tree 63aa5e0c67379f14b419b503b9e7cbc0fd505045
parent 6c86161fec09fa4d543f4ae7fc67dfab22abf457
author Pavel Borzenkov <pavel.borzenkov@gmail.com> 1491556121 +0000
committer John Eikenberry <jae@zhar.net> 1491708577 -0700

Fix race between client's close and write

After commit 506f3a7 which removed clientConn mutex around
conn.sendPacket, it is now possible for conn.Close and conn.Write to
race (https://travis-ci.org/pkg/sftp/jobs/219048782#L1838). The problem
is really hard to reproduce, but I believe this patch fixes it.

Now clientConn.Mutex protects 'inflight' map only, and conn.Mutex
serializes connection writes/close.

Signed-off-by: Pavel Borzenkov <pavel.borzenkov@gmail.com>