qemu/hw/pci-host
Markus Armbruster d2623129a7 qom: Drop parameter @errp of object_property_add() & friends
The only way object_property_add() can fail is when a property with
the same name already exists.  Since our property names are all
hardcoded, failure is a programming error, and the appropriate way to
handle it is passing &error_abort.

Same for its variants, except for object_property_add_child(), which
additionally fails when the child already has a parent.  Parentage is
also under program control, so this is a programming error, too.

We have a bit over 500 callers.  Almost half of them pass
&error_abort, slightly fewer ignore errors, one test case handles
errors, and the remaining few callers pass them to their own callers.

The previous few commits demonstrated once again that ignoring
programming errors is a bad idea.

Of the few ones that pass on errors, several violate the Error API.
The Error ** argument must be NULL, &error_abort, &error_fatal, or a
pointer to a variable containing NULL.  Passing an argument of the
latter kind twice without clearing it in between is wrong: if the
first call sets an error, it no longer points to NULL for the second
call.  ich9_pm_add_properties(), sparc32_ledma_realize(),
sparc32_dma_realize(), xilinx_axidma_realize(), xilinx_enet_realize()
are wrong that way.

When the one appropriate choice of argument is &error_abort, letting
users pick the argument is a bad idea.

Drop parameter @errp and assert the preconditions instead.

There's one exception to "duplicate property name is a programming
error": the way object_property_add() implements the magic (and
undocumented) "automatic arrayification".  Don't drop @errp there.
Instead, rename object_property_add() to object_property_try_add(),
and add the obvious wrapper object_property_add().

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20200505152926.18877-15-armbru@redhat.com>
[Two semantic rebase conflicts resolved]
2020-05-15 07:07:58 +02:00
..
bonito.c hw: replace hw/i386/pc.h with a header just for the i8259 2019-12-17 19:33:49 +01:00
designware.c hw/pci-host/designware: Remove unuseful FALLTHROUGH comment 2020-01-24 20:59:08 +01:00
gpex.c Include hw/qdev-properties.h less 2019-08-16 13:31:53 +02:00
grackle.c qom: Drop parameter @errp of object_property_add() & friends 2020-05-15 07:07:58 +02:00
i440fx.c qom: Drop parameter @errp of object_property_add() & friends 2020-05-15 07:07:58 +02:00
Kconfig hw/pci-host: Add Kconfig entry to select the IGD Passthrough Host Bridge 2019-12-18 02:34:12 +01:00
Makefile.objs ppc/pnv: Add models for POWER8 PHB3 PCIe Host bridge 2020-02-02 14:07:57 +11:00
pam.c Clean up inclusion of sysemu/sysemu.h 2019-08-16 13:31:53 +02:00
pnv_phb3_msi.c qom: Drop parameter @errp of object_property_add() & friends 2020-05-15 07:07:58 +02:00
pnv_phb3_pbcq.c qom: Drop parameter @errp of object_property_add() & friends 2020-05-15 07:07:58 +02:00
pnv_phb3.c ppc/pnv: change the PowerNV machine devices to be non user creatable 2020-02-02 14:07:57 +11:00
pnv_phb4_pec.c pnv/phb4: Fix error path in pnv_pec_realize() 2020-02-21 09:15:04 +11:00
pnv_phb4.c ppc/pnv: change the PowerNV machine devices to be non user creatable 2020-02-02 14:07:57 +11:00
ppce500.c qdev: set properties with device_class_set_props() 2020-01-24 20:59:15 +01:00
prep.c hw/pci-host: Use memory_region_init_rom() with read-only regions 2020-03-17 15:18:47 +01:00
q35.c qom: Drop parameter @errp of object_property_add() & friends 2020-05-15 07:07:58 +02:00
sabre.c qom: Drop parameter @errp of object_property_add() & friends 2020-05-15 07:07:58 +02:00
trace-events trace-events: Shorten file names in comments 2019-03-22 16:18:07 +00:00
uninorth.c qom: Drop parameter @errp of object_property_add() & friends 2020-05-15 07:07:58 +02:00
versatile.c qdev: set properties with device_class_set_props() 2020-01-24 20:59:15 +01:00
xen_igd_pt.c hw/pci-host/i440fx: Extract the IGD passthrough host bridge device 2019-12-18 02:34:12 +01:00
xilinx-pcie.c qdev: set properties with device_class_set_props() 2020-01-24 20:59:15 +01:00