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wifi: brcmfmac: map msgbuf RX packet IDs bidirectional

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Commit f0ba5fd51f ("wifi: brcmfmac: Set DMA direction for msgbuf
packet IDs") maps the RX packet ID buffers DMA_FROM_DEVICE. The
BCM4364 firmware also reads posted RX buffers, so with VT-d
translation enabled every such read faults ("PTE Read access is not
set") and the firmware crashes and resets in a loop.

Map the RX pool DMA_BIDIRECTIONAL again, as before that commit. TX
keeps DMA_TO_DEVICE.

Fixes: f0ba5fd51f ("wifi: brcmfmac: Set DMA direction for msgbuf packet IDs")
Cc: stable@vger.kernel.org
Signed-off-by: Jason Perlow <jperlow@gmail.com>
Signed-off-by: Aditya Garg <aditya.garg@linux.dev>
Acked-by: Arend van Spriel <arend.vanspriel@broadcom.com>
Link: https://patch.msgid.link/20261021172238.10004-1-aditya.garg@linux.dev
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Jason Perlow 2026-10-21 22:52:38 +05:30 committed by Johannes Berg
parent 35c5a5ea44
commit 7ed5dce55f
1 changed files with 1 additions and 1 deletions
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2
drivers/net/wireless/broadcom/brcm80211/brcmfmac/msgbuf.c
View File

@ -1639,7 +1639,7 @@ int brcmf_proto_msgbuf_attach(struct brcmf_pub *drvr)
if (!msgbuf->tx_pktids)
goto fail;
msgbuf->rx_pktids = brcmf_msgbuf_init_pktids(NR_RX_PKTIDS,
DMA_FROM_DEVICE);
DMA_BIDIRECTIONAL);
if (!msgbuf->rx_pktids)
goto fail;