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H A Dcurl.c34db05e7 Mon May 15 05:00:54 CDT 2017 Paolo Bonzini <pbonzini@redhat.com> curl: never invoke callbacks with s->mutex held

All curl callbacks go through curl_multi_do, and hence are called with
s->mutex held. Note that with comments, and make curl_read_cb drop the
lock before invoking the callback.

Likewise for curl_find_buf, where the callback can be invoked by the
caller.

Cc: qemu-stable@nongnu.org
Reviewed-by: Jeff Cody <jcody@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-id: 20170515100059.15795-3-pbonzini@redhat.com
Signed-off-by: Jeff Cody <jcody@redhat.com>