diff --git a/drivers/net/wireless/brcm80211/brcmfmac/dhd.h b/drivers/net/wireless/brcm80211/brcmfmac/dhd.h
index 3ec7477..f58c0eb 100644
--- a/drivers/net/wireless/brcm80211/brcmfmac/dhd.h
+++ b/drivers/net/wireless/brcm80211/brcmfmac/dhd.h
@@ -720,7 +720,7 @@
 extern int brcmf_os_proto_block(struct brcmf_pub *drvr);
 extern int brcmf_os_proto_unblock(struct brcmf_pub *drvr);
 #ifdef BCMDBG
-extern int brcmf_write_to_file(struct brcmf_pub *drvr, u8 *buf, int size);
+extern int brcmf_write_to_file(struct brcmf_pub *drvr, const u8 *buf, int size);
 #endif				/* BCMDBG */
 
 extern int brcmf_ifname2idx(struct brcmf_info *drvr_priv, char *name);
diff --git a/drivers/net/wireless/brcm80211/brcmfmac/dhd_linux.c b/drivers/net/wireless/brcm80211/brcmfmac/dhd_linux.c
index 03607ca..aac6141 100644
--- a/drivers/net/wireless/brcm80211/brcmfmac/dhd_linux.c
+++ b/drivers/net/wireless/brcm80211/brcmfmac/dhd_linux.c
@@ -1318,7 +1318,7 @@
 }
 
 #ifdef BCMDBG
-int brcmf_write_to_file(struct brcmf_pub *drvr, u8 *buf, int size)
+int brcmf_write_to_file(struct brcmf_pub *drvr, const u8 *buf, int size)
 {
 	int ret = 0;
 	struct file *fp;
@@ -1338,7 +1338,7 @@
 	}
 
 	/* Write buf to file */
-	fp->f_op->write(fp, buf, size, &pos);
+	fp->f_op->write(fp, (char __user *)buf, size, &pos);
 
 exit:
 	/* free buf before return */