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SubjectRE: [PATCH -next] PCI: endpoint: pci-epf-vntb: fix error handle in epf_ntb_mw_bar_init()
Date


> -----Original Message-----
> From: Yang Yingliang <yangyingliang@huawei.com>
> Sent: Friday, June 24, 2022 4:46 AM
> To: linux-kernel@vger.kernel.org; linux-pci@vger.kernel.org
> Cc: Frank Li <frank.li@nxp.com>; jdmason@kudzu.us; kishon@ti.com;
> lpieralisi@kernel.org; kw@linux.com; bhelgaas@google.com
> Subject: [PATCH -next] PCI: endpoint: pci-epf-vntb: fix error handle in
> epf_ntb_mw_bar_init()
>
> In error case of epf_ntb_mw_bar_init(), memory window BARs should be
> cleared, so add 'num_mws' parameter in epf_ntb_mw_bar_clear() and
> calling it in error path to clear the BARs. Also add missing error
> code when pci_epc_mem_alloc_addr() fails.
>
> Fixes: ff32fac00d97 ("NTB: EPF: support NTB transfer between PCI RC and EP
> connection")
> Reported-by: Hulk Robot <hulkci@huawei.com>
> Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
> ---
> drivers/pci/endpoint/functions/pci-epf-vntb.c | 16 ++++++++++++----
> 1 file changed, 12 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/pci/endpoint/functions/pci-epf-vntb.c
> b/drivers/pci/endpoint/functions/pci-epf-vntb.c
> index ebf7e243eefa..d8ed640c16c4 100644
> --- a/drivers/pci/endpoint/functions/pci-epf-vntb.c
> +++ b/drivers/pci/endpoint/functions/pci-epf-vntb.c
> @@ -567,6 +567,8 @@ static int epf_ntb_db_bar_init(struct epf_ntb *ntb)
> return -1;
> }
>
> +static void epf_ntb_mw_bar_clear(struct epf_ntb *ntb, int num_mws);
> +
> /**
> * epf_ntb_db_bar_clear() - Clear doorbell BAR and free memory
> * allocated in peers outbound address space
> @@ -625,6 +627,11 @@ static int epf_ntb_mw_bar_init(struct epf_ntb *ntb)
> &ntb-
> >vpci_mw_phy[i],
> size);
> if (!ntb->vpci_mw_addr[i]) {
> + pci_epc_clear_bar(ntb->epf->epc,
> + ntb->epf->func_no,
> + ntb->epf->vfunc_no,
> + &ntb->epf->bar[barno]);
> + ret = -ENOMEM;

This function move to goto and keep consistent of error handle.

Suggest:
Goto err_set_bar

....
Error_set_bar:
Pci_epc_clear_bar();

> dev_err(dev, "Failed to allocate source address\n");
> goto err_alloc_mem;
> }
> @@ -632,6 +639,7 @@ static int epf_ntb_mw_bar_init(struct epf_ntb *ntb)
>
> return ret;
> err_alloc_mem:
> + epf_ntb_mw_bar_clear(ntb, i);
> return ret;
> }
>
> @@ -640,12 +648,12 @@ static int epf_ntb_mw_bar_init(struct epf_ntb *ntb)
> * @ntb: NTB device that facilitates communication between HOST and
> vHOST
> *
> */
> -static void epf_ntb_mw_bar_clear(struct epf_ntb *ntb)
> +static void epf_ntb_mw_bar_clear(struct epf_ntb *ntb, int num_mws)
> {
> enum pci_barno barno;
> int i;
>
> - for (i = 0; i < ntb->num_mws; i++) {
> + for (i = 0; i < num_mws; i++) {
> barno = ntb->epf_ntb_bar[BAR_MW0 + i];
> pci_epc_clear_bar(ntb->epf->epc,
> ntb->epf->func_no,
> @@ -774,7 +782,7 @@ static int epf_ntb_epc_init(struct epf_ntb *ntb)
> return 0;
>
> err_write_header:
> - epf_ntb_mw_bar_clear(ntb);
> + epf_ntb_mw_bar_clear(ntb, ntb->num_mws);
> err_mw_bar_init:
> epf_ntb_db_bar_clear(ntb);
> err_db_bar_init:
> @@ -794,7 +802,7 @@ static int epf_ntb_epc_init(struct epf_ntb *ntb)
> static void epf_ntb_epc_cleanup(struct epf_ntb *ntb)
> {
> epf_ntb_db_bar_clear(ntb);
> - epf_ntb_mw_bar_clear(ntb);
> + epf_ntb_mw_bar_clear(ntb, ntb->num_mws);
> }
>
> #define EPF_NTB_R(_name) \
> --
> 2.25.1

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