linux-kernel - [PATCH RFC 2/2] PCI: endpoint: Fix that API pci_epc_remove

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Message-Id: <20241102-epc_rfc-v1-2-5026322df5bc@quicinc.com>
Date: Sat, 02 Nov 2024 22:26:15 +0800
From: Zijun Hu <zijun_hu@...oud.com>
To: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>, 
 Krzysztof Wilczyński <kw@...ux.com>, 
 Kishon Vijay Abraham I <kishon@...nel.org>, 
 Bjorn Helgaas <bhelgaas@...gle.com>, Frank Li <Frank.Li@....com>, 
 Lorenzo Pieralisi <lpieralisi@...nel.org>
Cc: Zijun Hu <zijun_hu@...oud.com>, 
 Krzysztof Wilczyński <kwilczynski@...nel.org>, 
 linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Zijun Hu <quic_zijuhu@...cinc.com>, stable@...r.kernel.org
Subject: [PATCH RFC 2/2] PCI: endpoint: Fix that API pci_epc_remove_epf()
 cleans up wrong EPC of EPF

From: Zijun Hu <quic_zijuhu@...cinc.com>

It is wrong for pci_epc_remove_epf(..., epf, SECONDARY_INTERFACE) to
clean up @epf->epc.

Fixed by cleaning up @epf->sec_epc instead of @epf->epc for
SECONDARY_INTERFACE.

Fixes: 63840ff53223 ("PCI: endpoint: Add support to associate secondary EPC with EPF")
Cc: stable@...r.kernel.org
Signed-off-by: Zijun Hu <quic_zijuhu@...cinc.com>
---
 drivers/pci/endpoint/pci-epc-core.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c
index bcc9bc3d6df5..62f7dff43730 100644
--- a/drivers/pci/endpoint/pci-epc-core.c
+++ b/drivers/pci/endpoint/pci-epc-core.c
@@ -660,18 +660,18 @@ void pci_epc_remove_epf(struct pci_epc *epc, struct pci_epf *epf,
 	if (IS_ERR_OR_NULL(epc) || !epf)
 		return;
 
+	mutex_lock(&epc->list_lock);
 	if (type == PRIMARY_INTERFACE) {
 		func_no = epf->func_no;
 		list = &epf->list;
+		epf->epc = NULL;
 	} else {
 		func_no = epf->sec_epc_func_no;
 		list = &epf->sec_epc_list;
+		epf->sec_epc = NULL;
 	}
-
-	mutex_lock(&epc->list_lock);
 	clear_bit(func_no, &epc->function_num_map);
 	list_del(list);
-	epf->epc = NULL;
 	mutex_unlock(&epc->list_lock);
 }
 EXPORT_SYMBOL_GPL(pci_epc_remove_epf);

-- 
2.34.1