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parisc: Fix iodc and device path return values on old machines

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Older machines may not fully initialize the return values when asking for IODC
and device path data when building the inventory.  Work around possible
firmware leaks by proper initialization of the variables.

Signed-off-by: Helge Deller <deller@gmx.de>
This commit is contained in:
Helge Deller
2025-10-09 23:37:28 +02:00
parent 44ac7f5c6d
commit f4edb5c52c
1 changed files with 6 additions and 0 deletions
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6
arch/parisc/kernel/drivers.c
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@@ -995,6 +995,7 @@ static __init int qemu_print_iodc_data(struct device *lin_dev, void *data)
struct pdc_system_map_mod_info pdc_mod_info;
struct pdc_module_path mod_path;
memset(&iodc_data, 0, sizeof(iodc_data));
status = pdc_iodc_read(&count, hpa, 0,
&iodc_data, sizeof(iodc_data));
if (status != PDC_OK) {
@@ -1012,6 +1013,11 @@ static __init int qemu_print_iodc_data(struct device *lin_dev, void *data)
mod_index = 0;
do {
/* initialize device path for old machines */
memset(&mod_path, 0xff, sizeof(mod_path));
get_node_path(dev->dev.parent, &mod_path.path);
mod_path.path.mod = dev->hw_path;
memset(&pdc_mod_info, 0, sizeof(pdc_mod_info));
status = pdc_system_map_find_mods(&pdc_mod_info,
&mod_path, mod_index++);
} while (status == PDC_OK && pdc_mod_info.mod_addr != hpa);