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| author | rpokala <rpokala@FreeBSD.org> | 2017-01-19 23:44:05 +0000 |
|---|---|---|
| committer | rpokala <rpokala@FreeBSD.org> | 2017-01-19 23:44:05 +0000 |
| commit | 2e2a1b132816b5cd5d9a0d3a4357e28e5fc40ffb (patch) | |
| tree | 5ed3b1ddac1c626f02d453e329d638fbbcaab300 | |
| parent | 3d43d47e2dfb79e5d3abb61fc33c636d37e8b842 (diff) | |
| download | FreeBSD-src-2e2a1b132816b5cd5d9a0d3a4357e28e5fc40ffb.zip FreeBSD-src-2e2a1b132816b5cd5d9a0d3a4357e28e5fc40ffb.tar.gz | |
MFC r311963: Remove writability requirement for single-mbuf, contiguous-
range m_pulldown()
m_pulldown() only needs to determine if a mbuf is writable if it is going to
copy data into the data region of an existing mbuf. It does this to create a
contiguous data region in a single mbuf from multiple mbufs in the chain. If
the requested memory region is already contiguous and nothing needs to
change, the mbuf does not need to be writeable.
| -rw-r--r-- | sys/kern/uipc_mbuf2.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/sys/kern/uipc_mbuf2.c b/sys/kern/uipc_mbuf2.c index 00472d3..f69b47e 100644 --- a/sys/kern/uipc_mbuf2.c +++ b/sys/kern/uipc_mbuf2.c @@ -161,7 +161,7 @@ m_pulldown(struct mbuf *m, int off, int len, int *offp) * the target data is on <n, off>. * if we got enough data on the mbuf "n", we're done. */ - if ((off == 0 || offp) && len <= n->m_len - off && writable) + if ((off == 0 || offp) && len <= n->m_len - off) goto ok; /* |
