linux-kernel - [PATCH 4.14 081/100] PCI: endpoint: Populate func_no before calling pci_epc_add

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Message-Id: <20181129140105.765963444@linuxfoundation.org>
Date:   Thu, 29 Nov 2018 15:12:51 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Niklas Cassel <niklas.cassel@...s.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Kishon Vijay Abraham I <kishon@...com>,
        Sudip Mukherjee <sudipm.mukherjee@...il.com>
Subject: [PATCH 4.14 081/100] PCI: endpoint: Populate func_no before calling pci_epc_add_epf()

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Niklas Cassel <niklas.cassel@...s.com>

commit 0c47cd7a9b6c9c36c08113e594e9ad017fb17865 upstream.

func_no is a member of struct pci_epf.

Since struct pci_epf is used as an argument to pci_epc_add_epf() (to
bind an endpoint function to a controller), struct pci_epf.func_no
should be populated before calling pci_epc_add_epf().

Initialize the struct pci_epf.func_no member before calling
pci_epc_add_epf(), to fix the endpoint function binding to
an endpoint controller.

Fixes: d74679911610 ("PCI: endpoint: Introduce configfs entry for configuring EP functions")
Signed-off-by: Niklas Cassel <niklas.cassel@...s.com>
[lorenzo.pieralisi@....com: rewrote the commit log]
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Suggested-by: Kishon Vijay Abraham I <kishon@...com>
Acked-by: Kishon Vijay Abraham I <kishon@...com>
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/pci/endpoint/pci-ep-cfs.c |   14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

--- a/drivers/pci/endpoint/pci-ep-cfs.c
+++ b/drivers/pci/endpoint/pci-ep-cfs.c
@@ -97,16 +97,10 @@ static int pci_epc_epf_link(struct confi
 {
 	int ret;
 	u32 func_no = 0;
-	struct pci_epc *epc;
-	struct pci_epf *epf;
 	struct pci_epf_group *epf_group = to_pci_epf_group(epf_item);
 	struct pci_epc_group *epc_group = to_pci_epc_group(epc_item);
-
-	epc = epc_group->epc;
-	epf = epf_group->epf;
-	ret = pci_epc_add_epf(epc, epf);
-	if (ret)
-		goto err_add_epf;
+	struct pci_epc *epc = epc_group->epc;
+	struct pci_epf *epf = epf_group->epf;
 
 	func_no = find_first_zero_bit(&epc_group->function_num_map,
 				      BITS_PER_LONG);
@@ -116,6 +110,10 @@ static int pci_epc_epf_link(struct confi
 	set_bit(func_no, &epc_group->function_num_map);
 	epf->func_no = func_no;
 
+	ret = pci_epc_add_epf(epc, epf);
+	if (ret)
+		goto err_add_epf;
+
 	ret = pci_epf_bind(epf);
 	if (ret)
 		goto err_epf_bind;