4 Jun
2009
4 Jun
'09
7:29 a.m.
At Thu, 4 Jun 2009 07:48:47 +0400, The Source wrote:
2009/6/2 Takashi Iwai tiwai@suse.de
At Mon, 1 Jun 2009 21:47:02 -0400, Lee Revell wrote: > > On Mon, Jun 1, 2009 at 5:10 AM, Takashi Iwai <tiwai@suse.de> wrote: > > Thanks. So, something wrong in the mmap handling. > > I'll take a look later in this week. > > Looks like ct_map_audio_buffer calls ct_vm_map under spinlock; > ct_vm_map calls get_vm_block which calls kzalloc with GFP_KERNEL. Indeed. Does the patch below fix the problem? thanks, Takashi --- diff --git a/sound/pci/ctxfi/ctatc.c b/sound/pci/ctxfi/ctatc.c index ead104e..1a4bb35 100644 --- a/sound/pci/ctxfi/ctatc.c +++ b/sound/pci/ctxfi/ctatc.c @@ -119,7 +119,6 @@ atc_pcm_release_resources(struct ct_atc *atc, struct ct_atc_pcm *apcm); static int ct_map_audio_buffer(struct ct_atc *atc, struct ct_atc_pcm *apcm) { - unsigned long flags; struct snd_pcm_runtime *runtime; struct ct_vm *vm; @@ -129,9 +128,7 @@ static int ct_map_audio_buffer(struct ct_atc *atc, struct ct_atc_pcm *apcm) runtime = apcm->substream->runtime; vm = atc->vm; - spin_lock_irqsave(&atc->vm_lock, flags); apcm->vm_block = vm->map(vm, runtime->dma_area, runtime-> dma_bytes); - spin_unlock_irqrestore(&atc->vm_lock, flags); if (NULL == apcm->vm_block) return -ENOENT; @@ -141,7 +138,6 @@ static int ct_map_audio_buffer(struct ct_atc *atc, struct ct_atc_pcm *apcm) static void ct_unmap_audio_buffer(struct ct_atc *atc, struct ct_atc_pcm *apcm) { - unsigned long flags; struct ct_vm *vm; if (NULL == apcm->vm_block) @@ -149,9 +145,7 @@ static void ct_unmap_audio_buffer(struct ct_atc *atc, struct ct_atc_pcm *apcm) vm = atc->vm; - spin_lock_irqsave(&atc->vm_lock, flags); vm->unmap(vm, apcm->vm_block); - spin_unlock_irqrestore(&atc->vm_lock, flags); apcm->vm_block = NULL; } @@ -161,9 +155,7 @@ static unsigned long atc_get_ptp_phys(struct ct_atc *atc, int index) struct ct_vm *vm; void *kvirt_addr; unsigned long phys_addr; - unsigned long flags; - spin_lock_irqsave(&atc->vm_lock, flags); vm = atc->vm; kvirt_addr = vm->get_ptp_virt(vm, index); if (kvirt_addr == NULL) @@ -171,8 +163,6 @@ static unsigned long atc_get_ptp_phys(struct ct_atc *atc, int index) else phys_addr = virt_to_phys(kvirt_addr); - spin_unlock_irqrestore(&atc->vm_lock, flags); - return phys_addr; } @@ -1562,7 +1552,6 @@ int ct_atc_create(struct snd_card *card, struct pci_dev *pci, atc_set_ops(atc); spin_lock_init(&atc->atc_lock); - spin_lock_init(&atc->vm_lock); /* Find card model */ err = atc_identify_card(atc); diff --git a/sound/pci/ctxfi/ctatc.h b/sound/pci/ctxfi/ctatc.h index 286c993..a7b0ec2 100644 --- a/sound/pci/ctxfi/ctatc.h +++ b/sound/pci/ctxfi/ctatc.h @@ -101,7 +101,6 @@ struct ct_atc { unsigned long (*get_ptp_phys)(struct ct_atc *atc, int index); spinlock_t atc_lock; - spinlock_t vm_lock; int (*pcm_playback_prepare)(struct ct_atc *atc, struct ct_atc_pcm *apcm); diff --git a/sound/pci/ctxfi/ctvmem.c b/sound/pci/ctxfi/ctvmem.c index cecf77e..363b67e 100644 --- a/sound/pci/ctxfi/ctvmem.c +++ b/sound/pci/ctxfi/ctvmem.c @@ -35,25 +35,27 @@ get_vm_block(struct ct_vm *vm, unsigned int size) struct ct_vm_block *block = NULL, *entry = NULL; struct list_head *pos = NULL; + mutex_lock(&vm->lock); list_for_each(pos, &vm->unused) { entry = list_entry(pos, struct ct_vm_block, list); if (entry->size >= size) break; /* found a block that is big enough */ } if (pos == &vm->unused) - return NULL; + goto out; if (entry->size == size) { /* Move the vm node from unused list to used list directly */ list_del(&entry->list); list_add(&entry->list, &vm->used); vm->size -= size; - return entry; + block = entry; + goto out; } block = kzalloc(sizeof(*block), GFP_KERNEL); if (NULL == block) - return NULL; + goto out; block->addr = entry->addr; block->size = size; @@ -62,6 +64,8 @@ get_vm_block(struct ct_vm *vm, unsigned int size) entry->size -= size; vm->size -= size; + out: + mutex_unlock(&vm->lock); return block; } @@ -70,6 +74,7 @@ static void put_vm_block(struct ct_vm *vm, struct ct_vm_block *block) struct ct_vm_block *entry = NULL, *pre_ent = NULL; struct list_head *pos = NULL, *pre = NULL; + mutex_lock(&vm->lock); list_del(&block->list); vm->size += block->size; @@ -106,6 +111,7 @@ static void put_vm_block(struct ct_vm *vm, struct ct_vm_block *block) pos = pre; pre = pos->prev; } + mutex_unlock(&vm->lock); } /* Map host addr (kmalloced/vmalloced) to device logical addr. */ @@ -191,6 +197,8 @@ int ct_vm_create(struct ct_vm **rvm) if (NULL == vm) return -ENOMEM; + mutex_init(&vm->lock); + /* Allocate page table pages */ for (i = 0; i < CT_PTP_NUM; i++) { vm->ptp[i] = kmalloc(PAGE_SIZE, GFP_KERNEL); diff --git a/sound/pci/ctxfi/ctvmem.h b/sound/pci/ctxfi/ctvmem.h index 4eb5bdd..618952e 100644 --- a/sound/pci/ctxfi/ctvmem.h +++ b/sound/pci/ctxfi/ctvmem.h @@ -20,7 +20,7 @@ #define CT_PTP_NUM 1 /* num of device page table pages */ -#include <linux/spinlock.h> +#include <linux/mutex.h> #include <linux/list.h> struct ct_vm_block { @@ -35,6 +35,7 @@ struct ct_vm { unsigned int size; /* Available addr space in bytes */ struct list_head unused; /* List of unused blocks */ struct list_head used; /* List of used blocks */ + struct mutex lock; /* Map host addr (kmalloced/vmalloced) to device logical addr. */ struct ct_vm_block *(*map)(struct ct_vm *, void *host_addr, int size);I tried this patch (actually I downloaded the snapshot yesterday and patch said it was already applied there), but my system can not boot at all with this driver. It prints 'starting udev' at that's it. I removed the driver and my system is back to normal.
Yes, yesterday's version had a severe bug in the core code. It's already fixed, so please use the later one.
Note that alsa-driver-snapshot.tar.gz is *always* the latest version, so pick this up instead of the daily snapshots for testing something.
thanks,
Takashi