From 7f16c76e83cedeea0e4cec8942c974885a216865 Mon Sep 17 00:00:00 2001 From: Markus Armbruster Date: Wed, 10 Jun 2020 07:32:11 +0200 Subject: ssi: ssi_auto_connect_slaves() never does anything, drop ssi_auto_connect_slaves(parent, cs_line, bus) iterates over @parent's QOM children @dev of type TYPE_SSI_SLAVE. It puts these on @bus, and sets cs_line[] to qdev_get_gpio_in_named(dev, SSI_GPIO_CS, 0). Suspicious: there is no protection against overrunning cs_line[]. Turns out it's safe because ssi_auto_connect_slaves() never finds any such children. Its called by realize methods of some (but not all) devices providing an SSI bus, and gets passed the device. SSI slave devices are always created with ssi_create_slave_no_init(), optionally via ssi_create_slave(). This adds them to their SSI bus. It doesn't set their QOM parent. ssi_create_slave_no_init() is always immediately followed by qdev_init_nofail(), with no QOM parent assigned, so device_set_realized() puts the device into the /machine/unattached/ orphanage. None become QOM children of a device providing an SSI bus. ssi_auto_connect_slaves() was added in commit b4ae3cfa57 "ssi: Add slave autoconnect helper". I can't see which slaves it was supposed to connect back then. Cc: Alistair Francis Signed-off-by: Markus Armbruster Acked-by: Alistair Francis Reviewed-by: Paolo Bonzini Message-Id: <20200610053247.1583243-23-armbru@redhat.com> --- include/hw/ssi/ssi.h | 4 ---- 1 file changed, 4 deletions(-) (limited to 'include') diff --git a/include/hw/ssi/ssi.h b/include/hw/ssi/ssi.h index 1107cb8..1725b13 100644 --- a/include/hw/ssi/ssi.h +++ b/include/hw/ssi/ssi.h @@ -86,10 +86,6 @@ SSIBus *ssi_create_bus(DeviceState *parent, const char *name); uint32_t ssi_transfer(SSIBus *bus, uint32_t val); -/* Automatically connect all children nodes a spi controller as slaves */ -void ssi_auto_connect_slaves(DeviceState *parent, qemu_irq *cs_lines, - SSIBus *bus); - /* max111x.c */ void max111x_set_input(DeviceState *dev, int line, uint8_t value); -- cgit v1.1