From: Johan Hovold <johan+linaro@kernel.org>
To: Jeff Johnson <jjohnson@kernel.org>
Cc: Miaoqing Pan <quic_miaoqing@quicinc.com>,
Remi Pommarel <repk@triplefau.lt>,
Baochen Qiang <quic_bqiang@quicinc.com>,
linux-wireless@vger.kernel.org, ath12k@lists.infradead.org,
linux-kernel@vger.kernel.org,
Johan Hovold <johan+linaro@kernel.org>
Subject: [PATCH v3 2/4] wifi: ath12k: use plain access for descriptor length
Date: Tue, 17 Jun 2025 10:44:00 +0200 [thread overview]
Message-ID: <20250617084402.14475-3-johan+linaro@kernel.org> (raw)
In-Reply-To: <20250617084402.14475-1-johan+linaro@kernel.org>
The read memory barrier added by commit 6b67d2cf14ea ("wifi: ath12k: fix
ring-buffer corruption") is enough to guarantee ordering also for plain
descriptor accesses if the length helper is ever inlined so drop the
unnecessary READ_ONCE().
Tested-on: WCN7850 hw2.0 WLAN.HMT.1.0.c5-00481-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
---
drivers/net/wireless/ath/ath12k/hal.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/wireless/ath/ath12k/hal.c b/drivers/net/wireless/ath/ath12k/hal.c
index f8bd3837b9dc..726969cfcaec 100644
--- a/drivers/net/wireless/ath/ath12k/hal.c
+++ b/drivers/net/wireless/ath/ath12k/hal.c
@@ -1950,7 +1950,7 @@ u32 ath12k_hal_ce_dst_status_get_length(struct hal_ce_srng_dst_status_desc *desc
{
u32 len;
- len = le32_get_bits(READ_ONCE(desc->flags), HAL_CE_DST_STATUS_DESC_FLAGS_LEN);
+ len = le32_get_bits(desc->flags, HAL_CE_DST_STATUS_DESC_FLAGS_LEN);
desc->flags &= ~cpu_to_le32(HAL_CE_DST_STATUS_DESC_FLAGS_LEN);
return len;
--
2.49.0
next prev parent reply other threads:[~2025-06-17 8:44 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-06-17 8:43 [PATCH v3 0/4] wifi: ath12k: fix dest ring-buffer corruption Johan Hovold
2025-06-17 8:43 ` [PATCH v3 1/4] " Johan Hovold
2025-06-25 1:53 ` Baochen Qiang
2025-06-17 8:44 ` Johan Hovold [this message]
2025-06-25 1:53 ` [PATCH v3 2/4] wifi: ath12k: use plain access for descriptor length Baochen Qiang
2025-06-17 8:44 ` [PATCH v3 3/4] wifi: ath12k: fix source ring-buffer corruption Johan Hovold
2025-06-25 1:54 ` Baochen Qiang
2025-06-17 8:44 ` [PATCH v3 4/4] wifi: ath12k: fix dest ring-buffer corruption when ring is full Johan Hovold
2025-06-25 1:54 ` Baochen Qiang
2025-06-26 23:15 ` [PATCH v3 0/4] wifi: ath12k: fix dest ring-buffer corruption Jeff Johnson
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