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PCI: fix bogus "'device' may be used uninitialized" warning in pci_slot

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I get warnings about 'device' possibly being used uninitialised.  While
I can deduce this is not true, it seems that GCC can't.  This patch
changes `check_slot' to return device on success and -1 on error, which
shuts GCC up.

Acked-by: Alex Chiang <achiang@hp.com>
Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Matthew Wilcox 2008-07-22 12:37:17 -06:00 committed by Jesse Barnes
parent d6d3857434
commit 362b7077a5
1 changed files with 7 additions and 11 deletions
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18
drivers/acpi/pci_slot.c
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@ -76,9 +76,9 @@ static struct acpi_pci_driver acpi_pci_slot_driver = {
};
static int
check_slot(acpi_handle handle, int *device, unsigned long *sun)
check_slot(acpi_handle handle, unsigned long *sun)
{
int retval = 0;
int device = -1;
unsigned long adr, sta;
acpi_status status;
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
@ -89,32 +89,27 @@ check_slot(acpi_handle handle, int *device, unsigned long *sun)
if (check_sta_before_sun) {
/* If SxFy doesn't have _STA, we just assume it's there */
status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
if (ACPI_SUCCESS(status) && !(sta & ACPI_STA_DEVICE_PRESENT)) {
retval = -1;
if (ACPI_SUCCESS(status) && !(sta & ACPI_STA_DEVICE_PRESENT))
goto out;
}
}
status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
if (ACPI_FAILURE(status)) {
dbg("_ADR returned %d on %s\n", status, (char *)buffer.pointer);
retval = -1;
goto out;
}
*device = (adr >> 16) & 0xffff;
/* No _SUN == not a slot == bail */
status = acpi_evaluate_integer(handle, "_SUN", NULL, sun);
if (ACPI_FAILURE(status)) {
dbg("_SUN returned %d on %s\n", status, (char *)buffer.pointer);
retval = -1;
goto out;
}
device = (adr >> 16) & 0xffff;
out:
kfree(buffer.pointer);
return retval;
return device;
}
struct callback_args {
@ -144,7 +139,8 @@ register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
struct callback_args *parent_context = context;
struct pci_bus *pci_bus = parent_context->pci_bus;
if (check_slot(handle, &device, &sun))
device = check_slot(handle, &sun);
if (device < 0)
return AE_OK;
slot = kmalloc(sizeof(*slot), GFP_KERNEL);