[PATCH RESEND] wifi: ath11k: release the rproc reference on teardown

[Wentao Liang <vulab@iscas.ac.cn>]

ath11k_core_get_rproc() looks up the target remoteproc with
rproc_get_by_phandle(), which takes a device reference and a reference on
the remoteproc driver's module.  The resulting pointer is stored in
ab_ahb->tgt_rproc and never released: ath11k_ahb_free_resources() only
tears down the firmware resources, and the probe error paths after the
lookup jump to err_core_free without dropping the reference either.
rproc_shutdown() does not release it, it only drops the power reference.

Release the reference when the AHB resources are freed and on the probe
error path, so that repeated bind/unbind cycles no longer accumulate
remoteproc references and the remoteproc module can be unloaded again.

Fixes: ba929d6fe31a ("ath11k: Remove rproc references from common core layer")
Cc: stable@vger.kernel.org
Assisted-by: DeepSeek-V4.1-Flash and OpenAI Codex
Signed-off-by: Wentao Liang <vulab@iscas.ac.cn>
---
 drivers/net/wireless/ath/ath11k/ahb.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/net/wireless/ath/ath11k/ahb.c b/drivers/net/wireless/ath/ath11k/ahb.c
index 27d01411b6e9..cc93ca22d3ff 100644
--- a/drivers/net/wireless/ath/ath11k/ahb.c
+++ b/drivers/net/wireless/ath/ath11k/ahb.c
@@ -852,6 +852,16 @@ static int ath11k_core_get_rproc(struct ath11k_base *ab)
 	return 0;
 }
 
+static void ath11k_core_put_rproc(struct ath11k_base *ab)
+{
+	struct ath11k_ahb *ab_ahb = ath11k_ahb_priv(ab);
+
+	if (ab_ahb->tgt_rproc) {
+		rproc_put(ab_ahb->tgt_rproc);
+		ab_ahb->tgt_rproc = NULL;
+	}
+}
+
 static int ath11k_ahb_setup_msi_resources(struct ath11k_base *ab)
 {
 	struct platform_device *pdev = ab->pdev;
@@ -1262,6 +1272,7 @@ static int ath11k_ahb_probe(struct platform_device *pdev)
 	ath11k_ahb_ce_unmap(ab);
 
 err_core_free:
+	ath11k_core_put_rproc(ab);
 	ath11k_core_free(ab);
 	platform_set_drvdata(pdev, NULL);
 
@@ -1295,6 +1306,7 @@ static void ath11k_ahb_free_resources(struct ath11k_base *ab)
 	ath11k_ce_free_pipes(ab);
 	ath11k_ahb_ce_unmap(ab);
 
+	ath11k_core_put_rproc(ab);
 	ath11k_core_free(ab);
 	platform_set_drvdata(pdev, NULL);
 }
-- 
2.34.1