From c8ecfc1c33979054fb631d2066745d03ce322b6f Mon Sep 17 00:00:00 2001 From: Raja Mani Date: Wed, 29 Jul 2015 11:40:38 +0300 Subject: [PATCH] ath10k: fix memory alloc failure in qca99x0 during wmi svc rdy event Host memory required for firmware is allocated while handling wmi service ready event. Right now, wmi service ready is handled in tasklet context and it calls dma_alloc_coherent() with atomic flag (GFP_ATOMIC) to allocate memory in host needed for firmware. The problem is, dma_alloc_coherent() with GFP_ATOMIC fails in the platform (at least in AP platform) where it has less atomic pool memory (< 2mb). QCA99X0 requires around 2 MB of host memory for one card, having additional QCA99X0 card in the same platform will require similarly amount of memory. So, it's not guaranteed that all the platform will have enough atomic memory pool. Fix this issue, by handling wmi service ready event in workqueue context and calling dma_alloc_coherent() with GFP_KERNEL. mac80211 work queue will not be ready at the time of handling wmi service ready. So, it can't be used to handle wmi service ready. Also, register work gets scheduled during insmod in existing ath10k_wq and waits for wmi service ready to completed. Both workqueue can't be used for this purpose. New auxiliary workqueue is added to handle wmi service ready. Signed-off-by: Raja Mani Signed-off-by: Kalle Valo --- drivers/net/wireless/ath/ath10k/core.c | 11 +++++++- drivers/net/wireless/ath/ath10k/core.h | 5 ++++ drivers/net/wireless/ath/ath10k/wmi-tlv.c | 2 +- drivers/net/wireless/ath/ath10k/wmi.c | 34 +++++++++++++++++++---- 4 files changed, 44 insertions(+), 8 deletions(-) diff --git a/drivers/net/wireless/ath/ath10k/core.c b/drivers/net/wireless/ath/ath10k/core.c index 29d2541d87dd..25510679fd2e 100644 --- a/drivers/net/wireless/ath/ath10k/core.c +++ b/drivers/net/wireless/ath/ath10k/core.c @@ -1649,6 +1649,10 @@ struct ath10k *ath10k_core_create(size_t priv_size, struct device *dev, if (!ar->workqueue) goto err_free_mac; + ar->workqueue_aux = create_singlethread_workqueue("ath10k_aux_wq"); + if (!ar->workqueue_aux) + goto err_free_wq; + mutex_init(&ar->conf_mutex); spin_lock_init(&ar->data_lock); @@ -1669,10 +1673,12 @@ struct ath10k *ath10k_core_create(size_t priv_size, struct device *dev, ret = ath10k_debug_create(ar); if (ret) - goto err_free_wq; + goto err_free_aux_wq; return ar; +err_free_aux_wq: + destroy_workqueue(ar->workqueue_aux); err_free_wq: destroy_workqueue(ar->workqueue); @@ -1688,6 +1694,9 @@ void ath10k_core_destroy(struct ath10k *ar) flush_workqueue(ar->workqueue); destroy_workqueue(ar->workqueue); + flush_workqueue(ar->workqueue_aux); + destroy_workqueue(ar->workqueue_aux); + ath10k_debug_destroy(ar); ath10k_mac_destroy(ar); } diff --git a/drivers/net/wireless/ath/ath10k/core.h b/drivers/net/wireless/ath/ath10k/core.h index 35f40388b622..6a387bac27b0 100644 --- a/drivers/net/wireless/ath/ath10k/core.h +++ b/drivers/net/wireless/ath/ath10k/core.h @@ -694,6 +694,8 @@ struct ath10k { struct completion vdev_setup_done; struct workqueue_struct *workqueue; + /* Auxiliary workqueue */ + struct workqueue_struct *workqueue_aux; /* prevents concurrent FW reconfiguration */ struct mutex conf_mutex; @@ -716,6 +718,9 @@ struct ath10k { int num_active_peers; int num_tids; + struct work_struct svc_rdy_work; + struct sk_buff *svc_rdy_skb; + struct work_struct offchan_tx_work; struct sk_buff_head offchan_tx_queue; struct completion offchan_tx_completed; diff --git a/drivers/net/wireless/ath/ath10k/wmi-tlv.c b/drivers/net/wireless/ath/ath10k/wmi-tlv.c index 34fbc8fddb72..567b79720b69 100644 --- a/drivers/net/wireless/ath/ath10k/wmi-tlv.c +++ b/drivers/net/wireless/ath/ath10k/wmi-tlv.c @@ -519,7 +519,7 @@ static void ath10k_wmi_tlv_op_rx(struct ath10k *ar, struct sk_buff *skb) break; case WMI_TLV_SERVICE_READY_EVENTID: ath10k_wmi_event_service_ready(ar, skb); - break; + return; case WMI_TLV_READY_EVENTID: ath10k_wmi_event_ready(ar, skb); break; diff --git a/drivers/net/wireless/ath/ath10k/wmi.c b/drivers/net/wireless/ath/ath10k/wmi.c index 3d46813b9beb..e6d6b420ecea 100644 --- a/drivers/net/wireless/ath/ath10k/wmi.c +++ b/drivers/net/wireless/ath/ath10k/wmi.c @@ -3789,7 +3789,7 @@ static int ath10k_wmi_alloc_host_mem(struct ath10k *ar, u32 req_id, ar->wmi.mem_chunks[idx].vaddr = dma_alloc_coherent(ar->dev, pool_size, &paddr, - GFP_ATOMIC); + GFP_KERNEL); if (!ar->wmi.mem_chunks[idx].vaddr) { ath10k_warn(ar, "failed to allocate memory chunk\n"); return -ENOMEM; @@ -3878,12 +3878,19 @@ ath10k_wmi_10x_op_pull_svc_rdy_ev(struct ath10k *ar, struct sk_buff *skb, return 0; } -void ath10k_wmi_event_service_ready(struct ath10k *ar, struct sk_buff *skb) +static void ath10k_wmi_event_service_ready_work(struct work_struct *work) { + struct ath10k *ar = container_of(work, struct ath10k, svc_rdy_work); + struct sk_buff *skb = ar->svc_rdy_skb; struct wmi_svc_rdy_ev_arg arg = {}; u32 num_units, req_id, unit_size, num_mem_reqs, num_unit_info, i; int ret; + if (!skb) { + ath10k_warn(ar, "invalid service ready event skb\n"); + return; + } + ret = ath10k_wmi_pull_svc_rdy(ar, skb, &arg); if (ret) { ath10k_warn(ar, "failed to parse service ready: %d\n", ret); @@ -4003,9 +4010,17 @@ void ath10k_wmi_event_service_ready(struct ath10k *ar, struct sk_buff *skb) __le32_to_cpu(arg.eeprom_rd), __le32_to_cpu(arg.num_mem_reqs)); + dev_kfree_skb(skb); + ar->svc_rdy_skb = NULL; complete(&ar->wmi.service_ready); } +void ath10k_wmi_event_service_ready(struct ath10k *ar, struct sk_buff *skb) +{ + ar->svc_rdy_skb = skb; + queue_work(ar->workqueue_aux, &ar->svc_rdy_work); +} + static int ath10k_wmi_op_pull_rdy_ev(struct ath10k *ar, struct sk_buff *skb, struct wmi_rdy_ev_arg *arg) { @@ -4177,7 +4192,7 @@ static void ath10k_wmi_op_rx(struct ath10k *ar, struct sk_buff *skb) break; case WMI_SERVICE_READY_EVENTID: ath10k_wmi_event_service_ready(ar, skb); - break; + return; case WMI_READY_EVENTID: ath10k_wmi_event_ready(ar, skb); break; @@ -4298,7 +4313,7 @@ static void ath10k_wmi_10_1_op_rx(struct ath10k *ar, struct sk_buff *skb) break; case WMI_10X_SERVICE_READY_EVENTID: ath10k_wmi_event_service_ready(ar, skb); - break; + return; case WMI_10X_READY_EVENTID: ath10k_wmi_event_ready(ar, skb); break; @@ -4409,7 +4424,7 @@ static void ath10k_wmi_10_2_op_rx(struct ath10k *ar, struct sk_buff *skb) break; case WMI_10_2_SERVICE_READY_EVENTID: ath10k_wmi_event_service_ready(ar, skb); - break; + return; case WMI_10_2_READY_EVENTID: ath10k_wmi_event_ready(ar, skb); break; @@ -4461,7 +4476,7 @@ static void ath10k_wmi_10_4_op_rx(struct ath10k *ar, struct sk_buff *skb) break; case WMI_10_4_SERVICE_READY_EVENTID: ath10k_wmi_event_service_ready(ar, skb); - break; + return; case WMI_10_4_SCAN_EVENTID: ath10k_wmi_event_scan(ar, skb); break; @@ -6512,6 +6527,8 @@ int ath10k_wmi_attach(struct ath10k *ar) init_completion(&ar->wmi.service_ready); init_completion(&ar->wmi.unified_ready); + INIT_WORK(&ar->svc_rdy_work, ath10k_wmi_event_service_ready_work); + return 0; } @@ -6519,6 +6536,11 @@ void ath10k_wmi_detach(struct ath10k *ar) { int i; + cancel_work_sync(&ar->svc_rdy_work); + + if (ar->svc_rdy_skb) + dev_kfree_skb(ar->svc_rdy_skb); + /* free the host memory chunks requested by firmware */ for (i = 0; i < ar->wmi.num_mem_chunks; i++) { dma_free_coherent(ar->dev,