Messages in this thread | | | Date | Tue, 27 Dec 2022 13:07:05 -0800 | Subject | Re: [RFC PATCH 04/14] sound: usb: card: Introduce USB SND vendor op callbacks | From | Wesley Cheng <> |
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Hi Dmitry,
On 12/24/2022 3:03 AM, Dmitry Baryshkov wrote: > Hi, > > On Sat, 24 Dec 2022 at 01:33, Wesley Cheng <quic_wcheng@quicinc.com> wrote: >> >> Allow for different vendors to be notified on USB SND connect/disconnect >> seqeunces. This allows for vendor USB SND modules to properly initialize >> and populate internal structures with references to the USB SND chip >> device. > > The commit message definitely needs some improvement. We do not notify > vendors on SND connect/disconnect events. > > >> >> Signed-off-by: Wesley Cheng <quic_wcheng@quicinc.com> >> --- >> sound/usb/card.c | 22 ++++++++++++++++++++++ >> sound/usb/card.h | 7 +++++++ >> 2 files changed, 29 insertions(+) >> >> diff --git a/sound/usb/card.c b/sound/usb/card.c >> index 26268ffb8274..212f55a7683c 100644 >> --- a/sound/usb/card.c >> +++ b/sound/usb/card.c >> @@ -117,6 +117,21 @@ MODULE_PARM_DESC(skip_validation, "Skip unit descriptor validation (default: no) >> static DEFINE_MUTEX(register_mutex); >> static struct snd_usb_audio *usb_chip[SNDRV_CARDS]; >> static struct usb_driver usb_audio_driver; >> +static struct snd_usb_vendor_ops *vendor_ops; >> + >> +int snd_usb_register_vendor_ops(struct snd_usb_vendor_ops *ops) > > platform ops? >
Will change it.
>> +{ >> + vendor_ops = ops; >> + return 0; >> +} >> +EXPORT_SYMBOL_GPL(snd_usb_register_vendor_ops); > > What happens if several platforms try to register different ops? I saw > from the patch 09/14 that you register these ops unconditionally. If > other devices follow your approach there is an obvious conflict. >
Thank you for the review.
That is true. I don't think there is a proper need to have multiple vendor ops being registered, so maybe just returning an error for if ops are already registered is sufficient.
Thanks Wesley Cheng
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