diff options
Diffstat (limited to 'drivers/pci/pci-sysfs.c')
| -rw-r--r-- | drivers/pci/pci-sysfs.c | 82 |
1 files changed, 58 insertions, 24 deletions
diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c index d57ae71d32b1..8568b207f189 100644 --- a/drivers/pci/pci-sysfs.c +++ b/drivers/pci/pci-sysfs.c @@ -91,6 +91,7 @@ pci_read_config(struct kobject *kobj, char *buf, loff_t off, size_t count) struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj)); unsigned int size = 64; loff_t init_off = off; + u8 *data = (u8*) buf; /* Several chips lock up trying to read undefined config space */ if (capable(CAP_SYS_ADMIN)) { @@ -108,30 +109,47 @@ pci_read_config(struct kobject *kobj, char *buf, loff_t off, size_t count) size = count; } - while (off & 3) { - unsigned char val; + if ((off & 1) && size) { + u8 val; pci_read_config_byte(dev, off, &val); - buf[off - init_off] = val; + data[off - init_off] = val; off++; - if (--size == 0) - break; + size--; + } + + if ((off & 3) && size > 2) { + u16 val; + pci_read_config_word(dev, off, &val); + data[off - init_off] = val & 0xff; + data[off - init_off + 1] = (val >> 8) & 0xff; + off += 2; + size -= 2; } while (size > 3) { - unsigned int val; + u32 val; pci_read_config_dword(dev, off, &val); - buf[off - init_off] = val & 0xff; - buf[off - init_off + 1] = (val >> 8) & 0xff; - buf[off - init_off + 2] = (val >> 16) & 0xff; - buf[off - init_off + 3] = (val >> 24) & 0xff; + data[off - init_off] = val & 0xff; + data[off - init_off + 1] = (val >> 8) & 0xff; + data[off - init_off + 2] = (val >> 16) & 0xff; + data[off - init_off + 3] = (val >> 24) & 0xff; off += 4; size -= 4; } - while (size > 0) { - unsigned char val; + if (size >= 2) { + u16 val; + pci_read_config_word(dev, off, &val); + data[off - init_off] = val & 0xff; + data[off - init_off + 1] = (val >> 8) & 0xff; + off += 2; + size -= 2; + } + + if (size > 0) { + u8 val; pci_read_config_byte(dev, off, &val); - buf[off - init_off] = val; + data[off - init_off] = val; off++; --size; } @@ -145,6 +163,7 @@ pci_write_config(struct kobject *kobj, char *buf, loff_t off, size_t count) struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj)); unsigned int size = count; loff_t init_off = off; + u8 *data = (u8*) buf; if (off > dev->cfg_size) return 0; @@ -152,26 +171,41 @@ pci_write_config(struct kobject *kobj, char *buf, loff_t off, size_t count) size = dev->cfg_size - off; count = size; } - - while (off & 3) { - pci_write_config_byte(dev, off, buf[off - init_off]); + + if ((off & 1) && size) { + pci_write_config_byte(dev, off, data[off - init_off]); off++; - if (--size == 0) - break; + size--; } + + if ((off & 3) && size > 2) { + u16 val = data[off - init_off]; + val |= (u16) data[off - init_off + 1] << 8; + pci_write_config_word(dev, off, val); + off += 2; + size -= 2; + } while (size > 3) { - unsigned int val = buf[off - init_off]; - val |= (unsigned int) buf[off - init_off + 1] << 8; - val |= (unsigned int) buf[off - init_off + 2] << 16; - val |= (unsigned int) buf[off - init_off + 3] << 24; + u32 val = data[off - init_off]; + val |= (u32) data[off - init_off + 1] << 8; + val |= (u32) data[off - init_off + 2] << 16; + val |= (u32) data[off - init_off + 3] << 24; pci_write_config_dword(dev, off, val); off += 4; size -= 4; } + + if (size >= 2) { + u16 val = data[off - init_off]; + val |= (u16) data[off - init_off + 1] << 8; + pci_write_config_word(dev, off, val); + off += 2; + size -= 2; + } - while (size > 0) { - pci_write_config_byte(dev, off, buf[off - init_off]); + if (size) { + pci_write_config_byte(dev, off, data[off - init_off]); off++; --size; } |
