wifi: ath11k: fix dest ring-buffer corruption when ring is full

commit aa6956150f820e6a6deba44be325ddfcb5b10f88 upstream.

Add the missing memory barriers to make sure that destination ring
descriptors are read before updating the tail pointer (and passing
ownership to the device) to avoid memory corruption on weakly ordered
architectures like aarch64 when the ring is full.

Tested-on: WCN6855 hw2.1 WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3.6510.41

Fixes: d5c65159f289 ("ath11k: driver for Qualcomm IEEE 802.11ax devices")
Cc: stable@vger.kernel.org      # 5.6
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Reviewed-by: Baochen Qiang <quic_bqiang@quicinc.com>
Link: https://patch.msgid.link/20250604143457.26032-6-johan+linaro@kernel.org
Signed-off-by: Jeff Johnson <jeff.johnson@oss.qualcomm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/wireless/ath/ath11k/hal.c b/drivers/net/wireless/ath/ath11k/hal.c
index 16607f5e3cd7dc01ca270a2d55794c72edfe5e94..d8b066946a090f4220182480cdaf2287af7ab434 100644 (file)
--- a/drivers/net/wireless/ath/ath11k/hal.c
+++ b/drivers/net/wireless/ath/ath11k/hal.c
@@ -854,7 +854,6 @@ void ath11k_hal_srng_access_end(struct ath11k_base *ab, struct hal_srng *srng)
 {
        lockdep_assert_held(&srng->lock);
 
-       /* TODO: See if we need a write memory barrier here */
        if (srng->flags & HAL_SRNG_FLAGS_LMAC_RING) {
                /* For LMAC rings, ring pointer updates are done through FW and
                 * hence written to a shared memory location that is read by FW
@@ -869,7 +868,11 @@ void ath11k_hal_srng_access_end(struct ath11k_base *ab, struct hal_srng *srng)
                        WRITE_ONCE(*srng->u.src_ring.hp_addr, srng->u.src_ring.hp);
                } else {
                        srng->u.dst_ring.last_hp = *srng->u.dst_ring.hp_addr;
-                       *srng->u.dst_ring.tp_addr = srng->u.dst_ring.tp;
+                       /* Make sure descriptor is read before updating the
+                        * tail pointer.
+                        */
+                       dma_mb();
+                       WRITE_ONCE(*srng->u.dst_ring.tp_addr, srng->u.dst_ring.tp);
                }
        } else {
                if (srng->ring_dir == HAL_SRNG_DIR_SRC) {
@@ -885,6 +888,10 @@ void ath11k_hal_srng_access_end(struct ath11k_base *ab, struct hal_srng *srng)
                                           srng->u.src_ring.hp);
                } else {
                        srng->u.dst_ring.last_hp = *srng->u.dst_ring.hp_addr;
+                       /* Make sure descriptor is read before updating the
+                        * tail pointer.
+                        */
+                       mb();
                        ath11k_hif_write32(ab,
                                           (unsigned long)srng->u.dst_ring.tp_addr -
                                           (unsigned long)ab->mem,