PCI: Ensure relaxed tail alignment does not increase min_align

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commit 6e460c3d61 upstream.

When using relaxed tail alignment for the bridge window, pbus_size_mem()
also tries to minimize min_align, which can under certain scenarios end up
increasing min_align from that found by calculate_mem_align().

Ensure min_align is not increased by the relaxed tail alignment.

Eventually, it would be better to add calculate_relaxed_head_align()
similar to calculate_mem_align() which finds out what alignment can be used
for the head without introducing any gaps into the bridge window to give
flexibility on head address too. But that looks relatively complex so it
requires much more testing than fixing the immediate problem causing a
regression.

Fixes: 67f9085596 ("PCI: Allow relaxed bridge window tail sizing for optional resources")
Reported-by: Rio Liu <rio@r26.me>
Closes: https://lore.kernel.org/all/o2bL8MtD_40-lf8GlslTw-AZpUPzm8nmfCnJKvS8RQ3NOzOW1uq1dVCEfRpUjJ2i7G2WjfQhk2IWZ7oGp-7G-jXN4qOdtnyOcjRR0PZWK5I=@r26.me/
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Tested-by: Rio Liu <rio@r26.me>
Cc: stable@vger.kernel.org	# v6.15+
Link: https://patch.msgid.link/20250822123359.16305-2-ilpo.jarvinen@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Ilpo Järvinen 2025-06-30 17:26:39 +03:00 • committed by Greg Kroah-Hartman

parent 5ff676fc9e

commit 2f952e4ead

1 changed files with 7 additions and 4 deletions

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drivers/pci/setup-bus.c

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