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Subject[PATCH -next v2] PCI: endpoint: pci-epf-vntb: fix error handle in epf_ntb_mw_bar_init()
Date
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>
---
v2:
add error label err_set_bar and move pci_epc_clear_bar() to it
---
drivers/pci/endpoint/functions/pci-epf-vntb.c | 20 ++++++++++++++-----
1 file changed, 15 insertions(+), 5 deletions(-)

diff --git a/drivers/pci/endpoint/functions/pci-epf-vntb.c b/drivers/pci/endpoint/functions/pci-epf-vntb.c
index ebf7e243eefa..ee9fee167d48 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
@@ -625,13 +627,21 @@ static int epf_ntb_mw_bar_init(struct epf_ntb *ntb)
&ntb->vpci_mw_phy[i],
size);
if (!ntb->vpci_mw_addr[i]) {
+ ret = -ENOMEM;
dev_err(dev, "Failed to allocate source address\n");
- goto err_alloc_mem;
+ goto err_set_bar;
}
}

return ret;
+
+err_set_bar:
+ pci_epc_clear_bar(ntb->epf->epc,
+ ntb->epf->func_no,
+ ntb->epf->vfunc_no,
+ &ntb->epf->bar[barno]);
err_alloc_mem:
+ epf_ntb_mw_bar_clear(ntb, i);
return ret;
}

@@ -640,12 +650,12 @@ 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 +784,7 @@ 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 +804,7 @@ 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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