sound: autoconvert trivial BKL users to private mutex

The usage of the BKL in the OSS sound drivers is
trivial, and each of them only locks against itself,
so it can be turned into per-driver mutexes.

This is the script that was used for the conversion:

file=$1
name=$2
if grep -q lock_kernel ${file} ; then
    if grep -q 'include.*linux.mutex.h' ${file} ; then
            sed -i '/include.*<linux\/smp_lock.h>/d' ${file}
    else
            sed -i 's/include.*<linux\/smp_lock.h>.*$/include <linux\/mutex.h>/g' ${file}
    fi
    sed -i ${file} \
        -e "/^#include.*linux.mutex.h/,$ {
                1,/^\(static\|int\|long\)/ {
                     /^\(static\|int\|long\)/istatic DEFINE_MUTEX(${name}_mutex);

} }"  \
    -e "s/\(un\)*lock_kernel\>[ ]*()/mutex_\1lock(\&${name}_mutex)/g" \
    -e '/[      ]*cycle_kernel_lock();/d'
else
    sed -i -e '/include.*\<smp_lock.h\>/d' ${file}  \
                -e '/cycle_kernel_lock()/d'
fi

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 7 insertions, 6 deletions

diff --git a/sound/oss/sh_dac_audio.c b/sound/oss/sh_dac_audio.c
index 479e3025a8a..53bba16bf70 100644
--- a/sound/oss/sh_dac_audio.c
+++ b/sound/oss/sh_dac_audio.c
@@ -16,7 +16,7 @@
 #include <linux/slab.h>
 #include <linux/fs.h>
 #include <linux/sound.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/soundcard.h>
 #include <linux/interrupt.h>
 #include <linux/hrtimer.h>
@@ -34,6 +34,7 @@
 
 #define BUFFER_SIZE 48000
 
+static DEFINE_MUTEX(sh_dac_audio_mutex);
 static int rate;
 static int empty;
 static char *data_buffer, *buffer_begin, *buffer_end;
@@ -163,9 +164,9 @@ static long dac_audio_unlocked_ioctl(struct file *file, u_int cmd, u_long arg)
 {
 	int ret;
 
-	lock_kernel();
+	mutex_lock(&sh_dac_audio_mutex);
 	ret = dac_audio_ioctl(file, cmd, arg);
-	unlock_kernel();
+	mutex_unlock(&sh_dac_audio_mutex);
 
 	return ret;
 }
@@ -229,16 +230,16 @@ static int dac_audio_open(struct inode *inode, struct file *file)
 	if (file->f_mode & FMODE_READ)
 		return -ENODEV;
 
-	lock_kernel();
+	mutex_lock(&sh_dac_audio_mutex);
 	if (in_use) {
-		unlock_kernel();
+		mutex_unlock(&sh_dac_audio_mutex);
 		return -EBUSY;
 	}
 
 	in_use = 1;
 
 	dac_audio_start();
-	unlock_kernel();
+	mutex_unlock(&sh_dac_audio_mutex);
 	return 0;
 }