wifi: ath12k: fix ath12k_qmi_alloc_chunk() to handle too large allocations

If the requested memory chunk is too large, an error message is logged, but the
request continues to be processed. However, no actual memory is allocated to
the firmware from this request. Instead, the firmware sends another request
with smaller chunks, where memory will be allocated accordingly. Therefore, it
is pointless to proceed with parsing the request if at least one of the
requests cannot be fulfilled.

Hence, return -EAGAIN immediately and proceed to process the new request.

Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.3.1-00173-QCAHKSWPL_SILICONZ-1
Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0.c5-00481-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3

Signed-off-by: Aditya Kumar Singh <quic_adisi@quicinc.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://patch.msgid.link/20241209185421.376381-8-kvalo@kernel.org
Signed-off-by: Jeff Johnson <jeff.johnson@oss.qualcomm.com>

diff --git a/drivers/net/wireless/ath/ath12k/qmi.c b/drivers/net/wireless/ath/ath12k/qmi.c
index e7846aaca10a5ee22b9fe9fbbf2bd52a2186789e..964d350be748a220d23bce39e26d6f4e9483e4bd 100644 (file)
--- a/drivers/net/wireless/ath/ath12k/qmi.c
+++ b/drivers/net/wireless/ath/ath12k/qmi.c
@@ -2497,7 +2497,7 @@ static int ath12k_qmi_alloc_chunk(struct ath12k_base *ab,
                                    chunk->size,
                                    chunk->type);
                        ath12k_qmi_free_target_mem_chunk(ab);
-                       return 0;
+                       return -EAGAIN;
                }
                ath12k_warn(ab, "memory allocation failure for %u size: %d\n",
                            chunk->type, chunk->size);
@@ -2600,6 +2600,14 @@ err:
 
        mutex_unlock(&ag->mutex);
 
+       /* The firmware will attempt to request memory in smaller chunks
+        * on the next try. However, the current caller should be notified
+        * that this instance of request parsing was successful.
+        * Therefore, return 0 only.
+        */
+       if (ret == -EAGAIN)
+               ret = 0;
+
        return ret;
 }