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hw: Mark devices picking up block backends actively FIXME

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Drives defined with if!=none are for board initialization to wire up.
Board code calls drive_get() or similar to find them, and creates
devices with their qdev drive properties set accordingly.

Except a few devices go on a fishing expedition for a suitable backend
instead of exposing a drive property for board code to set: they call
driver_get() or drive_get_next() in their realize() or init() method
to implicitly connect to the "next" backend with a certain interface
type.

Picking up backends that way works when the devices are created by
board code.  But it's inappropriate for -device or device_add.  Not
only is this inconsistent with how the other block device models work
(they connect to a backend explicitly identified by a "drive"
property), it breaks when the "next" backend has been picked up by the
board already.

Example:

    $ qemu-system-arm -S -M connex -pflash flash.img -device ssi-sd
    Aborted (core dumped)

Mark them with suitable FIXME comments.

Cc: Andrzej Zaborowski <balrogg@gmail.com>
Cc: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Cc: "Andreas Färber" <andreas.faerber@web.de>
Cc: Michael Walle <michael@walle.cc>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
This commit is contained in:
Markus Armbruster 2015-03-23 19:03:13 +01:00
parent b8a86c4ac4
commit af9e40aa8f
7 changed files with 8 additions and 0 deletions
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2
hw/isa/pc87312.c
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@ -319,11 +319,13 @@ static void pc87312_realize(DeviceState *dev, Error **errp)
d = DEVICE(isa);
qdev_prop_set_uint32(d, "iobase", get_fdc_iobase(s));
qdev_prop_set_uint32(d, "irq", 6);
/* FIXME use a qdev drive property instead of drive_get() */
drive = drive_get(IF_FLOPPY, 0, 0);
if (drive != NULL) {
qdev_prop_set_drive_nofail(d, "driveA",
blk_by_legacy_dinfo(drive));
}
/* FIXME use a qdev drive property instead of drive_get() */
drive = drive_get(IF_FLOPPY, 0, 1);
if (drive != NULL) {
qdev_prop_set_drive_nofail(d, "driveB",