linux-kernel - [PATCH] vfio/pds: Fix missing detach

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Message-ID: <20250702163744.69767-1-brett.creeley@amd.com>
Date: Wed, 2 Jul 2025 09:37:44 -0700
From: Brett Creeley <brett.creeley@....com>
To: <jgg@...pe.ca>, <yishaih@...dia.com>,
	<shameerali.kolothum.thodi@...wei.com>, <kevin.tian@...el.com>,
	<alex.williamson@...hat.com>, <kvm@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
CC: <brett.creeley@....com>
Subject: [PATCH] vfio/pds: Fix missing detach_ioas op

When CONFIG_IOMMUFD is enabled and a device is bound to the pds_vfio_pci
driver, the following WARN_ON() trace is seen and probe fails:

WARNING: CPU: 0 PID: 5040 at drivers/vfio/vfio_main.c:317 __vfio_register_dev+0x130/0x140 [vfio]
<...>
pds_vfio_pci 0000:08:00.1: probe with driver pds_vfio_pci failed with error -22

This is because the driver's vfio_device_ops.detach_ioas isn't set.

Fix this by using the generic vfio_iommufd_physical_detach_ioas
function.

Fixes: 38fe3975b4c2 ("vfio/pds: Initial support for pds VFIO driver")
Signed-off-by: Brett Creeley <brett.creeley@....com>
---
 drivers/vfio/pci/pds/vfio_dev.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/vfio/pci/pds/vfio_dev.c b/drivers/vfio/pci/pds/vfio_dev.c
index 76a80ae7087b..f6e0253a8a14 100644
--- a/drivers/vfio/pci/pds/vfio_dev.c
+++ b/drivers/vfio/pci/pds/vfio_dev.c
@@ -204,6 +204,7 @@ static const struct vfio_device_ops pds_vfio_ops = {
 	.bind_iommufd = vfio_iommufd_physical_bind,
 	.unbind_iommufd = vfio_iommufd_physical_unbind,
 	.attach_ioas = vfio_iommufd_physical_attach_ioas,
+	.detach_ioas = vfio_iommufd_physical_detach_ioas,
 };
 
 const struct vfio_device_ops *pds_vfio_ops_info(void)
-- 
2.17.1