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| author | Koichiro Den <den@valinux.co.jp> | 2026-03-04 11:05:27 +0900 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2026-07-04 13:41:31 +0200 |
| commit | eb47b9bffd07a47b84910847cb5ea066ce184055 (patch) | |
| tree | 90ef97c3e2039716c0bc4886e224cce313dfe391 | |
| parent | a7a2890028f16e5b0af0bb005d80fcb32559cca3 (diff) | |
| download | linux-eb47b9bffd07a47b84910847cb5ea066ce184055.tar.gz linux-eb47b9bffd07a47b84910847cb5ea066ce184055.zip | |
NTB: epf: Avoid pci_iounmap() with offset when PEER_SPAD and CONFIG share BAR
commit d876153680e3d721d385e554def919bce3d18c74 upstream.
When BAR_PEER_SPAD and BAR_CONFIG share one PCI BAR, the module teardown
path ends up calling pci_iounmap() on the same iomem with some offset,
which is unnecessary and triggers a kernel warning like the following:
Trying to vunmap() nonexistent vm area (0000000069a5ffe8)
WARNING: mm/vmalloc.c:3470 at vunmap+0x58/0x68, CPU#5: modprobe/2937
[...]
Call trace:
vunmap+0x58/0x68 (P)
iounmap+0x34/0x48
pci_iounmap+0x2c/0x40
ntb_epf_pci_remove+0x44/0x80 [ntb_hw_epf]
pci_device_remove+0x48/0xf8
device_remove+0x50/0x88
device_release_driver_internal+0x1c8/0x228
driver_detach+0x50/0xb0
bus_remove_driver+0x74/0x100
driver_unregister+0x34/0x68
pci_unregister_driver+0x34/0xa0
ntb_epf_pci_driver_exit+0x14/0xfe0 [ntb_hw_epf]
[...]
Fix it by unmapping only when PEER_SPAD and CONFIG use difference bars.
Cc: stable@vger.kernel.org
Fixes: e75d5ae8ab88 ("NTB: epf: Allow more flexibility in the memory BAR map method")
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Koichiro Den <den@valinux.co.jp>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/ntb/hw/epf/ntb_hw_epf.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/ntb/hw/epf/ntb_hw_epf.c b/drivers/ntb/hw/epf/ntb_hw_epf.c index 9a0745664dcc..c5bd984823ae 100644 --- a/drivers/ntb/hw/epf/ntb_hw_epf.c +++ b/drivers/ntb/hw/epf/ntb_hw_epf.c @@ -649,7 +649,8 @@ static void ntb_epf_deinit_pci(struct ntb_epf_dev *ndev) struct pci_dev *pdev = ndev->ntb.pdev; pci_iounmap(pdev, ndev->ctrl_reg); - pci_iounmap(pdev, ndev->peer_spad_reg); + if (ndev->barno_map[BAR_PEER_SPAD] != ndev->barno_map[BAR_CONFIG]) + pci_iounmap(pdev, ndev->peer_spad_reg); pci_iounmap(pdev, ndev->db_reg); pci_clear_master(pdev); |