4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: "Mintz, Yuval" <Yuval.Mintz@xxxxxxxxxx>
[ Upstream commit 6f437d431930ff86e4a971d29321951faadb97c7 ]
Commit 653d2ffd6405 ("qed*: Fix link indication race") introduced another
race - one of the inner functions called from the link-change flow is
explicitly using the slowpath context dedicated PTT instead of gaining
that PTT from the caller. Since this flow can now be called from
a different context as well, we're in risk of the PTT breaking.
Fixes: 653d2ffd6405 ("qed*: Fix link indication race")
Signed-off-by: Yuval Mintz <Yuval.Mintz@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/ethernet/qlogic/qed/qed.h | 4 +++-
drivers/net/ethernet/qlogic/qed/qed_dev.c | 6 +++---
drivers/net/ethernet/qlogic/qed/qed_mcp.c | 3 ++-
3 files changed, 8 insertions(+), 5 deletions(-)
--- a/drivers/net/ethernet/qlogic/qed/qed.h
+++ b/drivers/net/ethernet/qlogic/qed/qed.h
@@ -642,7 +642,9 @@ static inline u8 qed_concrete_to_sw_fid(
#define OOO_LB_TC 9
int qed_configure_vport_wfq(struct qed_dev *cdev, u16 vp_id, u32 rate);
-void qed_configure_vp_wfq_on_link_change(struct qed_dev *cdev, u32 min_pf_rate);
+void qed_configure_vp_wfq_on_link_change(struct qed_dev *cdev,
+ struct qed_ptt *p_ptt,
+ u32 min_pf_rate);
void qed_clean_wfq_db(struct qed_hwfn *p_hwfn, struct qed_ptt *p_ptt);
#define QED_LEADING_HWFN(dev) (&dev->hwfns[0])
--- a/drivers/net/ethernet/qlogic/qed/qed_dev.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_dev.c
@@ -2732,7 +2732,8 @@ int qed_configure_vport_wfq(struct qed_d
}
/* API to configure WFQ from mcp link change */
-void qed_configure_vp_wfq_on_link_change(struct qed_dev *cdev, u32 min_pf_rate)
+void qed_configure_vp_wfq_on_link_change(struct qed_dev *cdev,
+ struct qed_ptt *p_ptt, u32 min_pf_rate)
{
int i;
@@ -2746,8 +2747,7 @@ void qed_configure_vp_wfq_on_link_change
for_each_hwfn(cdev, i) {
struct qed_hwfn *p_hwfn = &cdev->hwfns[i];
- __qed_configure_vp_wfq_on_link_change(p_hwfn,
- p_hwfn->p_dpc_ptt,
+ __qed_configure_vp_wfq_on_link_change(p_hwfn, p_ptt,
min_pf_rate);
}
}
--- a/drivers/net/ethernet/qlogic/qed/qed_mcp.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_mcp.c
@@ -628,7 +628,8 @@ static void qed_mcp_handle_link_change(s
/* Min bandwidth configuration */
__qed_configure_pf_min_bandwidth(p_hwfn, p_ptt, p_link, min_bw);
- qed_configure_vp_wfq_on_link_change(p_hwfn->cdev, p_link->min_pf_rate);
+ qed_configure_vp_wfq_on_link_change(p_hwfn->cdev, p_ptt,
+ p_link->min_pf_rate);
p_link->an = !!(status & LINK_STATUS_AUTO_NEGOTIATE_ENABLED);
p_link->an_complete = !!(status &