10 files changed, 30 insertions, 126 deletions

diff --git a/include/sound/hwdep.h b/include/sound/hwdep.h
index d9eea013c753..8c05e47a4090 100644
--- a/include/sound/hwdep.h
+++ b/include/sound/hwdep.h
@@ -27,18 +27,28 @@
 
 struct snd_hwdep;
 
+/* hwdep file ops; all ops can be NULL */
 struct snd_hwdep_ops {
-        long long (*llseek) (struct snd_hwdep *hw, struct file * file, long long offset, int orig);
-        long (*read) (struct snd_hwdep *hw, char __user *buf, long count, loff_t *offset);
-        long (*write) (struct snd_hwdep *hw, const char __user *buf, long count, loff_t *offset);
-        int (*open) (struct snd_hwdep * hw, struct file * file);
-        int (*release) (struct snd_hwdep *hw, struct file * file);
-        unsigned int (*poll) (struct snd_hwdep *hw, struct file * file, poll_table * wait);
-        int (*ioctl) (struct snd_hwdep *hw, struct file * file, unsigned int cmd, unsigned long arg);
-        int (*ioctl_compat) (struct snd_hwdep *hw, struct file * file, unsigned int cmd, unsigned long arg);
-        int (*mmap) (struct snd_hwdep *hw, struct file * file, struct vm_area_struct * vma);
-        int (*dsp_status) (struct snd_hwdep *hw, struct snd_hwdep_dsp_status *status);
-        int (*dsp_load) (struct snd_hwdep *hw, struct snd_hwdep_dsp_image *image);
+        long long (*llseek)(struct snd_hwdep *hw, struct file *file,
+                            long long offset, int orig);
+        long (*read)(struct snd_hwdep *hw, char __user *buf,
+                     long count, loff_t *offset);
+        long (*write)(struct snd_hwdep *hw, const char __user *buf,
+                      long count, loff_t *offset);
+        int (*open)(struct snd_hwdep *hw, struct file * file);
+        int (*release)(struct snd_hwdep *hw, struct file * file);
+        unsigned int (*poll)(struct snd_hwdep *hw, struct file *file,
+                             poll_table *wait);
+        int (*ioctl)(struct snd_hwdep *hw, struct file *file,
+                     unsigned int cmd, unsigned long arg);
+        int (*ioctl_compat)(struct snd_hwdep *hw, struct file *file,
+                            unsigned int cmd, unsigned long arg);
+        int (*mmap)(struct snd_hwdep *hw, struct file *file,
+                    struct vm_area_struct *vma);
+        int (*dsp_status)(struct snd_hwdep *hw,
+                          struct snd_hwdep_dsp_status *status);
+        int (*dsp_load)(struct snd_hwdep *hw,
+                        struct snd_hwdep_dsp_image *image);
 };
 
 struct snd_hwdep {
@@ -61,9 +71,9 @@ struct snd_hwdep {
         void (*private_free) (struct snd_hwdep *hwdep);
 
         struct mutex open_mutex;
-        int used;
-        unsigned int dsp_loaded;
-        unsigned int exclusive: 1;
+        int used;                       /* reference counter */
+        unsigned int dsp_loaded;        /* bit fields of loaded dsp indices */
+        unsigned int exclusive:1;       /* exclusive access mode */
 };
 
 extern int snd_hwdep_new(struct snd_card *card, char *id, int device,
diff --git a/sound/core/hwdep.c b/sound/core/hwdep.c
index 195cafc5a553..a70ee7f1ed98 100644
--- a/sound/core/hwdep.c
+++ b/sound/core/hwdep.c
@@ -99,9 +99,6 @@ static int snd_hwdep_open(struct inode *inode, struct file * file)
         if (hw == NULL)
                 return -ENODEV;
 
-        if (!hw->ops.open)
-                return -ENXIO;
-
         if (!try_module_get(hw->card->module))
                 return -EFAULT;
 
