zisofs use mutex instead of semaphore
Use mutex instead of semaphore in fs/isofs/compress.c, and remove an
unnecessary variable.
Signed-off-by: Dave Young <hidave.darkstar@gmail.com>
Acked-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/isofs/compress.c b/fs/isofs/compress.c
index 6bbbdb5..37dbd64 100644
--- a/fs/isofs/compress.c
+++ b/fs/isofs/compress.c
@@ -33,7 +33,7 @@
* allocation; this avoids failures at block-decompression time.
*/
static void *zisofs_zlib_workspace;
-static struct semaphore zisofs_zlib_semaphore;
+static DEFINE_MUTEX(zisofs_zlib_lock);
/*
* When decompressing, we typically obtain more than one page
@@ -180,9 +180,9 @@
/* First block is special since it may be fractional.
We also wait for it before grabbing the zlib
- semaphore; odds are that the subsequent blocks are
+ mutex; odds are that the subsequent blocks are
going to come in in short order so we don't hold
- the zlib semaphore longer than necessary. */
+ the zlib mutex longer than necessary. */
if ( !bh || (wait_on_buffer(bh), !buffer_uptodate(bh)) ) {
printk(KERN_DEBUG "zisofs: Hit null buffer, fpage = %d, xpage = %d, csize = %ld\n",
@@ -194,7 +194,7 @@
csize -= stream.avail_in;
stream.workspace = zisofs_zlib_workspace;
- down(&zisofs_zlib_semaphore);
+ mutex_lock(&zisofs_zlib_lock);
zerr = zlib_inflateInit(&stream);
if ( zerr != Z_OK ) {
@@ -281,7 +281,7 @@
zlib_inflateEnd(&stream);
z_eio:
- up(&zisofs_zlib_semaphore);
+ mutex_unlock(&zisofs_zlib_lock);
b_eio:
for ( i = 0 ; i < haveblocks ; i++ ) {
@@ -317,31 +317,16 @@
/* No bmap operation supported */
};
-static int initialized;
-
int __init zisofs_init(void)
{
- if ( initialized ) {
- printk("zisofs_init: called more than once\n");
- return 0;
- }
-
zisofs_zlib_workspace = vmalloc(zlib_inflate_workspacesize());
if ( !zisofs_zlib_workspace )
return -ENOMEM;
- init_MUTEX(&zisofs_zlib_semaphore);
- initialized = 1;
return 0;
}
void zisofs_cleanup(void)
{
- if ( !initialized ) {
- printk("zisofs_cleanup: called without initialization\n");
- return;
- }
-
vfree(zisofs_zlib_workspace);
- initialized = 0;
}