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authorAl Viro <viro@zeniv.linux.org.uk>2020-07-11 00:27:49 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2020-08-20 15:45:15 -0400
commitc693cc4676a055c4126e487b30b0a96ea7ec9936 (patch)
tree8f057e3923deeffd1405e40e7ab1c056fa204189 /include/net/checksum.h
parent99a2c96d52d312b11a943372964226fa134de3b1 (diff)
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saner calling conventions for csum_and_copy_..._user()
All callers of these primitives will * discard anything we might've copied in case of error * ignore the csum value in case of error * always pass 0xffffffff as the initial sum, so the resulting csum value (in case of success, that is) will never be 0. That suggest the following calling conventions: * don't pass err_ptr - just return 0 on error. * don't bother with zeroing destination, etc. in case of error * don't pass the initial sum - just use 0xffffffff. This commit does the minimal conversion in the instances of csum_and_copy_...(); the changes of actual asm code behind them are done later in the series. Note that this asm code is often shared with csum_partial_copy_nocheck(); the difference is that csum_partial_copy_nocheck() passes 0 for initial sum while csum_and_copy_..._user() pass 0xffffffff. Fortunately, we are free to pass 0xffffffff in all cases and subsequent patches will use that freedom without any special comments. A part that could be split off: parisc and uml/i386 claimed to have csum_and_copy_to_user() instances of their own, but those were identical to the generic one, so we simply drop them. Not sure if it's worth a separate commit... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'include/net/checksum.h')
-rw-r--r--include/net/checksum.h15
1 files changed, 6 insertions, 9 deletions
diff --git a/include/net/checksum.h b/include/net/checksum.h
index 1029191986e3..0d05b9e8690b 100644
--- a/include/net/checksum.h
+++ b/include/net/checksum.h
@@ -24,26 +24,23 @@
#ifndef _HAVE_ARCH_COPY_AND_CSUM_FROM_USER
static inline
__wsum csum_and_copy_from_user (const void __user *src, void *dst,
- int len, __wsum sum, int *err_ptr)
+ int len)
{
if (copy_from_user(dst, src, len))
- *err_ptr = -EFAULT;
- return csum_partial(dst, len, sum);
+ return 0;
+ return csum_partial(dst, len, ~0U);
}
#endif
#ifndef HAVE_CSUM_COPY_USER
static __inline__ __wsum csum_and_copy_to_user
-(const void *src, void __user *dst, int len, __wsum sum, int *err_ptr)
+(const void *src, void __user *dst, int len)
{
- sum = csum_partial(src, len, sum);
+ __wsum sum = csum_partial(src, len, ~0U);
if (copy_to_user(dst, src, len) == 0)
return sum;
- if (len)
- *err_ptr = -EFAULT;
-
- return (__force __wsum)-1; /* invalid checksum */
+ return 0;
}
#endif