The documentation states that pcim_enable_device() will make "all PCI
ops" managed. This is totally false, only a small subset of PCI
functions become managed that way. Implicating otherwise has caused at
least one bug so far, namely in commit 8558de401b5f ("drm/vboxvideo: use
managed pci functions").

Change the function summary so the functions dangerous behavior becomes
obvious.

Signed-off-by: Philipp Stanner <pstanner@redhat.com>
---
+CC PCI and Bjorn.

Bjorn, btw. neither PCI nor you are printed by getmaintainers for the
touched document. Possibly one might want to think about fixing that
somehow.
But I don't think it's a huge deal.
---
 Documentation/driver-api/driver-model/devres.rst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Documentation/driver-api/driver-model/devres.rst b/Documentation/driver-api/driver-model/devres.rst
index ac9ee7441887..5f2ee8d717b1 100644
--- a/Documentation/driver-api/driver-model/devres.rst
+++ b/Documentation/driver-api/driver-model/devres.rst
@@ -391,7 +391,7 @@ PCI
   devm_pci_remap_cfgspace()	: ioremap PCI configuration space
   devm_pci_remap_cfg_resource()	: ioremap PCI configuration space resource
 
-  pcim_enable_device()		: after success, all PCI ops become managed
+  pcim_enable_device()		: after success, some PCI ops become managed
   pcim_iomap()			: do iomap() on a single BAR
   pcim_iomap_regions()		: do request_region() and iomap() on multiple BARs
   pcim_iomap_regions_request_all() : do request_region() on all and iomap() on multiple BARs
-- 
2.45.2

Philipp Stanner <pstanner@redhat.com> writes:

> The documentation states that pcim_enable_device() will make "all PCI
> ops" managed. This is totally false, only a small subset of PCI
> functions become managed that way. Implicating otherwise has caused at
> least one bug so far, namely in commit 8558de401b5f ("drm/vboxvideo: use
> managed pci functions").
>
> Change the function summary so the functions dangerous behavior becomes
> obvious.
>
> Signed-off-by: Philipp Stanner <pstanner@redhat.com>
> ---
> +CC PCI and Bjorn.
>
> Bjorn, btw. neither PCI nor you are printed by getmaintainers for the
> touched document. Possibly one might want to think about fixing that
> somehow.
> But I don't think it's a huge deal.
> ---
>  Documentation/driver-api/driver-model/devres.rst | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Applied, thanks.

jon

On Fri, Aug 09, 2024 at 11:52:48AM +0200, Philipp Stanner wrote:
> The documentation states that pcim_enable_device() will make "all PCI
> ops" managed. This is totally false, only a small subset of PCI
> functions become managed that way. Implicating otherwise has caused at
> least one bug so far, namely in commit 8558de401b5f ("drm/vboxvideo: use
> managed pci functions").
> 
> Change the function summary so the functions dangerous behavior becomes
> obvious.
> 
> Signed-off-by: Philipp Stanner <pstanner@redhat.com>

Acked-by: Bjorn Helgaas <bhelgaas@google.com>

s/Implicating/Suggesting/
s/functions dangerous/function's dangerous/

> ---
> +CC PCI and Bjorn.
> 
> Bjorn, btw. neither PCI nor you are printed by getmaintainers for the
> touched document. Possibly one might want to think about fixing that
> somehow.
> But I don't think it's a huge deal.
> ---
>  Documentation/driver-api/driver-model/devres.rst | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/Documentation/driver-api/driver-model/devres.rst b/Documentation/driver-api/driver-model/devres.rst
> index ac9ee7441887..5f2ee8d717b1 100644
> --- a/Documentation/driver-api/driver-model/devres.rst
> +++ b/Documentation/driver-api/driver-model/devres.rst
> @@ -391,7 +391,7 @@ PCI
>    devm_pci_remap_cfgspace()	: ioremap PCI configuration space
>    devm_pci_remap_cfg_resource()	: ioremap PCI configuration space resource
>  
> -  pcim_enable_device()		: after success, all PCI ops become managed
> +  pcim_enable_device()		: after success, some PCI ops become managed
>    pcim_iomap()			: do iomap() on a single BAR
>    pcim_iomap_regions()		: do request_region() and iomap() on multiple BARs
>    pcim_iomap_regions_request_all() : do request_region() on all and iomap() on multiple BARs
> -- 
> 2.45.2
>