@@ -113,6 +110,10 @@ static int snd_hwdep_open(struct inode *inode, struct file * file)
                         err = -EBUSY;
                         break;
                 }
+                if (!hw->ops.open) {
+                        err = 0;
+                        break;
+                }
                 err = hw->ops.open(hw, file);
                 if (err >= 0)
                         break;
@@ -151,7 +152,7 @@ static int snd_hwdep_open(struct inode *inode, struct file * file)
 
 static int snd_hwdep_release(struct inode *inode, struct file * file)
 {
-        int err = -ENXIO;
+        int err = 0;
         struct snd_hwdep *hw = file->private_data;
         struct module *mod = hw->card->module;
 
diff --git a/sound/drivers/vx/vx_hwdep.c b/sound/drivers/vx/vx_hwdep.c
index 8d6362e2d4c9..46df8817c18f 100644
--- a/sound/drivers/vx/vx_hwdep.c
+++ b/sound/drivers/vx/vx_hwdep.c
@@ -119,16 +119,6 @@ void snd_vx_free_firmware(struct vx_core *chip)
 
 #else /* old style firmware loading */
 
-static int vx_hwdep_open(struct snd_hwdep *hw, struct file *file)
-{
-        return 0;
-}
-
-static int vx_hwdep_release(struct snd_hwdep *hw, struct file *file)
-{
-        return 0;
-}
-
 static int vx_hwdep_dsp_status(struct snd_hwdep *hw,
                                struct snd_hwdep_dsp_status *info)
 {
@@ -243,8 +233,6 @@ int snd_vx_setup_firmware(struct vx_core *chip)
 
         hw->iface = SNDRV_HWDEP_IFACE_VX;
         hw->private_data = chip;
-        hw->ops.open = vx_hwdep_open;
-        hw->ops.release = vx_hwdep_release;
         hw->ops.dsp_status = vx_hwdep_dsp_status;
         hw->ops.dsp_load = vx_hwdep_dsp_load;
         hw->exclusive = 1;
diff --git a/sound/pci/mixart/mixart_hwdep.c b/sound/pci/mixart/mixart_hwdep.c
index 3782b52bc0e8..fa4de985fc4c 100644
--- a/sound/pci/mixart/mixart_hwdep.c
+++ b/sound/pci/mixart/mixart_hwdep.c
@@ -581,16 +581,6 @@ MODULE_FIRMWARE("mixart/miXart8AES.xlx");
 /* miXart hwdep interface id string */
 #define SND_MIXART_HWDEP_ID       "miXart Loader"
 
-static int mixart_hwdep_open(struct snd_hwdep *hw, struct file *file)
-{
-        return 0;
-}
-
-static int mixart_hwdep_release(struct snd_hwdep *hw, struct file *file)
-{
-        return 0;
-}
-
 static int mixart_hwdep_dsp_status(struct snd_hwdep *hw,
                                    struct snd_hwdep_dsp_status *info)
 {
@@ -643,8 +633,6 @@ int snd_mixart_setup_firmware(struct mixart_mgr *mgr)
 
         hw->iface = SNDRV_HWDEP_IFACE_MIXART;
         hw->private_data = mgr;
-        hw->ops.open = mixart_hwdep_open;
-        hw->ops.release = mixart_hwdep_release;
         hw->ops.dsp_status = mixart_hwdep_dsp_status;
         hw->ops.dsp_load = mixart_hwdep_dsp_load;
         hw->exclusive = 1;
diff --git a/sound/pci/pcxhr/pcxhr_hwdep.c b/sound/pci/pcxhr/pcxhr_hwdep.c
index 592743a298b0..17cb1233a903 100644
--- a/sound/pci/pcxhr/pcxhr_hwdep.c
+++ b/sound/pci/pcxhr/pcxhr_hwdep.c
@@ -471,16 +471,6 @@ static int pcxhr_hwdep_dsp_load(struct snd_hwdep *hw,
         return 0;
 }
 
