netdev - RE: [PATCH 0/4] rtw88: Four fixes found while working on SDIO support

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Date:   Thu, 29 Dec 2022 09:26:49 +0000
From:   Ping-Ke Shih <pkshih@...ltek.com>
To:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>
CC:     "tony0620emma@...il.com" <tony0620emma@...il.com>,
        "kvalo@...nel.org" <kvalo@...nel.org>,
        "tehuang@...ltek.com" <tehuang@...ltek.com>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 0/4] rtw88: Four fixes found while working on SDIO support



> -----Original Message-----
> From: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
> Sent: Wednesday, December 28, 2022 9:36 PM
> To: linux-wireless@...r.kernel.org
> Cc: tony0620emma@...il.com; kvalo@...nel.org; Ping-Ke Shih <pkshih@...ltek.com>; tehuang@...ltek.com;
> s.hauer@...gutronix.de; netdev@...r.kernel.org; linux-kernel@...r.kernel.org; Martin Blumenstingl
> <martin.blumenstingl@...glemail.com>
> Subject: [PATCH 0/4] rtw88: Four fixes found while working on SDIO support
> 
> This series consists of three patches which are fixing existing
> behavior (meaning: it either affects PCIe or USB or both) in the rtw88
> driver.
> 
> The first change adds the packed attribute to the eFuse structs. This
> was spotted by Ping-Ke while reviewing the SDIO support patches from
> [0].
> 
> The remaining three changes relate to locking (barrier hold) problems.
> We previously had discussed patches for this for SDIO support, but the
> problem never ocurred while testing USB cards. It turns out that these
> are still needed and I think that they also fix the same problems for
> USB users (it's not clear how often it happens there though).
> 
> The issue fixed by the second and third patches have been spotted by a
> user who tested rtw88 SDIO support. Everything is working fine for him
> but there are warnings [1] and [2] in the kernel log stating "Voluntary
> context switch within RCU read-side critical section!".
> 
> The solution in the third and fourth patch was actually suggested by
> Ping-Ke in [3]. Thanks again!
> 
> 
> [0] https://lore.kernel.org/linux-wireless/695c976e02ed44a2b2345a3ceb226fc4@realtek.com/
> [1] https://github.com/LibreELEC/LibreELEC.tv/pull/7301#issuecomment-1366421445
> [2] https://github.com/LibreELEC/LibreELEC.tv/pull/7301#issuecomment-1366610249
> [3] https://lore.kernel.org/lkml/e0aa1ba4336ab130712e1fcb425e6fd0adca4145.camel@realtek.com/
> 
> 
> Martin Blumenstingl (4):
>   rtw88: Add packed attribute to the eFuse structs

I think this patch depends on another patchset or oppositely.
Please point that out for reviewers.

>   rtw88: Configure the registers from rtw_bf_assoc() outside the RCU
>     lock
>   rtw88: Use rtw_iterate_vifs() for rtw_vif_watch_dog_iter()
>   rtw88: Use non-atomic rtw_iterate_stas() in rtw_ra_mask_info_update()
> 
>  drivers/net/wireless/realtek/rtw88/bf.c       | 13 ++++++------
>  drivers/net/wireless/realtek/rtw88/mac80211.c |  4 +++-
>  drivers/net/wireless/realtek/rtw88/main.c     |  6 ++++--
>  drivers/net/wireless/realtek/rtw88/main.h     |  6 +++---
>  drivers/net/wireless/realtek/rtw88/rtw8723d.h |  6 +++---
>  drivers/net/wireless/realtek/rtw88/rtw8821c.h | 20 +++++++++----------
>  drivers/net/wireless/realtek/rtw88/rtw8822b.h | 20 +++++++++----------
>  drivers/net/wireless/realtek/rtw88/rtw8822c.h | 20 +++++++++----------
>  8 files changed, 50 insertions(+), 45 deletions(-)
> 
> --
> 2.39.0