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2024-01-05 071106ecf68c401173c58808b1cf5f68cc50d390

 kernel/arch/mips/include/asm/checksum.h
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@@ -34,42 +34,17 @@
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  */
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 __wsum csum_partial(const void *buff, int len, __wsum sum);
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-__wsum __csum_partial_copy_kernel(const void *src, void *dst,
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-				  int len, __wsum sum, int *err_ptr);
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-
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-__wsum __csum_partial_copy_from_user(const void *src, void *dst,
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-				     int len, __wsum sum, int *err_ptr);
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-__wsum __csum_partial_copy_to_user(const void *src, void *dst,
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-				   int len, __wsum sum, int *err_ptr);
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-/*
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- * this is a new version of the above that records errors it finds in *errp,
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- * but continues and zeros the rest of the buffer.
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- */
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-static inline
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-__wsum csum_partial_copy_from_user(const void __user *src, void *dst, int len,
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-				   __wsum sum, int *err_ptr)
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-{
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-	might_fault();
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-	if (uaccess_kernel())
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-		return __csum_partial_copy_kernel((__force void *)src, dst,
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-						  len, sum, err_ptr);
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-	else
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-		return __csum_partial_copy_from_user((__force void *)src, dst,
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-						     len, sum, err_ptr);
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-}
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+__wsum __csum_partial_copy_from_user(const void __user *src, void *dst, int len);
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+__wsum __csum_partial_copy_to_user(const void *src, void __user *dst, int len);
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 #define _HAVE_ARCH_COPY_AND_CSUM_FROM_USER
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 static inline
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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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+__wsum csum_and_copy_from_user(const void __user *src, void *dst, int len)
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 {
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-	if (access_ok(VERIFY_READ, src, len))
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-		return csum_partial_copy_from_user(src, dst, len, sum,
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-						   err_ptr);
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-	if (len)
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-		*err_ptr = -EFAULT;
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-
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-	return sum;
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+	might_fault();
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+	if (!access_ok(src, len))
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+		return 0;
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+	return __csum_partial_copy_from_user(src, dst, len);
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 }
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 /*
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@@ -77,33 +52,24 @@
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  */
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 #define HAVE_CSUM_COPY_USER
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 static inline
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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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 	might_fault();
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-	if (access_ok(VERIFY_WRITE, dst, len)) {
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-		if (uaccess_kernel())
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-			return __csum_partial_copy_kernel(src,
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-							  (__force void *)dst,
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-							  len, sum, err_ptr);
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-		else
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-			return __csum_partial_copy_to_user(src,
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-							   (__force void *)dst,
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-							   len, sum, err_ptr);
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-	}
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-	if (len)
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-		*err_ptr = -EFAULT;
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-
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-	return (__force __wsum)-1; /* invalid checksum */
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+	if (!access_ok(dst, len))
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+		return 0;
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+	return __csum_partial_copy_to_user(src, dst, len);
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 }
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 /*
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  * the same as csum_partial, but copies from user space (but on MIPS
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  * we have just one address space, so this is identical to the above)
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  */
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-__wsum csum_partial_copy_nocheck(const void *src, void *dst,
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-				       int len, __wsum sum);
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-#define csum_partial_copy_nocheck csum_partial_copy_nocheck
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+#define _HAVE_ARCH_CSUM_AND_COPY
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+__wsum __csum_partial_copy_nocheck(const void *src, void *dst, int len);
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+static inline __wsum csum_partial_copy_nocheck(const void *src, void *dst, int len)
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+{
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+	return __csum_partial_copy_nocheck(src, dst, len);
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+}
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 /*
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  *	Fold a partial checksum without adding pseudo headers
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@@ -113,9 +79,9 @@
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 	u32 sum = (__force u32)csum;
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 	sum += (sum << 16);
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-	csum = (sum < csum);
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+	csum = (__force __wsum)(sum < (__force u32)csum);
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 	sum >>= 16;
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-	sum += csum;
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+	sum += (__force u32)csum;
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 	return (__force __sum16)~sum;
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 }