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subr_bus: restore bus_null_rescan()

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Partially revert the previous change; we need to keep this method as a
specific override for pci_driver subclasses which should not use
pci_rescan_method() -- cardbus and ofw_pcibus. However, change the return
value to ENODEV for the same reasoning given in the original commit, and
use this as the default rescan method in bus_if.m.

Reported by:	jhb
Fixes:		36a8572ee8f5 ("bus_if: provide a default null rescan method")
MFC with:	36a8572ee8f5
This commit is contained in:
Mitchell Horne 2022-06-23 15:44:28 -03:00
parent a85bbbea91
commit 29afffb942
5 changed files with 17 additions and 7 deletions
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1
sys/dev/cardbus/cardbus.c
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@ -351,6 +351,7 @@ static device_method_t cardbus_methods[] = {
DEVMETHOD(bus_get_dma_tag, bus_generic_get_dma_tag),
DEVMETHOD(bus_read_ivar, cardbus_read_ivar),
DEVMETHOD(bus_driver_added, cardbus_driver_added),
DEVMETHOD(bus_rescan, bus_null_rescan),
/* Card Interface */
DEVMETHOD(card_attach_card, cardbus_attach_card),

8
sys/kern/bus_if.m
View File

@ -78,12 +78,6 @@ CODE {
{
return (0);
}
static int
null_rescan(device_t dev)
{
return (ENODEV);
}
};
/**
@ -260,7 +254,7 @@ METHOD device_t add_child {
*/
METHOD int rescan {
device_t _dev;
} DEFAULT null_rescan;
} DEFAULT bus_null_rescan;
/**
* @brief Allocate a system resource

13
sys/kern/subr_bus.c
View File

@ -4708,6 +4708,19 @@ bus_generic_get_device_path(device_t bus, device_t child, const char *locator,
return (0);
}
/**
* @brief Helper function for implementing BUS_RESCAN().
*
* This null implementation of BUS_RESCAN() always fails to indicate
* the bus does not support rescanning.
*/
int
bus_null_rescan(device_t dev)
{
return (ENODEV);
}
/*
* Some convenience functions to make it easier for drivers to use the
* resource-management functions. All these really do is hide the

1
sys/powerpc/ofw/ofw_pcibus.c
View File

@ -81,6 +81,7 @@ static device_method_t ofw_pcibus_methods[] = {
/* Bus interface */
DEVMETHOD(bus_child_deleted, ofw_pcibus_child_deleted),
DEVMETHOD(bus_child_pnpinfo, ofw_pcibus_child_pnpinfo_method),
DEVMETHOD(bus_rescan, bus_null_rescan),
DEVMETHOD(bus_get_cpus, ofw_pcibus_get_cpus),
DEVMETHOD(bus_get_domain, ofw_pcibus_get_domain),

1
sys/sys/bus.h
View File

@ -513,6 +513,7 @@ int bus_generic_get_device_path(device_t bus, device_t child, const char *locato
struct sbuf *sb);
int bus_helper_reset_post(device_t dev, int flags);
int bus_helper_reset_prepare(device_t dev, int flags);
int bus_null_rescan(device_t dev);
/*
* Wrapper functions for the BUS_*_RESOURCE methods to make client code