wifi: ath12k: fix truncated TX buffer DMA address in MSDU ext descriptor

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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: d889913205 ("wifi: ath12k: driver for Qualcomm Wi-Fi 7 devices")
Signed-off-by: Baochen Qiang <baochen.qiang@oss.qualcomm.com>
Reviewed-by: Rameshkumar Sundaram <rameshkumar.sundaram@oss.qualcomm.com>
Link: https://patch.msgid.link/20260818-ath12k-truncated-tx-dma-addr-v1-1-ead978969371@oss.qualcomm.com
Signed-off-by: Jeff Johnson <jeff.johnson@oss.qualcomm.com>

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Baochen Qiang 2026-08-18 10:03:41 +08:00 • committed by Jeff Johnson

parent 6c40719489

commit 979ecb88ed

1 changed files with 1 additions and 1 deletions

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drivers/net/wireless/ath/ath12k/wifi7/dp_tx.c

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