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);