mark memory pages used by transcoder as reserved

git-svn-id: http://svn.digium.com/svn/zaptel/trunk@1221 5390a7c7-147a-4af0-8ec9-7488f05a26cb

1 files changed, 20 insertions, 18 deletions

diff --git a/zttranscode.c b/zttranscode.c
index aa6bd3a..600ec58 100644
--- a/zttranscode.c
+++ b/zttranscode.c
@@ -171,28 +171,30 @@ static int zt_tc_open(struct inode *inode, struct file *file)
 {
 	struct zt_transcoder_channel *ztc;
 	struct zt_transcode_header *zth;
+	struct page *page;
 
-	ztc = kmalloc(sizeof(*ztc), GFP_KERNEL);
-	zth = kmalloc(sizeof(*zth), GFP_KERNEL | GFP_DMA);
-	
-	if (ztc && zth) {
-		memset(ztc, 0, sizeof(*ztc));
-		memset(zth, 0, sizeof(*zth));
-		ztc->flags = ZT_TC_FLAG_TRANSIENT|ZT_TC_FLAG_BUSY;
-		ztc->tch = zth;
-		if (debug)
-			printk("Allocated Transcoder Channel, header is at %p!\n", zth);
-		zth->magic = ZT_TRANSCODE_MAGIC;
-		file->private_data = ztc;
+	if (!(ztc = kmalloc(sizeof(*ztc), GFP_KERNEL)))
+		return -ENOMEM;
 
-		return 0;
+	if (!(zth = kmalloc(sizeof(*zth), GFP_KERNEL | GFP_DMA))) {
+		kfree(ztc);
+		return -ENOMEM;
 	}
+	
+	memset(ztc, 0, sizeof(*ztc));
+	memset(zth, 0, sizeof(*zth));
+	ztc->flags = ZT_TC_FLAG_TRANSIENT | ZT_TC_FLAG_BUSY;
+	ztc->tch = zth;
+	if (debug)
+		printk("Allocated Transcoder Channel, header is at %p!\n", zth);
+	zth->magic = ZT_TRANSCODE_MAGIC;
+	file->private_data = ztc;
+	for (page = virt_to_page(zth);
+	     page < virt_to_page((unsigned long) zth + sizeof(*zth));
+	     page++)
+		SetPageReserved(page);
 
-	if (ztc)
-		kfree(ztc);
-	if (zth)
-		kfree(zth);
-	return -ENOMEM;
+	return 0;
 }
 
 static void ztc_release(struct zt_transcoder_channel *ztc)