-static int pcxhr_hwdep_open(struct snd_hwdep *hw, struct file *file)
-{
-        return 0;
-}
-
-static int pcxhr_hwdep_release(struct snd_hwdep *hw, struct file *file)
-{
-        return 0;
-}
-
 int pcxhr_setup_firmware(struct pcxhr_mgr *mgr)
 {
         int err;
@@ -495,8 +485,6 @@ int pcxhr_setup_firmware(struct pcxhr_mgr *mgr)
 
         hw->iface = SNDRV_HWDEP_IFACE_PCXHR;
         hw->private_data = mgr;
-        hw->ops.open = pcxhr_hwdep_open;
-        hw->ops.release = pcxhr_hwdep_release;
         hw->ops.dsp_status = pcxhr_hwdep_dsp_status;
         hw->ops.dsp_load = pcxhr_hwdep_dsp_load;
         hw->exclusive = 1;
diff --git a/sound/pci/rme9652/hdsp.c b/sound/pci/rme9652/hdsp.c
index 05b3f795a168..bacfdd12619b 100644
--- a/sound/pci/rme9652/hdsp.c
+++ b/sound/pci/rme9652/hdsp.c
@@ -4413,13 +4413,6 @@ static int snd_hdsp_capture_release(struct snd_pcm_substream *substream)
         return 0;
 }
 
-static int snd_hdsp_hwdep_dummy_op(struct snd_hwdep *hw, struct file *file)
-{
-        /* we have nothing to initialize but the call is required */
-        return 0;
-}
-
-
 /* helper functions for copying meter values */
 static inline int copy_u32_le(void __user *dest, void __iomem *src)
 {
@@ -4738,9 +4731,7 @@ static int snd_hdsp_create_hwdep(struct snd_card *card, struct hdsp *hdsp)
         hw->private_data = hdsp;
         strcpy(hw->name, "HDSP hwdep interface");
 
-        hw->ops.open = snd_hdsp_hwdep_dummy_op;
         hw->ops.ioctl = snd_hdsp_hwdep_ioctl;
-        hw->ops.release = snd_hdsp_hwdep_dummy_op;
                 
         return 0;
 }
diff --git a/sound/pci/rme9652/hdspm.c b/sound/pci/rme9652/hdspm.c
index d4b4e0d0fee8..bac2dc0c5d85 100644
--- a/sound/pci/rme9652/hdspm.c
+++ b/sound/pci/rme9652/hdspm.c
@@ -4100,13 +4100,6 @@ static int snd_hdspm_capture_release(struct snd_pcm_substream *substream)
         return 0;
 }
 
-static int snd_hdspm_hwdep_dummy_op(struct snd_hwdep * hw, struct file *file)
-{
-        /* we have nothing to initialize but the call is required */
-        return 0;
-}
-
-
 static int snd_hdspm_hwdep_ioctl(struct snd_hwdep * hw, struct file *file,
                                  unsigned int cmd, unsigned long arg)
 {
@@ -4213,9 +4206,7 @@ static int __devinit snd_hdspm_create_hwdep(struct snd_card *card,
         hw->private_data = hdspm;
         strcpy(hw->name, "HDSPM hwdep interface");
 
-        hw->ops.open = snd_hdspm_hwdep_dummy_op;
         hw->ops.ioctl = snd_hdspm_hwdep_ioctl;
-        hw->ops.release = snd_hdspm_hwdep_dummy_op;
 
         return 0;
 }
diff --git a/sound/synth/emux/emux_hwdep.c b/sound/synth/emux/emux_hwdep.c
index 0a5391436add..ff0b2a8fd25b 100644
--- a/sound/synth/emux/emux_hwdep.c
+++ b/sound/synth/emux/emux_hwdep.c
@@ -24,25 +24,6 @@
 #include <asm/uaccess.h>
 #include "emux_voice.h"
 
-/*
- * open the hwdep device
- */
-static int
-snd_emux_hwdep_open(struct snd_hwdep *hw, struct file *file)
-{
-        return 0;
-}
-
-
-/*
- * close the device
- */
-static int
-snd_emux_hwdep_release(struct snd_hwdep *hw, struct file *file)
-{
-        return 0;
-}
-
 
