From: Daniel Pieczko <dpiec...@solarflare.com>
The ifenslave command to set up a bond runs in an atomic
context, and it queries the stats on the devices that are
being enslaved. A VF needs to make an MCDI call to update
its stats, which is not allowed in atomic context.
The releasing of the stats_lock is moved to the beginning of
the VF stats update function so that in_interrupt() can be
used; it must be taken again before returning from this
function.
Signed-off-by: Shradha Shah <ss...@solarflare.com>
---
drivers/net/ethernet/sfc/ef10.c | 16 ++++++++++++++--
1 file changed, 14 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/sfc/ef10.c b/drivers/net/ethernet/sfc/ef10.c
index 8be9191..859980d 100644
--- a/drivers/net/ethernet/sfc/ef10.c
+++ b/drivers/net/ethernet/sfc/ef10.c
@@ -1320,11 +1320,24 @@ static int efx_ef10_try_update_nic_stats_vf(struct
efx_nic *efx)
__le64 *dma_stats;
int rc;
+ spin_unlock_bh(&efx->stats_lock);
+
+ if (in_interrupt()) {
+ /* If in atomic context, cannot update stats. Just update the
+ * software stats and return so the caller can continue.
+ */
+ spin_lock_bh(&efx->stats_lock);
+ efx_update_sw_stats(efx, stats);
+ return 0;
+ }
+
efx_ef10_get_stat_mask(efx, mask);
rc = efx_nic_alloc_buffer(efx, &stats_buf, dma_len, GFP_ATOMIC);
- if (rc)
+ if (rc) {
+ spin_lock_bh(&efx->stats_lock);
return rc;
+ }
dma_stats = stats_buf.addr;
dma_stats[MC_CMD_MAC_GENERATION_END] = EFX_MC_STATS_GENERATION_INVALID;
@@ -1335,7 +1348,6 @@ static int efx_ef10_try_update_nic_stats_vf(struct
efx_nic *efx)
MCDI_SET_DWORD(inbuf, MAC_STATS_IN_DMA_LEN, dma_len);
MCDI_SET_DWORD(inbuf, MAC_STATS_IN_PORT_ID, EVB_PORT_ID_ASSIGNED);
- spin_unlock_bh(&efx->stats_lock);
rc = efx_mcdi_rpc_quiet(efx, MC_CMD_MAC_STATS, inbuf, sizeof(inbuf),
NULL, 0, NULL);
spin_lock_bh(&efx->stats_lock);
--
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