[patch 07/47] sound: emu10k1 - fix system hang with Audigy2 ZS Notebook PCMCIA card

Greg KH
2008-06-14T00:14:31Z

[-- Attachment #1: sound-emu10k1-fix-system-hang-with-audigy2-zs-notebook-pcmcia-card.patch --]
[-- Type: text/plain, Size: 2439 bytes --]

-stable review patch. If anyone has any objections, please let us know.

------------------
From: Jaroslav Franek <jarin.franek@post.cz>

upstream commit: 868e15dbd2940f9453b4399117686f408dc77299

When the Linux kernel is compiled with CONFIG_DEBUG_SHIRQ=y,
the Soundblaster Audigy2 ZS Notebook PCMCIA card causes the
system hang during boot (udev stage) or when the card is hot-plug.
The CONFIG_DEBUG_SHIRQ flag is by default 'y' with all Fedora
kernels since 2.6.23. The problem was reported as
https://bugzilla.redhat.com/show_bug.cgi?id=326411

The issue was hunted down to the snd_emu10k1_create() routine:

/* pseudo-code */
snd_emu10k1_create(...) {
...
request_irq(... IRQF_SHARED ...) {
register the irq handler
#ifdef CONFIG_DEBUG_SHIRQ
call the irq handler: snd_emu10k1_interrupt() {
poll I/O port // <---- !! system hangs
...
}
#endif
}
...
snd_emu10k1_cardbus_init(...) {
initialize I/O ports
}
...
}

The early access to I/O port in the interrupt handler causes
the freeze. Obviously it is necessary to init the I/O ports
before accessing them. This patch moves the registration of
the irq handler after the initialization of the I/O ports.

Signed-off-by: Jaroslav Franek <jarin.franek@post.cz>
Acked-by: James Courtier-Dutton <James@superbug.co.uk>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
---
sound/pci/emu10k1/emu10k1_main.c | 15 ++++++++-------
1 file changed, 8 insertions(+), 7 deletions(-)

--- a/sound/pci/emu10k1/emu10k1_main.c
+++ b/sound/pci/emu10k1/emu10k1_main.c
@@ -1817,13 +1817,6 @@ int __devinit snd_emu10k1_create(struct
}
emu->port = pci_resource_start(pci, 0);

- if (request_irq(pci->irq, snd_emu10k1_interrupt, IRQF_SHARED,
- "EMU10K1", emu)) {
- err = -EBUSY;
- goto error;
- }
- emu->irq = pci->irq;
-
emu->max_cache_pages = max_cache_bytes >> PAGE_SHIFT;
if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, snd_dma_pci_data(pci),
32 * 1024, &emu->ptb_pages) < 0) {
@@ -1886,6 +1879,14 @@ int __devinit snd_emu10k1_create(struct
emu->fx8010.etram_pages.area = NULL;
emu->fx8010.etram_pages.bytes = 0;

+ /* irq handler must be registered after I/O ports are activated */
+ if (request_irq(pci->irq, snd_emu10k1_interrupt, IRQF_SHARED,
+ "EMU10K1", emu)) {
+ err = -EBUSY;
+ goto error;
+ }
+ emu->irq = pci->irq;
+
/*
* Init to 0x02109204 :
* Clock accuracy = 0 (1000ppm)

--