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authorTakashi Iwai <tiwai@suse.de>2009-06-02 08:40:51 +0200
committerTakashi Iwai <tiwai@suse.de>2009-06-02 08:40:51 +0200
commit8a4259bf89d23bfd58d87e275ef6da29cea6b3c5 (patch)
treeee96ea01ae32a828f1446f52bd2534783e0c8dfd /sound/pci/ctxfi
parentaae80dc24aeddec4e2b6e182a43491942f8667d3 (diff)
ALSA: ctxfi - Fix Oops at mmapping
Replace a spinlock with a mutex protecting the vm block list at mmap / munmap calls, which caused Oops like below: BUG: sleeping function called from invalid context at mm/slub.c:1599 in_atomic(): 0, irqs_disabled(): 1, pid: 32065, name: xine Pid: 32065, comm: xine Tainted: P 2.6.29.4-75.fc10.x86_64 #1 Call Trace: [<ffffffff81040685>] __might_sleep+0x105/0x10a [<ffffffff810c9fae>] kmem_cache_alloc+0x32/0xe2 [<ffffffffa08e3110>] ct_vm_map+0xfa/0x19e [snd_ctxfi] [<ffffffffa08e1a07>] ct_map_audio_buffer+0x4c/0x76 [snd_ctxfi] [<ffffffffa08e2aa5>] atc_pcm_playback_prepare+0x1d7/0x2a8 [snd_ctxfi] [<ffffffff8105ef3f>] ? up_read+0x9/0xb [<ffffffff81186b61>] ? __up_read+0x7c/0x87 [<ffffffffa08e36a6>] ct_pcm_playback_prepare+0x39/0x60 [snd_ctxfi] [<ffffffffa0886bcb>] snd_pcm_do_prepare+0x16/0x28 [snd_pcm] [<ffffffffa08867c7>] snd_pcm_action_single+0x2d/0x5b [snd_pcm] [<ffffffffa08881f3>] snd_pcm_action_nonatomic+0x52/0x6a [snd_pcm] [<ffffffffa088a723>] snd_pcm_common_ioctl1+0x404/0xc79 [snd_pcm] [<ffffffff810c52c8>] ? alloc_pages_current+0xb9/0xc2 [<ffffffff810c9402>] ? new_slab+0x1a5/0x1cb [<ffffffff810ab9ea>] ? vma_prio_tree_insert+0x23/0xc1 [<ffffffffa088b411>] snd_pcm_playback_ioctl1+0x213/0x230 [snd_pcm] [<ffffffff810b6c20>] ? mmap_region+0x397/0x4c9 [<ffffffffa088bd9b>] snd_pcm_playback_ioctl+0x2e/0x36 [snd_pcm] [<ffffffff810ddc64>] vfs_ioctl+0x2a/0x78 [<ffffffff810de130>] do_vfs_ioctl+0x462/0x4a2 [<ffffffff81029cef>] ? default_spin_lock_flags+0x9/0xe [<ffffffff81374647>] ? trace_hardirqs_off_thunk+0x3a/0x6c [<ffffffff810de1c5>] sys_ioctl+0x55/0x77 [<ffffffff8101133a>] system_call_fastpath+0x16/0x1b Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/pci/ctxfi')
-rw-r--r--sound/pci/ctxfi/ctatc.c11
-rw-r--r--sound/pci/ctxfi/ctatc.h1
-rw-r--r--sound/pci/ctxfi/ctvmem.c14
-rw-r--r--sound/pci/ctxfi/ctvmem.h3
4 files changed, 13 insertions, 16 deletions
diff --git a/sound/pci/ctxfi/ctatc.c b/sound/pci/ctxfi/ctatc.c
index ead104ea1e3..1a4bb357eae 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 286c993d461..a7b0ec24cd7 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 cecf77e3ee8..363b67e3a9e 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 4eb5bdd5cad..618952efa5b 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);