 #define TMP_CLIENT_ID   0x1001
 
@@ -146,8 +127,6 @@ snd_emux_init_hwdep(struct snd_emux *emu)
         emu->hwdep = hw;
         strcpy(hw->name, SNDRV_EMUX_HWDEP_NAME);
         hw->iface = SNDRV_HWDEP_IFACE_EMUX_WAVETABLE;
-        hw->ops.open = snd_emux_hwdep_open;
-        hw->ops.release = snd_emux_hwdep_release;
         hw->ops.ioctl = snd_emux_hwdep_ioctl;
         hw->exclusive = 1;
         hw->private_data = emu;
diff --git a/sound/usb/usbmixer.c b/sound/usb/usbmixer.c
index 00397c8a765b..2bde79216fa5 100644
--- a/sound/usb/usbmixer.c
+++ b/sound/usb/usbmixer.c
@@ -78,7 +78,6 @@ struct usb_mixer_interface {
 
         /* Sound Blaster remote control stuff */
         const struct rc_config *rc_cfg;
-        unsigned long rc_hwdep_open;
         u32 rc_code;
         wait_queue_head_t rc_waitq;
         struct urb *rc_urb;
@@ -1797,24 +1796,6 @@ static void snd_usb_soundblaster_remote_complete(struct urb *urb)
         wake_up(&mixer->rc_waitq);
 }
 
-static int snd_usb_sbrc_hwdep_open(struct snd_hwdep *hw, struct file *file)
-{
-        struct usb_mixer_interface *mixer = hw->private_data;
-
-        if (test_and_set_bit(0, &mixer->rc_hwdep_open))
-                return -EBUSY;
-        return 0;
-}
-
-static int snd_usb_sbrc_hwdep_release(struct snd_hwdep *hw, struct file *file)
-{
-        struct usb_mixer_interface *mixer = hw->private_data;
-
-        clear_bit(0, &mixer->rc_hwdep_open);
-        smp_mb__after_clear_bit();
-        return 0;
-}
-
 static long snd_usb_sbrc_hwdep_read(struct snd_hwdep *hw, char __user *buf,
                                      long count, loff_t *offset)
 {
@@ -1867,9 +1848,8 @@ static int snd_usb_soundblaster_remote_init(struct usb_mixer_interface *mixer)
         hwdep->iface = SNDRV_HWDEP_IFACE_SB_RC;
         hwdep->private_data = mixer;
         hwdep->ops.read = snd_usb_sbrc_hwdep_read;
-        hwdep->ops.open = snd_usb_sbrc_hwdep_open;
-        hwdep->ops.release = snd_usb_sbrc_hwdep_release;
         hwdep->ops.poll = snd_usb_sbrc_hwdep_poll;
+        hwdep->exclusive = 1;
 
         mixer->rc_urb = usb_alloc_urb(0, GFP_KERNEL);
         if (!mixer->rc_urb)
diff --git a/sound/usb/usx2y/usX2Yhwdep.c b/sound/usb/usx2y/usX2Yhwdep.c
index 1558a5c4094f..a26d8d83d3eb 100644
--- a/sound/usb/usx2y/usX2Yhwdep.c
+++ b/sound/usb/usx2y/usX2Yhwdep.c
@@ -106,16 +106,6 @@ static unsigned int snd_us428ctls_poll(struct snd_hwdep *hw, struct file *file,
 }
 
 
-static int snd_usX2Y_hwdep_open(struct snd_hwdep *hw, struct file *file)
-{
-        return 0;
-}
-
-static int snd_usX2Y_hwdep_release(struct snd_hwdep *hw, struct file *file)
-{
-        return 0;
-}
-
 static int snd_usX2Y_hwdep_dsp_status(struct snd_hwdep *hw,
                                       struct snd_hwdep_dsp_status *info)
 {
@@ -267,8 +257,6 @@ int usX2Y_hwdep_new(struct snd_card *card, struct usb_device* device)
 
         hw->iface = SNDRV_HWDEP_IFACE_USX2Y;
         hw->private_data = usX2Y(card);
-        hw->ops.open = snd_usX2Y_hwdep_open;
-        hw->ops.release = snd_usX2Y_hwdep_release;
         hw->ops.dsp_status = snd_usX2Y_hwdep_dsp_status;
         hw->ops.dsp_load = snd_usX2Y_hwdep_dsp_load;
         hw->ops.mmap = snd_us428ctls_mmap;