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Commit b1d5776d authored by Takashi Iwai's avatar Takashi Iwai Committed by Jaroslav Kysela
Browse files

[ALSA] Remove vmalloc wrapper, kfree_nocheck() 



- Remove vmalloc wrapper
- Add release_and_free_resource() to remove kfree_nocheck() from each driver
  and simplify the code

Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent 93f2e378

Documentation/sound/alsa/DocBook/writing-an-alsa-driver.tmpl

+1 −16
Original line number Diff line number Diff line
@@ -1433,25 +1433,10 @@ 
        <informalexample>

          <programlisting>

<![CDATA[

  if (chip->res_port) {

          release_resource(chip->res_port);

          kfree_nocheck(chip->res_port);

  }

  release_and_free_resource(chip->res_port);

]]>

          </programlisting>

        </informalexample>



      As you can see, the resource pointer is also to be freed

      via <function>kfree_nocheck()</function> after

      <function>release_resource()</function> is called. You

      cannot use <function>kfree()</function> here, because on ALSA,

      <function>kfree()</function> may be a wrapper to its own

      allocator with the memory debugging. Since the resource pointer

      is allocated externally outside the ALSA, it must be released

      via the native

      <function>kfree()</function>.

      <function>kfree_nocheck()</function> is used for that; it calls

      the native <function>kfree()</function> without wrapper. 

      </para>



      <para>

include/sound/core.h

+1 −8
Original line number Diff line number Diff line
@@ -293,19 +293,13 @@ void *snd_hidden_kmalloc(size_t size, gfp_t flags); 
void *snd_hidden_kzalloc(size_t size, gfp_t flags);

void *snd_hidden_kcalloc(size_t n, size_t size, gfp_t flags);

void snd_hidden_kfree(const void *obj);

void *snd_hidden_vmalloc(unsigned long size);

void snd_hidden_vfree(void *obj);

char *snd_hidden_kstrdup(const char *s, gfp_t flags);

#define kmalloc(size, flags) snd_hidden_kmalloc(size, flags)

#define kzalloc(size, flags) snd_hidden_kzalloc(size, flags)

#define kcalloc(n, size, flags) snd_hidden_kcalloc(n, size, flags)

#define kfree(obj) snd_hidden_kfree(obj)

#define vmalloc(size) snd_hidden_vmalloc(size)

#define vfree(obj) snd_hidden_vfree(obj)

#define kmalloc_nocheck(size, flags) snd_wrapper_kmalloc(size, flags)

#define vmalloc_nocheck(size) snd_wrapper_vmalloc(size)

#define kfree_nocheck(obj) snd_wrapper_kfree(obj)

#define vfree_nocheck(obj) snd_wrapper_vfree(obj)

#define kstrdup(s, flags)  snd_hidden_kstrdup(s, flags)

#else

#define snd_memory_init() /*NOP*/
@@ -313,9 +307,7 @@ char *snd_hidden_kstrdup(const char *s, gfp_t flags); 
#define snd_memory_info_init() /*NOP*/

#define snd_memory_info_done() /*NOP*/

#define kmalloc_nocheck(size, flags) kmalloc(size, flags)

#define vmalloc_nocheck(size) vmalloc(size)

#define kfree_nocheck(obj) kfree(obj)

#define vfree_nocheck(obj) vfree(obj)

#endif

int copy_to_user_fromio(void __user *dst, const volatile void __iomem *src, size_t count);

int copy_from_user_toio(volatile void __iomem *dst, const void __user *src, size_t count);
@@ -372,6 +364,7 @@ unsigned int snd_dma_pointer(unsigned long dma, unsigned int size); 
#endif



/* misc.c */

void release_and_free_resource(struct resource *res);



#ifdef CONFIG_SND_VERBOSE_PRINTK

void snd_verbose_printk(const char *file, int line, const char *format, ...)

include/sound/driver.h

+0 −4
Original line number Diff line number Diff line
@@ -55,10 +55,6 @@ void *snd_wrapper_kmalloc(size_t, gfp_t); 
#undef kmalloc

void snd_wrapper_kfree(const void *);

#undef kfree

void *snd_wrapper_vmalloc(size_t);

#undef vmalloc

void snd_wrapper_vfree(void *);

