@@ -337,9 +337,16 @@ static ssize_t pci_vpd_pci22_read(struct pci_dev *dev, loff_t pos, size_t count,
loff_t end = pos + count;
u8 *buf = arg;
- if (pos < 0 || pos > vpd->base.len || end > vpd->base.len)
+ if (pos < 0)
return -EINVAL;
+ if (end > vpd->base.len) {
+ if (pos > vpd->base.len)
+ return 0;
+ end = vpd->base.len;
+ count = end - pos;
+ }
+
if (mutex_lock_killable(&vpd->lock))
return -EINTR;
@@ -554,6 +561,8 @@ int pci_vpd_pci22_init(struct pci_dev *dev)
dev->vpd = &vpd->base;
if (!(dev->dev_flags & PCI_DEV_FLAGS_VPD_REF_F0))
vpd->base.len = pci_vpd_pci22_size(dev);
+ else
+ vpd->base.len = 0;
return 0;
}
@@ -772,10 +772,12 @@ static ssize_t read_vpd_attr(struct file *filp, struct kobject *kobj,
struct pci_dev *dev =
to_pci_dev(container_of(kobj, struct device, kobj));
- if (off > bin_attr->size)
- count = 0;
- else if (count > bin_attr->size - off)
- count = bin_attr->size - off;
+ if (bin_attr->size > 0) {
+ if (off > bin_attr->size)
+ count = 0;
+ else if (count > bin_attr->size - off)
+ count = bin_attr->size - off;
+ }
return pci_read_vpd(dev, off, count, buf);
}
@@ -787,10 +789,12 @@ static ssize_t write_vpd_attr(struct file *filp, struct kobject *kobj,
struct pci_dev *dev =
to_pci_dev(container_of(kobj, struct device, kobj));
- if (off > bin_attr->size)
- count = 0;
- else if (count > bin_attr->size - off)
- count = bin_attr->size - off;
+ if (bin_attr->size > 0) {
+ if (off > bin_attr->size)
+ count = 0;
+ else if (count > bin_attr->size - off)
+ count = bin_attr->size - off;
+ }
return pci_write_vpd(dev, off, count, buf);
}
If the VPD data is accessed via another PCI function than 0 the access is redirected to function 0. However, we shouldn't calculate the actual size as we did for function 0, as there is no guarantee that function 0 is already initialized and VPD access is very costly and error prone. So to avoid all this we set the size to '0' in sysfs, but only return the valid bytes from the underlying function 0. Cc: Alexander Duyck <alexander.duyck@gmail.com> Cc: Bjorn Helgaas <helgaas@kernel.org> Signed-off-by: Hannes Reinecke <hare@suse.com> --- drivers/pci/access.c | 11 ++++++++++- drivers/pci/pci-sysfs.c | 20 ++++++++++++-------- 2 files changed, 22 insertions(+), 9 deletions(-)