[PATCHv2] isdn: reduce stack size of mISDN_dsp

[Frank Seidel <fseidel@suse.de>]

From: Frank Seidel <frank@f-seidel.de>

Reduce stack size memory footprint of mISDN_dsp.
(From 1468 bytes for dsp_cmx_send on i386 down
to 44).

Signed-off-by: Frank Seidel <frank@f-seidel.de>
---
 drivers/isdn/mISDN/dsp_cmx.c |   12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

--- a/drivers/isdn/mISDN/dsp_cmx.c
+++ b/drivers/isdn/mISDN/dsp_cmx.c
@@ -1592,13 +1592,21 @@ dsp_cmx_send(void *arg)
 	struct dsp_conf_member *member;
 	struct dsp *dsp;
 	int mustmix, members;
-	s32 mixbuffer[MAX_POLL+100], *c;
+	s32 *mixbuffer;
+	s32 *c;
 	u8 *p, *q;
 	int r, rr;
 	int jittercheck = 0, delay, i;
 	u_long flags;
 	u16 length, count;
 
+	mixbuffer = kmalloc(sizeof(*mixbuffer) * (MAX_POLL + 100), GFP_KERNEL);
+	if (!mixbuffer) {
+		printk(KERN_ERR "mISDN_dsp: cannot allocate buffer(%s)\n",
+		       __func__);
+		return;
+	}
+
 	/* lock */
 	spin_lock_irqsave(&dsp_lock, flags);
 
@@ -1811,6 +1819,8 @@ dsp_cmx_send(void *arg)
 
 	/* unlock */
 	spin_unlock_irqrestore(&dsp_lock, flags);
+
+	kfree(mixbuffer);
 }
 
 /*