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charset="utf-8" After calling napi_complete_done(), the NAPIF_STATE_SCHED bit may be cleared, and another CPU can start napi thread and access per-CQ variable, cq->work_done. If the other thread (for example, from busy_poll) sets it to a value >=3D budget, this thread will continue to run when it should stop, and cause memory corruption and panic. To fix this issue, save the per-CQ work_done variable in a local variable before napi_complete_done(), so it won't be corrupted by a possible concurrent thread after napi_complete_done(). Also, add a flag bit to advertise to the NIC firmware: the NAPI work_done variable race is fixed, so the driver is able to reliably support features like busy_poll. Cc: stable@vger.kernel.org Fixes: e1b5683ff62e ("net: mana: Move NAPI from EQ to CQ") Signed-off-by: Haiyang Zhang --- drivers/net/ethernet/microsoft/mana/gdma.h | 9 ++++++++- drivers/net/ethernet/microsoft/mana/mana_en.c | 16 +++++++++++----- 2 files changed, 19 insertions(+), 6 deletions(-) diff --git a/drivers/net/ethernet/microsoft/mana/gdma.h b/drivers/net/ether= net/microsoft/mana/gdma.h index 4a6efe6ada08..65c24ee49efd 100644 --- a/drivers/net/ethernet/microsoft/mana/gdma.h +++ b/drivers/net/ethernet/microsoft/mana/gdma.h @@ -498,7 +498,14 @@ enum { =20 #define GDMA_DRV_CAP_FLAG_1_EQ_SHARING_MULTI_VPORT BIT(0) =20 -#define GDMA_DRV_CAP_FLAGS1 GDMA_DRV_CAP_FLAG_1_EQ_SHARING_MULTI_VPORT +/* Advertise to the NIC firmware: the NAPI work_done variable race is fixe= d, + * so the driver is able to reliably support features like busy_poll. + */ +#define GDMA_DRV_CAP_FLAG_1_NAPI_WKDONE_FIX BIT(2) + +#define GDMA_DRV_CAP_FLAGS1 \ + (GDMA_DRV_CAP_FLAG_1_EQ_SHARING_MULTI_VPORT | \ + GDMA_DRV_CAP_FLAG_1_NAPI_WKDONE_FIX) =20 #define GDMA_DRV_CAP_FLAGS2 0 =20 diff --git a/drivers/net/ethernet/microsoft/mana/mana_en.c b/drivers/net/et= hernet/microsoft/mana/mana_en.c index 9259a74eca40..27a0f3af8aab 100644 --- a/drivers/net/ethernet/microsoft/mana/mana_en.c +++ b/drivers/net/ethernet/microsoft/mana/mana_en.c @@ -1303,10 +1303,11 @@ static void mana_poll_rx_cq(struct mana_cq *cq) xdp_do_flush(); } =20 -static void mana_cq_handler(void *context, struct gdma_queue *gdma_queue) +static int mana_cq_handler(void *context, struct gdma_queue *gdma_queue) { struct mana_cq *cq =3D context; u8 arm_bit; + int w; =20 WARN_ON_ONCE(cq->gdma_cq !=3D gdma_queue); =20 @@ -1315,26 +1316,31 @@ static void mana_cq_handler(void *context, struct g= dma_queue *gdma_queue) else mana_poll_tx_cq(cq); =20 - if (cq->work_done < cq->budget && - napi_complete_done(&cq->napi, cq->work_done)) { + w =3D cq->work_done; + + if (w < cq->budget && + napi_complete_done(&cq->napi, w)) { arm_bit =3D SET_ARM_BIT; } else { arm_bit =3D 0; } =20 mana_gd_ring_cq(gdma_queue, arm_bit); + + return w; } =20 static int mana_poll(struct napi_struct *napi, int budget) { struct mana_cq *cq =3D container_of(napi, struct mana_cq, napi); + int w; =20 cq->work_done =3D 0; cq->budget =3D budget; =20 - mana_cq_handler(cq, cq->gdma_cq); + w =3D mana_cq_handler(cq, cq->gdma_cq); =20 - return min(cq->work_done, budget); + return min(w, budget); } =20 static void mana_schedule_napi(void *context, struct gdma_queue *gdma_queu= e) --=20 2.25.1