diff options
| author | Robin Murphy <robin.murphy@arm.com> | 2022-05-09 13:16:08 +0300 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2022-05-13 16:08:20 +0300 |
| commit | b8397a8f4ebc0b84eefd990dc08995ba2ae9015c (patch) | |
| tree | 0bc4580aebbe9f2c76334c542b6184d7f5beb1ac /drivers/pci | |
| parent | a3884774d731f03d3a3dd4fb70ec2d9341ceb39d (diff) | |
| download | linux-b8397a8f4ebc0b84eefd990dc08995ba2ae9015c.tar.xz | |
iommu/dma: Explicitly sort PCI DMA windows
Originally, creating the dma_ranges resource list in pre-sorted fashion
was the simplest and most efficient way to enforce the order required by
iova_reserve_pci_windows(). However since then at least one PCI host
driver is now re-sorting the list for its own probe-time processing,
which doesn't seem entirely unreasonable, so that basic assumption no
longer holds. Make iommu-dma robust and get the sort order it needs by
explicitly sorting, which means we can also save the effort at creation
time and just build the list in whatever natural order the DT had.
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/35661036a7e4160850895f9b37f35408b6a29f2f.1652091160.git.robin.murphy@arm.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/of.c | 8 |
1 files changed, 1 insertions, 7 deletions
diff --git a/drivers/pci/of.c b/drivers/pci/of.c index cb2e8351c2cc..8f0ebaf9ae85 100644 --- a/drivers/pci/of.c +++ b/drivers/pci/of.c @@ -369,7 +369,6 @@ static int devm_of_pci_get_host_bridge_resources(struct device *dev, dev_dbg(dev, "Parsing dma-ranges property...\n"); for_each_of_pci_range(&parser, &range) { - struct resource_entry *entry; /* * If we failed translation or got a zero-sized region * then skip this range @@ -393,12 +392,7 @@ static int devm_of_pci_get_host_bridge_resources(struct device *dev, goto failed; } - /* Keep the resource list sorted */ - resource_list_for_each_entry(entry, ib_resources) - if (entry->res->start > res->start) - break; - - pci_add_resource_offset(&entry->node, res, + pci_add_resource_offset(ib_resources, res, res->start - range.pci_addr); } |