From 5aac27e4891af7edd7132a8f5461ec9ddeb0acab Mon Sep 17 00:00:00 2001
From: Shaun Ruffell <sruffell@digium.com>
Date: Fri, 11 Dec 2009 23:20:35 +0000
Subject: Merged revisions 7681 via svnmerge from
 https://origsvn.digium.com/svn/dahdi/linux/trunk

........
  r7681 | sruffell | 2009-12-11 17:20:02 -0600 (Fri, 11 Dec 2009) | 6 lines

  dahdi-base: Reduce the max allocation size in dahdi_reallocbufs.

  Lower the maximum contiguous chunk that DAHDI asks for from
  DAHDI_MAX_BUFFER_SIZE*2 to DAHDI_MAX_BUFFER_SIZE. With 4K pages, this can allow
  the kernel to try a little harder to find the memory it needs since the request
  goes from order 4 to order 3.
........


git-svn-id: http://svn.asterisk.org/svn/dahdi/linux/branches/2.2@7683 a0bf4364-ded3-4de4-8d8a-66a801d63aff
---
 drivers/dahdi/dahdi-base.c | 40 +++++++++++++++++++++++++---------------
 1 file changed, 25 insertions(+), 15 deletions(-)

diff --git a/drivers/dahdi/dahdi-base.c b/drivers/dahdi/dahdi-base.c
index 6ab8636..478bd64 100644
--- a/drivers/dahdi/dahdi-base.c
+++ b/drivers/dahdi/dahdi-base.c
@@ -897,9 +897,12 @@ static inline void calc_fcs(struct dahdi_chan *ss, int inwritebuf)
 	data[len - 1] = (fcs >> 8) & 0xff;
 }
 
-static int dahdi_reallocbufs(struct dahdi_chan *ss, int j, int numbufs)
+static int dahdi_reallocbufs(struct dahdi_chan *ss, int blocksize, int numbufs)
 {
-	unsigned char *newbuf, *oldbuf;
+	unsigned char *newtxbuf = NULL;
+	unsigned char *newrxbuf = NULL;
+	unsigned char *oldtxbuf = NULL;
+	unsigned char *oldrxbuf = NULL;
 	unsigned long flags;
 	int x;
 
@@ -911,25 +914,32 @@ static int dahdi_reallocbufs(struct dahdi_chan *ss, int j, int numbufs)
 		numbufs = DAHDI_MAX_NUM_BUFS;
 
 	/* We need to allocate our buffers now */
-	if (j) {
-		if (!(newbuf = kcalloc(j * 2, numbufs, GFP_KERNEL)))
+	if (blocksize) {
+		newtxbuf = kzalloc(blocksize * numbufs, GFP_KERNEL);
+		if (NULL == newtxbuf)
 			return -ENOMEM;
-	} else
-		newbuf = NULL;
+		newrxbuf = kzalloc(blocksize * numbufs, GFP_KERNEL);
+		if (NULL == newrxbuf) {
+			kfree(newtxbuf);
+			return -ENOMEM;
+		}
+	}
 
-	/* Now that we've allocated our new buffer, we can safely
+	/* Now that we've allocated our new buffers, we can safely
  	   move things around... */
 
 	spin_lock_irqsave(&ss->lock, flags);
 
-	ss->blocksize = j; /* set the blocksize */
-	oldbuf = ss->readbuf[0]; /* Keep track of the old buffer */
+	ss->blocksize = blocksize; /* set the blocksize */
+	oldrxbuf = ss->readbuf[0]; /* Keep track of the old buffer */
+	oldtxbuf = ss->writebuf[0];
 	ss->readbuf[0] = NULL;
 
-	if (newbuf) {
+	if (newrxbuf) {
+		BUG_ON(NULL == newtxbuf);
 		for (x = 0; x < numbufs; x++) {
-			ss->readbuf[x] = newbuf + x * j;
-			ss->writebuf[x] = newbuf + (numbufs + x) * j;
+			ss->readbuf[x] = newrxbuf + x * blocksize;
+			ss->writebuf[x] = newtxbuf + x * blocksize;
 		}
 	} else {
 		for (x = 0; x < numbufs; x++) {
@@ -948,7 +958,7 @@ static int dahdi_reallocbufs(struct dahdi_chan *ss, int j, int numbufs)
 
 	/* Keep track of where our data goes (if it goes
 	   anywhere at all) */
-	if (newbuf) {
+	if (newrxbuf) {
 		ss->inreadbuf = 0;
 		ss->inwritebuf = 0;
 	} else {
@@ -972,8 +982,8 @@ static int dahdi_reallocbufs(struct dahdi_chan *ss, int j, int numbufs)
 
 	spin_unlock_irqrestore(&ss->lock, flags);
 
-	if (oldbuf)
-		kfree(oldbuf);
+	kfree(oldtxbuf);
+	kfree(oldrxbuf);
 
 	return 0;
 }
-- 
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