[PATCH ath-next] wifi: ath12k: fix truncated TX buffer DMA address in MSDU ext descriptor

[Baochen Qiang]

ath12k_wifi7_hal_tx_cmd_ext_desc_setup() programs the low 32 bits of the
TX buffer physical address into HAL_TX_MSDU_EXT_INFO0_BUF_PTR_LO but
hardcodes the high bits field HAL_TX_MSDU_EXT_INFO1_BUF_PTR_HI to 0x0.

dma_addr_t is 64-bit on platforms with CONFIG_ARCH_DMA_ADDR_T_64BIT, so
whenever a TX buffer is mapped above the 4 GB boundary the upper bits of
paddr are dropped and the firmware is handed a truncated address,
leading to potential TX failures.

Write the upper bits of paddr into BUF_PTR_HI to fix this issue.

Issue found during code review, compile tested only.

Fixes: d889913205cf ("wifi: ath12k: driver for Qualcomm Wi-Fi 7 devices")
Signed-off-by: Baochen Qiang <baochen.qiang at oss.qualcomm.com>
---
 drivers/net/wireless/ath/ath12k/wifi7/dp_tx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/ath/ath12k/wifi7/dp_tx.c b/drivers/net/wireless/ath/ath12k/wifi7/dp_tx.c
index d2749de44553..87edfcd3672d 100644
--- a/drivers/net/wireless/ath/ath12k/wifi7/dp_tx.c
+++ b/drivers/net/wireless/ath/ath12k/wifi7/dp_tx.c
@@ -20,7 +20,7 @@ ath12k_wifi7_hal_tx_cmd_ext_desc_setup(struct ath12k_base *ab,
 {
 	tcl_ext_cmd->info0 = le32_encode_bits(ti->paddr,
 					      HAL_TX_MSDU_EXT_INFO0_BUF_PTR_LO);
-	tcl_ext_cmd->info1 = le32_encode_bits(0x0,
+	tcl_ext_cmd->info1 = le32_encode_bits((u64)ti->paddr >> HAL_ADDR_MSB_REG_SHIFT,
 					      HAL_TX_MSDU_EXT_INFO1_BUF_PTR_HI) |
 			       le32_encode_bits(ti->data_len,
 						HAL_TX_MSDU_EXT_INFO1_BUF_LEN);

---
base-commit: 4fa10e991f77b4c929d1959900a6ed422b9e2ac5
change-id: 20260811-ath12k-truncated-tx-dma-addr-5f94d897db2d

Best regards,
-- 
Baochen Qiang <baochen.qiang at oss.qualcomm.com>