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docs: driver-api: firmware: clarify userspace requirements

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The guidelines mention that firmware updates can't break the kernel,
but it doesn't state directly that they can't break userspace programs.
Make it explicit that firmware updates cannot break UAPI.

Signed-off-by: Jacek Lawrynowicz <jacek.lawrynowicz@linux.intel.com>
Acked-by: Dave Airlie <airlied@redhat.com>
[jc: fixed "no trailing newline"]
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20250314100137.2972355-1-jacek.lawrynowicz@linux.intel.com
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Jacek Lawrynowicz 2025-03-14 11:01:36 +01:00 committed by Jonathan Corbet
parent 4e6b7141d1
commit 5b8f85d081
1 changed files with 5 additions and 0 deletions
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5
Documentation/driver-api/firmware/firmware-usage-guidelines.rst
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@ -42,3 +42,8 @@ then of course these rules will not apply strictly.)
deprecating old major versions, then this should only be done as a
last option, and be stated clearly in all communications.
* Firmware files that affect the User API (UAPI) shall not introduce
changes that break existing userspace programs. Updates to such firmware
must ensure backward compatibility with existing userspace applications.
This includes maintaining consistent interfaces and behaviors that
userspace programs rely on.