#undef vfree

#endif



#endif /* __SOUND_DRIVER_H */

sound/core/memory.c

+0 −53
Original line number Diff line number Diff line
@@ -47,19 +47,14 @@ struct snd_alloc_track { 
#define snd_alloc_track_entry(obj) (struct snd_alloc_track *)((char*)obj - (unsigned long)((struct snd_alloc_track *)0)->data)



static long snd_alloc_kmalloc;

static long snd_alloc_vmalloc;

static LIST_HEAD(snd_alloc_kmalloc_list);

static LIST_HEAD(snd_alloc_vmalloc_list);

static DEFINE_SPINLOCK(snd_alloc_kmalloc_lock);

static DEFINE_SPINLOCK(snd_alloc_vmalloc_lock);

#define KMALLOC_MAGIC 0x87654321

#define VMALLOC_MAGIC 0x87654320

static snd_info_entry_t *snd_memory_info_entry;



void __init snd_memory_init(void)

{

	snd_alloc_kmalloc = 0;

	snd_alloc_vmalloc = 0;

}



void snd_memory_done(void)
@@ -69,8 +64,6 @@ void snd_memory_done(void) 


	if (snd_alloc_kmalloc > 0)

		snd_printk(KERN_ERR "Not freed snd_alloc_kmalloc = %li\n", snd_alloc_kmalloc);

	if (snd_alloc_vmalloc > 0)

		snd_printk(KERN_ERR "Not freed snd_alloc_vmalloc = %li\n", snd_alloc_vmalloc);

	list_for_each_prev(head, &snd_alloc_kmalloc_list) {

		t = list_entry(head, struct snd_alloc_track, list);

		if (t->magic != KMALLOC_MAGIC) {
@@ -79,14 +72,6 @@ void snd_memory_done(void) 
		}

		snd_printk(KERN_ERR "kmalloc(%ld) from %p not freed\n", (long) t->size, t->caller);

	}

	list_for_each_prev(head, &snd_alloc_vmalloc_list) {

		t = list_entry(head, struct snd_alloc_track, list);

		if (t->magic != VMALLOC_MAGIC) {

			snd_printk(KERN_ERR "Corrupted vmalloc\n");

			break;

		}

		snd_printk(KERN_ERR "vmalloc(%ld) from %p not freed\n", (long) t->size, t->caller);

	}

}



static void *__snd_kmalloc(size_t size, gfp_t flags, void *caller)
@@ -153,43 +138,6 @@ void snd_hidden_kfree(const void *obj) 
	snd_wrapper_kfree(obj);

}



void *snd_hidden_vmalloc(unsigned long size)

{

	void *ptr;

	ptr = snd_wrapper_vmalloc(size + sizeof(struct snd_alloc_track));

	if (ptr) {

		struct snd_alloc_track *t = (struct snd_alloc_track *)ptr;

		t->magic = VMALLOC_MAGIC;

		t->caller = __builtin_return_address(0);

		spin_lock(&snd_alloc_vmalloc_lock);

		list_add_tail(&t->list, &snd_alloc_vmalloc_list);

		spin_unlock(&snd_alloc_vmalloc_lock);

		t->size = size;

		snd_alloc_vmalloc += size;

		ptr = t->data;

	}

	return ptr;

}



void snd_hidden_vfree(void *obj)

{

	struct snd_alloc_track *t;

	if (obj == NULL)

		return;

	t = snd_alloc_track_entry(obj);

	if (t->magic != VMALLOC_MAGIC) {

		snd_printk(KERN_ERR "bad vfree (called from %p)\n", __builtin_return_address(0));

		return;

	}

	spin_lock(&snd_alloc_vmalloc_lock);

	list_del(&t->list);

	spin_unlock(&snd_alloc_vmalloc_lock);

	t->magic = 0;

	snd_alloc_vmalloc -= t->size;

	obj = t;

	snd_wrapper_vfree(obj);

}



char *snd_hidden_kstrdup(const char *s, gfp_t flags)

{

	int len;
@@ -207,7 +155,6 @@ char *snd_hidden_kstrdup(const char *s, gfp_t flags) 
static void snd_memory_info_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer)

{

	snd_iprintf(buffer, "kmalloc: %li bytes\n", snd_alloc_kmalloc);

	snd_iprintf(buffer, "vmalloc: %li bytes\n", snd_alloc_vmalloc);

}



int __init snd_memory_info_init(void)

sound/core/misc.c

+9 −0
Original line number Diff line number Diff line
@@ -23,8 +23,17 @@ 
#include <linux/init.h>

#include <linux/sched.h>

#include <linux/time.h>

#include <linux/ioport.h>

#include <sound/core.h>



void release_and_free_resource(struct resource *res)

{

	if (res) {

		release_resource(res);

		kfree_nocheck(res);

	}

}



#ifdef CONFIG_SND_VERBOSE_PRINTK

void snd_verbose_printk(const char *file, int line, const char *format, ...)

{