** Tags added: kernel-daily-bug
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https://bugs.launchpad.net/bugs/2129689
Title:
Ubuntu 24.04, Noble, linux-bluefield-6.8: Fix x86_64 compilation error
in VFIO_DEVICE_P2P_DMA_BUF handler
Status in linux-bluefield package in Ubuntu:
New
Bug description:
SRU Justification:
[IMPACT]
Compilation failure on x86_64 platform during kernel build with certain
compiler configurations. The VFIO_DEVICE_P2P_DMA_BUF case handler in
vfio_pci_core_ioctl() violates C language standards by placing a variable
declaration immediately after a case label without a compound statement. This
causes the error: "a label can only be part of a statement and a declaration is
not a statement" at line 1489 of drivers/vfio/pci/vfio_pci_core.c. The issue
was introduced during the port of commit 60da28814250 ("vfio/pci: Allow MMIO
regions to be exported through dma-buf", buglink
https://bugs.launchpad.net/bugs/2126876) from linux-bluefield-5.15 to
linux-bluefield-6.8 when the function was refactored from an if-else chain to a
switch statement.
[FIX]
Add braces around the VFIO_DEVICE_P2P_DMA_BUF case block to create a compound
statement. This is a minimal two-line change: adding an opening brace after the
case label and a closing brace before the default case. The fix makes the code
compliant with C89/C90/C99/C11 standards without altering any logic or
functionality.
[TEST CASE]
Successfully compiled on linux-bluefield-6.8, master-next branch.
[Regression Potential]
Low risk. The change only adds braces to create a proper compound statement
scope around existing code.
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