Fixed MTP to work with TWRP

arch/m32r/lib/csum_partial_copy.c

@@ -0,0 +1,59 @@
+/*
+ * INET		An implementation of the TCP/IP protocol suite for the LINUX
+ *		operating system.  INET is implemented using the  BSD Socket
+ *		interface as the means of communication with the user level.
+ *
+ *		M32R specific IP/TCP/UDP checksumming routines
+ *		(Some code taken from MIPS architecture)
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1994, 1995  Waldorf Electronics GmbH
+ * Copyright (C) 1998, 1999  Ralf Baechle
+ * Copyright (C) 2001-2005  Hiroyuki Kondo, Hirokazu Takata
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/string.h>
+
+#include <net/checksum.h>
+#include <asm/byteorder.h>
+#include <asm/uaccess.h>
+
+/*
+ * Copy while checksumming, otherwise like csum_partial
+ */
+__wsum
+csum_partial_copy_nocheck (const void *src, void *dst, int len, __wsum sum)
+{
+	sum = csum_partial(src, len, sum);
+	memcpy(dst, src, len);
+
+	return sum;
+}
+EXPORT_SYMBOL(csum_partial_copy_nocheck);
+
+/*
+ * Copy from userspace and compute checksum.  If we catch an exception
+ * then zero the rest of the buffer.
+ */
+__wsum
+csum_partial_copy_from_user (const void __user *src, void *dst,
+			     int len, __wsum sum, int *err_ptr)
+{
+	int missing;
+
+	missing = copy_from_user(dst, src, len);
+	if (missing) {
+		memset(dst + len - missing, 0, missing);
+		*err_ptr = -EFAULT;
+	}
+
+	return csum_partial(dst, len-missing, sum);
+}
+EXPORT_SYMBOL(csum_partial_copy_from_user);
+EXPORT_SYMBOL(csum_partial);