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net: avoid one loop iteration in __skb_splice_bits

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If *len is equal to 0 at the beginning of __splice_segment
it returns true directly. But when decreasing *len from
a positive number to 0 in __splice_segment, it returns false.
The __skb_splice_bits needs to call __splice_segment again.

Recheck *len if it changes, return true in time.
Reduce unnecessary calls to __splice_segment.

Signed-off-by: Pengtao He <hept.hept.hept@gmail.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://patch.msgid.link/20250819021551.8361-1-hept.hept.hept@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Pengtao He 2025-08-19 10:15:51 +08:00 committed by Jakub Kicinski
parent c3199adbe4
commit 8f2c72f225
1 changed files with 3 additions and 1 deletions
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4
net/core/skbuff.c
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@ -3112,7 +3112,9 @@ static bool __splice_segment(struct page *page, unsigned int poff,
poff += flen;
plen -= flen;
*len -= flen;
} while (*len && plen);
if (!*len)
return true;
} while (plen);
return false;
}