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net: Fix minor code bug in timestamping.txt 

Passing (void*)val instead of &val would make a pointer out of an integer
and cause sock_setsockopt to -EFAULT.

See tools/testing/selftests/networking/timestamping/timestamping.c
for a working example.

Cc: David S. Miller <davem@davemloft.net>
Cc: netdev@vger.kernel.org
Signed-off-by: Ahmad Fatoum <ahmad@a3f.at>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ahmad Fatoum 2017-07-08 21:28:44 +02:00 committed by David S. Miller
parent f4e27944f9
commit 5e34fa23ce
1 changed files with 2 additions and 4 deletions
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6
Documentation/networking/timestamping.txt
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@ -44,8 +44,7 @@ timeval of SO_TIMESTAMP (ms).
Supports multiple types of timestamp requests. As a result, this
socket option takes a bitmap of flags, not a boolean. In
err = setsockopt(fd, SOL_SOCKET, SO_TIMESTAMPING, (void *) val,
sizeof(val));
err = setsockopt(fd, SOL_SOCKET, SO_TIMESTAMPING, &val, sizeof(val));
val is an integer with any of the following bits set. Setting other
bit returns EINVAL and does not change the current state.
@ -249,8 +248,7 @@ setsockopt to receive timestamps:
__u32 val = SOF_TIMESTAMPING_SOFTWARE |
SOF_TIMESTAMPING_OPT_ID /* or any other flag */;
err = setsockopt(fd, SOL_SOCKET, SO_TIMESTAMPING, (void *) val,
sizeof(val));
err = setsockopt(fd, SOL_SOCKET, SO_TIMESTAMPING, &val, sizeof(val));
1.4 Bytestream Timestamps