The .ndo_get_stats64 callback must not sleep because it can be
called when reading /proc/net/dev.
rtase_get_stats64() calls rtase_dump_tally_counter(), which polls
the tally counter dump bit with read_poll_timeout(). This may
sleep while waiting for the hardware counter dump to complete.
Use read_poll_timeout_atomic() instead to avoid sleeping in the
get_stats64() path.
Fixes: 079600489960 ("rtase: Implement net_device_ops")
Cc: stable@vger.kernel.org
Signed-off-by: Justin Lai <justinlai0215@realtek.com>
---
v1 -> v2:
- Target net tree.
- Add Fixes tag.
- Add Cc: stable@vger.kernel.org.
---
drivers/net/ethernet/realtek/rtase/rtase_main.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/realtek/rtase/rtase_main.c b/drivers/net/ethernet/realtek/rtase/rtase_main.c
index 6ccbefb5acf2..55105d34bc79 100644
--- a/drivers/net/ethernet/realtek/rtase/rtase_main.c
+++ b/drivers/net/ethernet/realtek/rtase/rtase_main.c
@@ -1565,8 +1565,9 @@ static void rtase_dump_tally_counter(const struct rtase_private *tp)
rtase_w32(tp, RTASE_DTCCR0, cmd);
rtase_w32(tp, RTASE_DTCCR0, cmd | RTASE_COUNTER_DUMP);
- err = read_poll_timeout(rtase_r32, val, !(val & RTASE_COUNTER_DUMP),
- 10, 250, false, tp, RTASE_DTCCR0);
+ err = read_poll_timeout_atomic(rtase_r32, val,
+ !(val & RTASE_COUNTER_DUMP),
+ 10, 250, false, tp, RTASE_DTCCR0);
if (err == -ETIMEDOUT)
netdev_err(tp->dev, "error occurred in dump tally counter\n");
--
2.40.1