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PCI: Deprecate pcim_iomap_table(), pcim_iomap_regions_request_all()

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Deprecate pcim_iomap_table().  It returns a pointer to a table of
ioremapped BARs, or NULL if it fails.  This makes uses like this:

  addr = pcim_iomap_table(pdev)[0];

problematic because it causes a NULL pointer dereference on failure.
Callers should use pcim_iomap() instead.

Deprecate pcim_iomap_regions_request_all() because it is built on
__pci_request_region() and is managed if pcim_enable_device() has been
called, but unmanaged otherwise, which is prone to errors.

Callers should either use pcim_iomap_regions() to request and map BARs, or
use pcim_request_region() followed by pcim_iomap().

Link: https://lore.kernel.org/r/20240613115032.29098-5-pstanner@redhat.com
Signed-off-by: Philipp Stanner <pstanner@redhat.com>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
[bhelgaas: commit log, sphinx markup]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Philipp Stanner 2024-06-13 13:50:17 +02:00 committed by Krzysztof Wilczyński
parent bbaff68bf4
commit e354bb84a4
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GPG key ID: 7C64768D3DE334E7
1 changed files with 11 additions and 1 deletions
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12
drivers/pci/devres.c
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@ -510,7 +510,7 @@ static void pcim_iomap_release(struct device *gendev, void *res)
}
/**
* pcim_iomap_table - access iomap allocation table
* pcim_iomap_table - access iomap allocation table (DEPRECATED)
* @pdev: PCI device to access iomap table for
*
* Returns:
@ -524,6 +524,11 @@ static void pcim_iomap_release(struct device *gendev, void *res)
* This function might sleep when the table is first allocated but can
* be safely called without context and guaranteed to succeed once
* allocated.
*
* This function is DEPRECATED. Do not use it in new code. Instead, obtain a
* mapping's address directly from one of the pcim_* mapping functions. For
* example:
* void __iomem \*mappy = pcim_iomap(pdev, bar, length);
*/
void __iomem * const *pcim_iomap_table(struct pci_dev *pdev)
{
@ -897,6 +902,7 @@ static int pcim_request_all_regions(struct pci_dev *pdev, const char *name)
/**
* pcim_iomap_regions_request_all - Request all BARs and iomap specified ones
* (DEPRECATED)
* @pdev: PCI device to map IO resources for
* @mask: Mask of BARs to iomap
* @name: Name associated with the requests
@ -907,6 +913,10 @@ static int pcim_request_all_regions(struct pci_dev *pdev, const char *name)
*
* To release these resources manually, call pcim_release_region() for the
* regions and pcim_iounmap() for the mappings.
*
* This function is DEPRECATED. Don't use it in new code. Instead, use one
* of the pcim_* region request functions in combination with a pcim_*
* mapping function.
*/
int pcim_iomap_regions_request_all(struct pci_dev *pdev, int mask,
const char *name)