mirrors/qemu
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

hw/i386/acpi-build: Fix maybe-uninitialized error when ACPI hotplug off

Browse Source 
GCC 9.3.0 thinks that 'method' can be left uninitialized. This code
is already in the "if (bsel || pcihp_bridge_en)" block statement,
but it isn't smart enough to figure it out.

Restrict the code to be used only in the "if (bsel || pcihp_bridge_en)"
block statement to fix (on Ubuntu):

  ../hw/i386/acpi-build.c: In function 'build_append_pci_bus_devices':
  ../hw/i386/acpi-build.c:496:9: error: 'method' may be used uninitialized
  in this function [-Werror=maybe-uninitialized]
    496 |         aml_append(parent_scope, method);
        |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  cc1: all warnings being treated as errors

Fixes: df4008c9c5 ("piix4: don't reserve hw resources when hotplug is off globally")
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Message-Id: <20201108204535.2319870-4-philmd@redhat.com>
Message-Id: <20201110192316.26397-8-alex.bennee@linaro.org>
This commit is contained in:
Philippe Mathieu-Daudé 2020-11-10 19:23:13 +00:00 committed by Alex Bennée
parent 4bdccdec70
commit 811c74fb65
1 changed files with 21 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
hw/i386/acpi-build.c
View File

@ -465,18 +465,16 @@ static void build_append_pci_bus_devices(Aml *parent_scope, PCIBus *bus,
*/
if (bsel || pcihp_bridge_en) {
method = aml_method("PCNT", 0, AML_NOTSERIALIZED);
}
/* If bus supports hotplug select it and notify about local events */
if (bsel) {
uint64_t bsel_val = qnum_get_uint(qobject_to(QNum, bsel));
aml_append(method, aml_store(aml_int(bsel_val), aml_name("BNUM")));
aml_append(method,
aml_call2("DVNT", aml_name("PCIU"), aml_int(1) /* Device Check */)
);
aml_append(method,
aml_call2("DVNT", aml_name("PCID"), aml_int(3)/* Eject Request */)
);
aml_append(method, aml_call2("DVNT", aml_name("PCIU"),
aml_int(1))); /* Device Check */
aml_append(method, aml_call2("DVNT", aml_name("PCID"),
aml_int(3))); /* Eject Request */
}
/* Notify about child bus events in any case */
@ -492,7 +490,6 @@ static void build_append_pci_bus_devices(Aml *parent_scope, PCIBus *bus,
}
}
if (bsel || pcihp_bridge_en) {
aml_append(parent_scope, method);
}
qobject_unref(bsel);