change otg to host mode

hc

2024-05-11 04dd17822334871b23ea2862f7798fb0e0007777

 kernel/arch/powerpc/lib/checksum_wrappers.c
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..
@@ -1,17 +1,5 @@
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+// SPDX-License-Identifier: GPL-2.0-or-later
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 /*
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License as published by
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- * the Free Software Foundation; either version 2 of the License, or
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- * (at your option) any later version.
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- *
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- * This program is distributed in the hope that it will be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- * GNU General Public License for more details.
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- *
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- * You should have received a copy of the GNU General Public License
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- * along with this program; if not, write to the Free Software
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- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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  *
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  * Copyright (C) IBM Corporation, 2010
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  *
..
..
@@ -24,83 +12,37 @@
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12
 #include <linux/uaccess.h>
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13
 
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 __wsum csum_and_copy_from_user(const void __user *src, void *dst,
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-			       int len, __wsum sum, int *err_ptr)
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+			       int len)
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 {
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-	unsigned int csum;
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+	__wsum csum;
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 	might_sleep();
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+
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+	if (unlikely(!access_ok(src, len)))
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+		return 0;
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+
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 	allow_read_from_user(src, len);
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-	*err_ptr = 0;
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+	csum = csum_partial_copy_generic((void __force *)src, dst, len);
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-	if (!len) {
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-		csum = 0;
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-		goto out;
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-	}
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-
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-	if (unlikely((len < 0) || !access_ok(VERIFY_READ, src, len))) {
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-		*err_ptr = -EFAULT;
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-		csum = (__force unsigned int)sum;
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-		goto out;
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-	}
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-
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-	csum = csum_partial_copy_generic((void __force *)src, dst,
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-					 len, sum, err_ptr, NULL);
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-
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-	if (unlikely(*err_ptr)) {
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-		int missing = __copy_from_user(dst, src, len);
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-
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-		if (missing) {
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-			memset(dst + len - missing, 0, missing);
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-			*err_ptr = -EFAULT;
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-		} else {
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-			*err_ptr = 0;
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-		}
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-
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-		csum = csum_partial(dst, len, sum);
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-	}
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-
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-out:
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 	prevent_read_from_user(src, len);
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-	return (__force __wsum)csum;
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+	return csum;
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 }
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 EXPORT_SYMBOL(csum_and_copy_from_user);
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32
 
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-__wsum csum_and_copy_to_user(const void *src, void __user *dst, int len,
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-			     __wsum sum, int *err_ptr)
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+__wsum csum_and_copy_to_user(const void *src, void __user *dst, int len)
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 {
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-	unsigned int csum;
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+	__wsum csum;
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36
 
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 	might_sleep();
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+	if (unlikely(!access_ok(dst, len)))
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+		return 0;
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+
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 	allow_write_to_user(dst, len);
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42
 
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-	*err_ptr = 0;
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+	csum = csum_partial_copy_generic(src, (void __force *)dst, len);
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44
 
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-	if (!len) {
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-		csum = 0;
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-		goto out;
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-	}
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-
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-	if (unlikely((len < 0) || !access_ok(VERIFY_WRITE, dst, len))) {
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-		*err_ptr = -EFAULT;
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-		csum = -1; /* invalid checksum */
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-		goto out;
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-	}
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-
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-	csum = csum_partial_copy_generic(src, (void __force *)dst,
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-					 len, sum, NULL, err_ptr);
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-
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-	if (unlikely(*err_ptr)) {
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-		csum = csum_partial(src, len, sum);
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-
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-		if (copy_to_user(dst, src, len)) {
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-			*err_ptr = -EFAULT;
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-			csum = -1; /* invalid checksum */
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-		}
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-	}
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-
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-out:
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 	prevent_write_to_user(dst, len);
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-	return (__force __wsum)csum;
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+	return csum;
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 }
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 EXPORT_SYMBOL(csum_and_copy_to_user);