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[ALSA] prevent oops & dead keyboard on usb unplugging while the device is being used

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USB generic driver,USB USX2Y
Without this patch, some usb kobjects, which are parents to
the usx2y's kobjects can be freed before the usx2y's.
This led to an oops in get_kobj_path_length() and a dead
keyboard, when the usx2y's kobjects were freed.
The patch ensures the correct sequence.
Tested ok on kernel 2.6.12-rc2.

Signed-off-by: Karsten Wiese <annabellesgarden@yahoo.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Karsten Wiese 2005-04-20 10:12:35 +02:00 committed by Jaroslav Kysela
parent fe5ac9dcfe
commit 230cd5e248
2 changed files with 8 additions and 5 deletions
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2
sound/usb/usbaudio.c
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@ -3289,7 +3289,7 @@ static void snd_usb_audio_disconnect(struct usb_device *dev, void *ptr)
}
usb_chip[chip->index] = NULL;
up(&register_mutex);
snd_card_free_in_thread(card);
snd_card_free(card);
} else {
up(&register_mutex);
}

11
sound/usb/usx2y/usbusx2y.c
View file

@ -1,6 +1,11 @@
/*
* usbusy2y.c - ALSA USB US-428 Driver
*
2005-04-14 Karsten Wiese
Version 0.8.7.2:
Call snd_card_free() instead of snd_card_free_in_thread() to prevent oops with dead keyboard symptom.
Tested ok with kernel 2.6.12-rc2.
2004-12-14 Karsten Wiese
Version 0.8.7.1:
snd_pcm_open for rawusb pcm-devices now returns -EBUSY if called without rawusb's hwdep device being open.
@ -143,7 +148,7 @@
MODULE_AUTHOR("Karsten Wiese <annabellesgarden@yahoo.de>");
MODULE_DESCRIPTION("TASCAM "NAME_ALLCAPS" Version 0.8.7.1");
MODULE_DESCRIPTION("TASCAM "NAME_ALLCAPS" Version 0.8.7.2");
MODULE_LICENSE("GPL");
MODULE_SUPPORTED_DEVICE("{{TASCAM(0x1604), "NAME_ALLCAPS"(0x8001)(0x8005)(0x8007) }}");
@ -430,8 +435,6 @@ static void usX2Y_usb_disconnect(struct usb_device* device, void* ptr)
if (ptr) {
usX2Ydev_t* usX2Y = usX2Y((snd_card_t*)ptr);
struct list_head* p;
if (usX2Y->chip_status == USX2Y_STAT_CHIP_HUP) // on 2.6.1 kernel snd_usbmidi_disconnect()
return; // calls us back. better leave :-) .
usX2Y->chip.shutdown = 1;
usX2Y->chip_status = USX2Y_STAT_CHIP_HUP;
usX2Y_unlinkSeq(&usX2Y->AS04);
@ -443,7 +446,7 @@ static void usX2Y_usb_disconnect(struct usb_device* device, void* ptr)
}
if (usX2Y->us428ctls_sharedmem)
wake_up(&usX2Y->us428ctls_wait_queue_head);
snd_card_free_in_thread((snd_card_t*)ptr);
snd_card_free((snd_card_t*)ptr);
}
}