From: Jeff Johnson <quic_jjohnson@quicinc.com>
To: Kalle Valo <kvalo@kernel.org>, <ath11k@lists.infradead.org>
Cc: <linux-wireless@vger.kernel.org>
Subject: Re: [PATCH 1/2] wifi: ath11k: use RCU when accessing struct inet6_dev::ac_list
Date: Thu, 11 Apr 2024 11:06:24 -0700 [thread overview]
Message-ID: <21398952-062e-44f4-85e2-c3d13ec46c44@quicinc.com> (raw)
In-Reply-To: <20240411165516.4070649-2-kvalo@kernel.org>
On 4/11/2024 9:55 AM, Kalle Valo wrote:
> From: Kalle Valo <quic_kvalo@quicinc.com>
>
> Commit c3718936ec47 ("ipv6: anycast: complete RCU handling of struct
> ifacaddr6") converted struct inet6_dev::ac_list to use RCU but missed that
> ath11k also accesses this list. Now sparse warns:
>
> drivers/net/wireless/ath/ath11k/mac.c:9145:21: warning: incorrect type in assignment (different address spaces)
> drivers/net/wireless/ath/ath11k/mac.c:9145:21: expected struct ifacaddr6 *ifaca6
> drivers/net/wireless/ath/ath11k/mac.c:9145:21: got struct ifacaddr6 [noderef] __rcu *ac_list
> drivers/net/wireless/ath/ath11k/mac.c:9145:53: warning: incorrect type in assignment (different address spaces)
> drivers/net/wireless/ath/ath11k/mac.c:9145:53: expected struct ifacaddr6 *ifaca6
> drivers/net/wireless/ath/ath11k/mac.c:9145:53: got struct ifacaddr6 [noderef] __rcu *aca_next
>
> Fix it by using rtnl_dereference(). Also add a note that read_lock_bh() calls
> rcu_read_lock() which I was not aware of.
>
> Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3.6510.37
>
> Fixes: c3718936ec47 ("ipv6: anycast: complete RCU handling of struct ifacaddr6")
> Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Acked-by: Jeff Johnson <quic_jjohnson@quicinc.com>
next prev parent reply other threads:[~2024-04-11 18:06 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-11 16:55 [PATCH 0/2] wifi: ath11k: use RCU when accessing struct inet6_dev::ac_list Kalle Valo
2024-04-11 16:55 ` [PATCH 1/2] " Kalle Valo
2024-04-11 18:06 ` Jeff Johnson [this message]
2024-04-16 15:25 ` Kalle Valo
2024-04-11 16:55 ` [PATCH 2/2] wifi: ath11k: ath11k_mac_op_ipv6_changed(): use list_for_each_entry() Kalle Valo
2024-04-11 18:06 ` Jeff Johnson
2024-05-03 13:06 ` Kalle Valo
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