diff options
| author | Koichiro Den <den@valinux.co.jp> | 2026-05-13 11:49:17 +0900 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2026-06-23 10:41:47 -0500 |
| commit | 823468a4ea1613f1c1235bd16af8b9c6eb9c9677 (patch) | |
| tree | f1eb63a892224a91ccb8b60dfb3fc479ee23e6cb /drivers | |
| parent | 6c39350aaa2d6338ec30ef0a5632b0d6dad856ec (diff) | |
| download | ath-823468a4ea1613f1c1235bd16af8b9c6eb9c9677.tar.gz | |
PCI: endpoint: pci-epf-vntb: Exclude reserved slots from db_valid_mask
In pci-epf-vntb, db_count represents the total number of doorbell slots
exposed to the peer, including:
- slot #0 reserved for link events, and
- slot #1 historically unused (kept for compatibility).
Only the remaining slots correspond to actual doorbell bits. The current
db_valid_mask() exposes all slots as valid doorbells.
Limit db_valid_mask() to the real doorbell bits by returning
BIT_ULL(db_count - 2) - 1, and guard against db_count < 2.
Fixes: e35f56bb0330 ("PCI: endpoint: Support NTB transfer between RC and EP")
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>
Link: https://patch.msgid.link/20260513024923.451765-7-den@valinux.co.jp
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/pci/endpoint/functions/pci-epf-vntb.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/pci/endpoint/functions/pci-epf-vntb.c b/drivers/pci/endpoint/functions/pci-epf-vntb.c index 524355a8b4bed..58e41d95d029c 100644 --- a/drivers/pci/endpoint/functions/pci-epf-vntb.c +++ b/drivers/pci/endpoint/functions/pci-epf-vntb.c @@ -1364,7 +1364,10 @@ static int vntb_epf_peer_mw_count(struct ntb_dev *ntb) static u64 vntb_epf_db_valid_mask(struct ntb_dev *ntb) { - return BIT_ULL(ntb_ndev(ntb)->db_count) - 1; + if (ntb_ndev(ntb)->db_count < EPF_IRQ_DB_START) + return 0; + + return BIT_ULL(ntb_ndev(ntb)->db_count - EPF_IRQ_DB_START) - 1; } static int vntb_epf_db_set_mask(struct ntb_dev *ntb, u64 db_bits) |