NTB: epf: Make db_valid_mask cover only real doorbell bits

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[ Upstream commit 6eb7e28f1f ]

ndev->db_count includes an unused doorbell slot due to the legacy extra
offset in the peer doorbell path. db_valid_mask must cover only the real
doorbell bits and exclude the unused slot.

Set db_valid_mask to BIT_ULL(db_count - 1) - 1.

Fixes: 812ce2f8d1 ("NTB: Add support for EPF PCI Non-Transparent Bridge")
Signed-off-by: Koichiro Den <den@valinux.co.jp>
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Link: https://patch.msgid.link/20260513024923.451765-10-den@valinux.co.jp
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Koichiro Den 2026-05-13 11:49:20 +09:00 • committed by Greg Kroah-Hartman

parent 4d4e9686fb

commit 7148d63ee7

1 changed files with 5 additions and 1 deletions

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drivers/ntb/hw/epf/ntb_hw_epf.c

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