Commit 66af4230 authored by Andrey Grodzovsky's avatar Andrey Grodzovsky Committed by Greg Kroah-Hartman

xen/pciback: Fix conf_space read/write overlap check.

commit 02ef871e upstream.

Current overlap check is evaluating to false a case where a filter
field is fully contained (proper subset) of a r/w request.  This
change applies classical overlap check instead to include all the
scenarios.

More specifically, for (Hilscher GmbH CIFX 50E-DP(M/S)) device driver
the logic is such that the entire confspace is read and written in 4
byte chunks. In this case as an example, CACHE_LINE_SIZE,
LATENCY_TIMER and PCI_BIST are arriving together in one call to
xen_pcibk_config_write() with offset == 0xc and size == 4.  With the
exsisting overlap check the LATENCY_TIMER field (offset == 0xd, length
== 1) is fully contained in the write request and hence is excluded
from write, which is incorrect.
Signed-off-by: default avatarAndrey Grodzovsky <andrey2805@gmail.com>
Reviewed-by: default avatarBoris Ostrovsky <boris.ostrovsky@oracle.com>
Reviewed-by: default avatarJan Beulich <JBeulich@suse.com>
Signed-off-by: default avatarDavid Vrabel <david.vrabel@citrix.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 6bce4d0e
......@@ -183,8 +183,7 @@ int xen_pcibk_config_read(struct pci_dev *dev, int offset, int size,
field_start = OFFSET(cfg_entry);
field_end = OFFSET(cfg_entry) + field->size;
if ((req_start >= field_start && req_start < field_end)
|| (req_end > field_start && req_end <= field_end)) {
if (req_end > field_start && field_end > req_start) {
err = conf_space_read(dev, cfg_entry, field_start,
&tmp_val);
if (err)
......@@ -230,8 +229,7 @@ int xen_pcibk_config_write(struct pci_dev *dev, int offset, int size, u32 value)
field_start = OFFSET(cfg_entry);
field_end = OFFSET(cfg_entry) + field->size;
if ((req_start >= field_start && req_start < field_end)
|| (req_end > field_start && req_end <= field_end)) {
if (req_end > field_start && field_end > req_start) {
tmp_val = 0;
err = xen_pcibk_config_read(dev, field_start,
......
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