was the last in the table...
Acked-by: Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx>
I was wondering if this patch was merged, but actually it's good Mark
wasn't copied on this one: the code doesn't quite work as intended and
shouldn't be merged as is.
Chintan and I see an oops and reboot on KBL Chromebooks, when the quirk
returns NULL, the mach variable becomes NULL and cannot be modified with
pointer arithmetic (which doesn't show with the diff format).
Ah, yeap, I omitted this, so we may need introduce a new pointer to fix
that, something like this:
diff --git a/sound/soc/soc-acpi.c b/sound/soc/soc-acpi.c
index b8e72b52db30..0d967d0ca222 100644
--- a/sound/soc/soc-acpi.c
+++ b/sound/soc/soc-acpi.c
@@ -10,11 +10,22 @@ struct snd_soc_acpi_mach *
snd_soc_acpi_find_machine(struct snd_soc_acpi_mach *machines)
{
struct snd_soc_acpi_mach *mach;
+ struct snd_soc_acpi_mach *quirk_mach = NULL;
for (mach = machines; mach->id[0]; mach++) {
if (acpi_dev_present(mach->id, NULL, -1)) {
- if (mach->machine_quirk)
- mach = mach->machine_quirk(mach);
+ if (mach->machine_quirk) {
+ quirk_mach = mach->machine_quirk(mach);
+
+ if (!quirk_mach)
+ /* skip if no quirk matched */
+ continue;
+ else
+ /* return quirk matched machine */
+ return quirk_mach;
+ }
+
+ /* return acpi matched machine directly */
return mach;
}
}
It's very likely btw that anyone trying a recent kernel on these devices
would not see the audio driver probe at all, so we do want to try other
entries - but of course without this nasty side effect. I will submit a
v2 when I've sorted out other problems on Chrome.
That's fine.
Thanks,
~Keyon
Thanks
-Pierre
Signed-off-by: Keyon Jie <yang.jie@xxxxxxxxxxxxxxx>
---
sound/soc/soc-acpi.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/sound/soc/soc-acpi.c b/sound/soc/soc-acpi.c
index b8e72b52db30..faf8941363e4 100644
--- a/sound/soc/soc-acpi.c
+++ b/sound/soc/soc-acpi.c
@@ -15,7 +15,10 @@ snd_soc_acpi_find_machine(struct snd_soc_acpi_mach
*machines)
if (acpi_dev_present(mach->id, NULL, -1)) {
if (mach->machine_quirk)
mach = mach->machine_quirk(mach);
- return mach;
+
+ /* return matched machine, continue otherwise */
+ if (mach)
+ return mach;
}
}
return NULL;
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