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From 695e02fdf90a0487f70b26b276e71e0924a817dc Mon Sep 17 00:00:00 2001
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From: Markus Armbruster <armbru@redhat.com>
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Date: Thu, 16 Jan 2014 15:25:19 -0500
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Subject: [PATCH 13/14] qdev: Document that pointer properties kill device_add
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Message-id: <1389885919-16158-3-git-send-email-armbru@redhat.com>
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Patchwork-id: 56749
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O-Subject: [PATCH 7.0 qemu-kvm 2/2] qdev: Document that pointer properties kill device_add
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Bugzilla: 1031098
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RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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Ask users of DEFINE_PROP_PTR() to set
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cannot_instantiate_with_device_add_yet, or explain why it's not
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needed.
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Signed-off-by: Markus Armbruster <armbru@redhat.com>
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Signed-off-by: Andreas Färber <afaerber@suse.de>
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(cherry picked from commit c272758f93b9c88c884461a2baa37b8f4008bf02)
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---
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include/hw/qdev-properties.h | 17 +++++++++++++++++
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1 file changed, 17 insertions(+)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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include/hw/qdev-properties.h | 17 +++++++++++++++++
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1 file changed, 17 insertions(+)
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diff --git a/include/hw/qdev-properties.h b/include/hw/qdev-properties.h
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index 692f82e..77c6f7c 100644
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--- a/include/hw/qdev-properties.h
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+++ b/include/hw/qdev-properties.h
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@@ -122,8 +122,25 @@ extern PropertyInfo qdev_prop_arraylen;
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#define DEFINE_PROP_PCI_DEVFN(_n, _s, _f, _d) \
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DEFINE_PROP_DEFAULT(_n, _s, _f, _d, qdev_prop_pci_devfn, int32_t)
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+/*
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+ * Please avoid pointer properties. If you must use them, you must
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+ * cover them in their device's class init function as follows:
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+ *
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+ * - If the property must be set, the device cannot be used with
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+ * device_add, so add code like this:
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+ * |* Reason: pointer property "NAME-OF-YOUR-PROP" *|
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+ * DeviceClass *dc = DEVICE_CLASS(class);
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+ * dc->cannot_instantiate_with_device_add_yet = true;
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+ *
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+ * - If the property may safely remain null, document it like this:
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+ * |*
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+ * * Note: pointer property "interrupt_vector" may remain null, thus
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+ * * no need for dc->cannot_instantiate_with_device_add_yet = true;
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+ * *|
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+ */
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#define DEFINE_PROP_PTR(_n, _s, _f) \
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DEFINE_PROP(_n, _s, _f, qdev_prop_ptr, void*)
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+
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#define DEFINE_PROP_CHR(_n, _s, _f) \
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DEFINE_PROP(_n, _s, _f, qdev_prop_chr, CharDriverState*)
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#define DEFINE_PROP_STRING(_n, _s, _f) \
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--
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1.8.3.1
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