[PATCH ath-next v3 1/2] wifi: ath12k: report size 0 for unsupported target memory types

[Goran Sustek <gsustek@gmail.com>]

For a target memory segment of an unsupported type,
ath12k_qmi_alloc_target_mem_chunk() warns, clears the DMA address in
chunk->paddr and keeps the requested size. The response then carries
address 0 with a non-zero size for that segment.

QCN9274 firmware WLAN.WBE.1.6-01243 requests such a segment at every
boot: type 0xa (QMI_WLFW_AFC_MEM_V01), 8 KiB for an Automated Frequency
Coordination response, which ath12k does not support:

  ath12k_wifi7_pci 0000:06:00.0: memory type 10 not supported

The firmware treats a non-zero size as a provided region and maps the
given address. Nothing visible follows with this firmware: memory ready,
firmware ready and all radios come up with or without this change. The
response is still wrong, since it claims a region the host did not
provide.

Clear the size as well, so that an unsupported type is answered with
address 0 and size 0, which the firmware treats as not provided. The
warning is unchanged.

Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.6-01243-QCAHKSWPL_SILICONZ-1
Signed-off-by: Goran Sustek <gsustek@gmail.com>
---
v3: size cleared in the default case, no AFC case; warning kept;
    message reworded (Rameshkumar Sundaram)
v2: no allocation, size 0 (Rameshkumar Sundaram)

 drivers/net/wireless/ath/ath12k/qmi.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/wireless/ath/ath12k/qmi.c b/drivers/net/wireless/ath/ath12k/qmi.c
index 52a925fc44ee..4aaee5870ae9 100644
--- a/drivers/net/wireless/ath/ath12k/qmi.c
+++ b/drivers/net/wireless/ath/ath12k/qmi.c
@@ -2792,6 +2792,7 @@ static int ath12k_qmi_alloc_target_mem_chunk(struct ath12k_base *ab)
 				    chunk->type);
 			chunk->paddr = 0;
 			chunk->v.addr = NULL;
+			chunk->size = 0;
 			break;
 		}
 	}
-- 
2.56.0