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From: Koichiro Den <den@valinux.co.jp>
To: ntb@lists.linux.dev, linux-pci@vger.kernel.org,
	linux-kernel@vger.kernel.org
Cc: jdmason@kudzu.us, dave.jiang@intel.com, allenbh@gmail.com,
	mani@kernel.org, kwilczynski@kernel.org, kishon@kernel.org,
	bhelgaas@google.com, jbrunet@baylibre.com, Frank.Li@nxp.com,
	lpieralisi@kernel.org, yebin10@huawei.com,
	geert+renesas@glider.be, arnd@arndb.de
Subject: [PATCH v2 3/6] PCI: endpoint: pci-epf-vntb: Remove duplicate resource teardown
Date: Wed, 29 Oct 2025 17:03:18 +0900	[thread overview]
Message-ID: <20251029080321.807943-4-den@valinux.co.jp> (raw)
In-Reply-To: <20251029080321.807943-1-den@valinux.co.jp>

epf_ntb_epc_destroy() duplicates the teardown that the caller is
supposed to perform later. This leads to an oops when .allow_link fails
or when .drop_link is performed. The following is an example oops of the
former case:

  Unable to handle kernel paging request at virtual address dead000000000108
  [...]
  [dead000000000108] address between user and kernel address ranges
  Internal error: Oops: 0000000096000044 [#1]  SMP
  [...]
  Call trace:
   pci_epc_remove_epf+0x78/0xe0 (P)
   pci_primary_epc_epf_link+0x88/0xa8
   configfs_symlink+0x1f4/0x5a0
   vfs_symlink+0x134/0x1d8
   do_symlinkat+0x88/0x138
   __arm64_sys_symlinkat+0x74/0xe0
  [...]

Remove the helper, and drop pci_epc_put(). EPC device refcounting is
tied to the configfs EPC group lifetime, and pci_epc_put() in the
.drop_link path is sufficient.

Cc: <stable@vger.kernel.org>
Fixes: e35f56bb0330 ("PCI: endpoint: Support NTB transfer between RC and EP")
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Koichiro Den <den@valinux.co.jp>
---
 drivers/pci/endpoint/functions/pci-epf-vntb.c | 19 +------------------
 1 file changed, 1 insertion(+), 18 deletions(-)

diff --git a/drivers/pci/endpoint/functions/pci-epf-vntb.c b/drivers/pci/endpoint/functions/pci-epf-vntb.c
index 83e9ab10f9c4..49ce5d4b0ee5 100644
--- a/drivers/pci/endpoint/functions/pci-epf-vntb.c
+++ b/drivers/pci/endpoint/functions/pci-epf-vntb.c
@@ -644,19 +644,6 @@ static void epf_ntb_mw_bar_clear(struct epf_ntb *ntb, int num_mws)
 	}
 }
 
-/**
- * epf_ntb_epc_destroy() - Cleanup NTB EPC interface
- * @ntb: NTB device that facilitates communication between HOST and VHOST
- *
- * Wrapper for epf_ntb_epc_destroy_interface() to cleanup all the NTB interfaces
- */
-static void epf_ntb_epc_destroy(struct epf_ntb *ntb)
-{
-	pci_epc_remove_epf(ntb->epf->epc, ntb->epf, 0);
-	pci_epc_put(ntb->epf->epc);
-}
-
-
 /**
  * epf_ntb_is_bar_used() - Check if a bar is used in the ntb configuration
  * @ntb: NTB device that facilitates communication between HOST and VHOST
@@ -1406,7 +1393,7 @@ static int epf_ntb_bind(struct pci_epf *epf)
 	ret = epf_ntb_init_epc_bar(ntb);
 	if (ret) {
 		dev_err(dev, "Failed to create NTB EPC\n");
-		goto err_bar_init;
+		return ret;
 	}
 
 	ret = epf_ntb_config_spad_bar_alloc(ntb);
@@ -1446,9 +1433,6 @@ static int epf_ntb_bind(struct pci_epf *epf)
 err_bar_alloc:
 	epf_ntb_config_spad_bar_free(ntb);
 
-err_bar_init:
-	epf_ntb_epc_destroy(ntb);
-
 	return ret;
 }
 
@@ -1464,7 +1448,6 @@ static void epf_ntb_unbind(struct pci_epf *epf)
 
 	epf_ntb_epc_cleanup(ntb);
 	epf_ntb_config_spad_bar_free(ntb);
-	epf_ntb_epc_destroy(ntb);
 
 	pci_unregister_driver(&vntb_pci_driver);
 }
-- 
2.48.1


  parent reply	other threads:[~2025-10-29  8:03 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-10-29  8:03 [PATCH v2 0/6] PCI: endpoint/NTB: Harden vNTB resource management Koichiro Den
2025-10-29  8:03 ` [PATCH v2 1/6] NTB: epf: Avoid pci_iounmap() with offset when PEER_SPAD and CONFIG share BAR Koichiro Den
2025-10-29  8:03 ` [PATCH v2 2/6] PCI: endpoint: Fix parameter order for .drop_link Koichiro Den
2025-10-29  8:03 ` Koichiro Den [this message]
2025-10-29  8:03 ` [PATCH v2 4/6] PCI: endpoint: pci-epf-ntb: Remove duplicate resource teardown Koichiro Den
2025-10-29 16:48   ` Frank Li
2025-10-29  8:03 ` [PATCH v2 5/6] NTB: epf: vntb: Stop cmd_handler work in epf_ntb_epc_cleanup Koichiro Den
2025-10-29  8:03 ` [PATCH v2 6/6] PCI: endpoint: pci-epf-vntb: manage ntb_dev lifetime and fix vpci bus teardown Koichiro Den
2025-10-29 16:53   ` Frank Li
2025-10-30  2:20     ` Koichiro Den
2025-10-31 19:52       ` Frank Li
2025-11-04  1:13         ` Koichiro Den

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