diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/xen/xen-pciback/conf_space.c | 16 |
1 files changed, 6 insertions, 10 deletions
diff --git a/drivers/xen/xen-pciback/conf_space.c b/drivers/xen/xen-pciback/conf_space.c index 6855bf552126..9e9286d0872e 100644 --- a/drivers/xen/xen-pciback/conf_space.c +++ b/drivers/xen/xen-pciback/conf_space.c @@ -148,7 +148,7 @@ int xen_pcibk_config_read(struct pci_dev *dev, int offset, int size, struct xen_pcibk_dev_data *dev_data = pci_get_drvdata(dev); const struct config_field_entry *cfg_entry; const struct config_field *field; - int req_start, req_end, field_start, field_end; + int field_start, field_end; /* if read fails for any reason, return 0 * (as if device didn't respond) */ u32 value = 0, tmp_val; @@ -178,12 +178,10 @@ int xen_pcibk_config_read(struct pci_dev *dev, int offset, int size, list_for_each_entry(cfg_entry, &dev_data->config_fields, list) { field = cfg_entry->field; - req_start = offset; - req_end = offset + size; field_start = OFFSET(cfg_entry); field_end = OFFSET(cfg_entry) + field->size; - if (req_end > field_start && field_end > req_start) { + if (offset + size > field_start && field_end > offset) { err = conf_space_read(dev, cfg_entry, field_start, &tmp_val); if (err) @@ -191,7 +189,7 @@ int xen_pcibk_config_read(struct pci_dev *dev, int offset, int size, value = merge_value(value, tmp_val, get_mask(field->size), - field_start - req_start); + field_start - offset); } } @@ -211,7 +209,7 @@ int xen_pcibk_config_write(struct pci_dev *dev, int offset, int size, u32 value) const struct config_field_entry *cfg_entry; const struct config_field *field; u32 tmp_val; - int req_start, req_end, field_start, field_end; + int field_start, field_end; if (unlikely(verbose_request)) printk(KERN_DEBUG @@ -224,19 +222,17 @@ int xen_pcibk_config_write(struct pci_dev *dev, int offset, int size, u32 value) list_for_each_entry(cfg_entry, &dev_data->config_fields, list) { field = cfg_entry->field; - req_start = offset; - req_end = offset + size; field_start = OFFSET(cfg_entry); field_end = OFFSET(cfg_entry) + field->size; - if (req_end > field_start && field_end > req_start) { + if (offset + size > field_start && field_end > offset) { err = conf_space_read(dev, cfg_entry, field_start, &tmp_val); if (err) break; tmp_val = merge_value(tmp_val, value, get_mask(size), - req_start - field_start); + offset - field_start); err = conf_space_write(dev, cfg_entry, field_start, tmp_val); |