Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=a36a151e79be1562d6fea3ec4698f23e7102a26f
Commit:     a36a151e79be1562d6fea3ec4698f23e7102a26f
Parent:     040b5c6f9503f2d6b35c335f8537bb3035d35547
Author:     Dave Young <[EMAIL PROTECTED]>
AuthorDate: Tue Oct 16 23:26:10 2007 -0700
Committer:  Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Wed Oct 17 08:42:47 2007 -0700

    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 <[EMAIL PROTECTED]>
    Acked-by: H. Peter Anvin <[EMAIL PROTECTED]>
    Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
    Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
 fs/isofs/compress.c |   25 +++++--------------------
 1 files changed, 5 insertions(+), 20 deletions(-)

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 @@ static char zisofs_sink_page[PAGE_CACHE_SIZE];
  * 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 @@ static int zisofs_readpage(struct file *file, struct page 
*page)
 
                /* 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 @@ static int zisofs_readpage(struct file *file, struct page 
*page)
                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 @@ static int zisofs_readpage(struct file *file, struct page 
*page)
                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 @@ const struct address_space_operations zisofs_aops = {
        /* 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;
 }
-
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