2020-09-03 19:53:46

by Ben Greear

Subject: [PATCH] ath11k: Fix napi related hang

From: Ben Greear <[email protected]>

Similar to the same bug in ath10k, a napi disable w/out it being enabled
will hang forever. I believe I saw this while trying rmmod after driver
had some failure on startup. Fix it by keeping state on whether napi is
enabled or not.

And, remove un-used napi pointer in ath10k driver base struct.

Signed-off-by: Ben Greear <[email protected]>
---
drivers/net/wireless/ath/ath11k/ahb.c | 12 +++++++++---
drivers/net/wireless/ath/ath11k/core.h | 2 +-
drivers/net/wireless/ath/ath11k/pci.c | 12 +++++++++---
3 files changed, 19 insertions(+), 7 deletions(-)

diff --git a/drivers/net/wireless/ath/ath11k/ahb.c b/drivers/net/wireless/ath/ath11k/ahb.c
index 6380d48e013d7..e667f5f0a0686 100644
--- a/drivers/net/wireless/ath/ath11k/ahb.c
+++ b/drivers/net/wireless/ath/ath11k/ahb.c
@@ -411,8 +411,11 @@ static void __ath11k_ahb_ext_irq_disable(struct ath11k_base *ab)

ath11k_ahb_ext_grp_disable(irq_grp);

- napi_synchronize(&irq_grp->napi);
- napi_disable(&irq_grp->napi);
+ if (irq_grp->napi_enabled) {
+ napi_synchronize(&irq_grp->napi);
+ napi_disable(&irq_grp->napi);
+ irq_grp->napi_enabled = false;
+ }
}
}

@@ -536,7 +539,10 @@ static void ath11k_ahb_ext_irq_enable(struct ath11k_base *ab)
for (i = 0; i < ATH11K_EXT_IRQ_GRP_NUM_MAX; i++) {
struct ath11k_ext_irq_grp *irq_grp = &ab->ext_irq_grp[i];

- napi_enable(&irq_grp->napi);
+ if (!irq_grp->napi_enabled) {
+ napi_enable(&irq_grp->napi);
+ irq_grp->napi_enabled = true;
+ }
ath11k_ahb_ext_grp_enable(irq_grp);
}
}
diff --git a/drivers/net/wireless/ath/ath11k/core.h b/drivers/net/wireless/ath/ath11k/core.h
index 858dfc700d54c..ac03c9c0f07ef 100644
--- a/drivers/net/wireless/ath/ath11k/core.h
+++ b/drivers/net/wireless/ath/ath11k/core.h
@@ -111,6 +111,7 @@ struct ath11k_ext_irq_grp {
u32 num_irq;
u32 grp_id;
u64 timestamp;
+ bool napi_enabled;
struct napi_struct napi;
struct net_device napi_ndev;
};
@@ -674,7 +675,6 @@ struct ath11k_base {
u32 wlan_init_status;
int irq_num[ATH11K_IRQ_NUM_MAX];
struct ath11k_ext_irq_grp ext_irq_grp[ATH11K_EXT_IRQ_GRP_NUM_MAX];
- struct napi_struct *napi;
struct ath11k_targ_cap target_caps;
u32 ext_service_bitmap[WMI_SERVICE_EXT_BM_SIZE];
bool pdevs_macaddr_valid;
diff --git a/drivers/net/wireless/ath/ath11k/pci.c b/drivers/net/wireless/ath/ath11k/pci.c
index b3f1c6659f419..1e2fc8932a66e 100644
--- a/drivers/net/wireless/ath/ath11k/pci.c
+++ b/drivers/net/wireless/ath/ath11k/pci.c
@@ -569,8 +569,11 @@ static void __ath11k_pci_ext_irq_disable(struct ath11k_base *sc)

ath11k_pci_ext_grp_disable(irq_grp);

- napi_synchronize(&irq_grp->napi);
- napi_disable(&irq_grp->napi);
+ if (irq_grp->napi_enabled) {
+ napi_synchronize(&irq_grp->napi);
+ napi_disable(&irq_grp->napi);
+ irq_grp->napi_enabled = false;
+ }
}
}

@@ -589,7 +592,10 @@ static void ath11k_pci_ext_irq_enable(struct ath11k_base *ab)
for (i = 0; i < ATH11K_EXT_IRQ_GRP_NUM_MAX; i++) {
struct ath11k_ext_irq_grp *irq_grp = &ab->ext_irq_grp[i];

- napi_enable(&irq_grp->napi);
+ if (!irq_grp->napi_enabled) {
+ napi_enable(&irq_grp->napi);
+ irq_grp->napi_enabled = true;
+ }
ath11k_pci_ext_grp_enable(irq_grp);
}
}
--
2.26.2

2021-12-22 06:02:47

by Kalle Valo

Subject: Re: [PATCH] ath11k: Fix napi related hang

[email protected] wrote:

> Similar to the same bug in ath10k, a napi disable w/out it being enabled
> will hang forever. I believe I saw this while trying rmmod after driver
> had some failure on startup. Fix it by keeping state on whether napi is
> enabled or not.
>
> And, remove un-used napi pointer in ath11k driver base struct.
>
> Signed-off-by: Ben Greear <[email protected]>
> Signed-off-by: Kalle Valo <[email protected]>

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

d943fdad7589 ath11k: Fix napi related hang

--
https://patchwork.kernel.org/project/linux-wireless/patch/[email protected]/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches