diff mbox series

wifi: ath12k: check M3 buffer size as well whey trying to reuse it

Message ID 20240425021740.29221-1-quic_bqiang@quicinc.com
State New
Headers show
Series wifi: ath12k: check M3 buffer size as well whey trying to reuse it | expand

Commit Message

Baochen Qiang April 25, 2024, 2:17 a.m. UTC
Currently in recovery/resume cases, we do not free M3 buffer but
instead will reuse it. This is done by checking m3_mem->vaddr: if it
is not NULL we believe M3 buffer is ready and go ahead to reuse it.

Note that m3_mem->size is not checked. This is safe for now because
currently M3 reuse logic only gets executed in recovery/resume cases
and the size keeps unchanged in either of them.

However ideally the size should be checked as well, to make the code
safer. So add the check there. Now if that check fails, free old M3
buffer and reallocate a new one.

Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3.6510.30

Fixes: 303c017821d8 ("wifi: ath12k: fix kernel crash during resume")
Signed-off-by: Baochen Qiang <quic_bqiang@quicinc.com>
---
 drivers/net/wireless/ath/ath12k/qmi.c | 36 ++++++++++++++++-----------
 1 file changed, 21 insertions(+), 15 deletions(-)


base-commit: 326f8f68f28b0b831233acfabffb486a5b0f4717

Comments

Kalle Valo April 30, 2024, 1:34 p.m. UTC | #1
Baochen Qiang <quic_bqiang@quicinc.com> wrote:

> Currently in recovery/resume cases, we do not free M3 buffer but
> instead will reuse it. This is done by checking m3_mem->vaddr: if it
> is not NULL we believe M3 buffer is ready and go ahead to reuse it.
> 
> Note that m3_mem->size is not checked. This is safe for now because
> currently M3 reuse logic only gets executed in recovery/resume cases
> and the size keeps unchanged in either of them.
> 
> However ideally the size should be checked as well, to make the code
> safer. So add the check there. Now if that check fails, free old M3
> buffer and reallocate a new one.
> 
> Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3.6510.30
> 
> Fixes: 303c017821d8 ("wifi: ath12k: fix kernel crash during resume")
> Signed-off-by: Baochen Qiang <quic_bqiang@quicinc.com>
> Acked-by: Jeff Johnson <quic_jjohnson@quicinc.com>
> Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>

Patch applied to ath-next branch of ath.git, thanks.

05090ae82f44 wifi: ath12k: check M3 buffer size as well whey trying to reuse it
diff mbox series

Patch

diff --git a/drivers/net/wireless/ath/ath12k/qmi.c b/drivers/net/wireless/ath/ath12k/qmi.c
index ebb20fc8e3ba..5484112859a6 100644
--- a/drivers/net/wireless/ath/ath12k/qmi.c
+++ b/drivers/net/wireless/ath/ath12k/qmi.c
@@ -2717,6 +2717,19 @@  static int ath12k_qmi_load_bdf_qmi(struct ath12k_base *ab,
 	return ret;
 }
 
+static void ath12k_qmi_m3_free(struct ath12k_base *ab)
+{
+	struct m3_mem_region *m3_mem = &ab->qmi.m3_mem;
+
+	if (!m3_mem->vaddr)
+		return;
+
+	dma_free_coherent(ab->dev, m3_mem->size,
+			  m3_mem->vaddr, m3_mem->paddr);
+	m3_mem->vaddr = NULL;
+	m3_mem->size = 0;
+}
+
 static int ath12k_qmi_m3_load(struct ath12k_base *ab)
 {
 	struct m3_mem_region *m3_mem = &ab->qmi.m3_mem;
@@ -2747,8 +2760,14 @@  static int ath12k_qmi_m3_load(struct ath12k_base *ab)
 		m3_len = fw->size;
 	}
 
-	if (m3_mem->vaddr)
-		goto skip_m3_alloc;
+	/* In recovery/resume cases, M3 buffer is not freed, try to reuse that */
+	if (m3_mem->vaddr) {
+		if (m3_mem->size >= m3_len)
+			goto skip_m3_alloc;
+
+		/* Old buffer is too small, free and reallocate */
+		ath12k_qmi_m3_free(ab);
+	}
 
 	m3_mem->vaddr = dma_alloc_coherent(ab->dev,
 					   m3_len, &m3_mem->paddr,
@@ -2772,19 +2791,6 @@  static int ath12k_qmi_m3_load(struct ath12k_base *ab)
 	return ret;
 }
 
-static void ath12k_qmi_m3_free(struct ath12k_base *ab)
-{
-	struct m3_mem_region *m3_mem = &ab->qmi.m3_mem;
-
-	if (!m3_mem->vaddr)
-		return;
-
-	dma_free_coherent(ab->dev, m3_mem->size,
-			  m3_mem->vaddr, m3_mem->paddr);
-	m3_mem->vaddr = NULL;
-	m3_mem->size = 0;
-}
-
 static int ath12k_qmi_wlanfw_m3_info_send(struct ath12k_base *ab)
 {
 	struct m3_mem_region *m3_mem = &ab->qmi.m3_mem;