ACK/Cmnt: [SRU][Bionic/dell300x][PATCH 0/1] dell300x: rsi wifi and bluetooth crash after suspend and resume

Stefan Bader stefan.bader at
Thu Aug 19 06:26:21 UTC 2021

On 19.08.21 06:05, Hui Wang wrote:
> BugLink:
> I tested the upstream stable kernel 4.19.191, also could reproduce
> this issue, and reported this testing result to stable mail list.
> [Impact]
> On the Dell300x machine, after system suspend and resume, the wifi
> and bluetooth can't work anymore.
> [Fix]
> Revert a patch which was applied to bionic kernel from stable update.
> [Test]
> Booting up with the patched kernel, run $sudo rtcwake -m freeze -s 10,
> then check dmesg to make sure there is crashing log, and run 'nmcli d
> wifi' and 'bluetoothctl, power on, scan on', all worked well.
> [Where problems could occur]
> After applying this SRU, the rsi wifi and bluetooth could have come
> change, like wifi and bluetooth can't work well after resume, but this
> possibility is very low, I already run '$sudo rtcwake -m freeze -s 10'
> for 50 times, the wifi and bluetooth still worked well.
> Hui Wang (1):
>    Revert "rsi: Use resume_noirq for SDIO"
>   drivers/net/wireless/rsi/rsi_91x_sdio.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
To clarify this, I think this should be high priority for bionic:linux-dell300x 
as we still have a chance to get it included in the 2021.08.16 cycle and right 
now this is the only kernel we have positive confirmation to be affected.
However in the long run we should do the same revert in the primary kernel 
source while waiting for upstream decisions there. Since we delayed the respin 
of the primary kernel for fixes required to some security changes due to some 
other odd behavior seen in testing, we still might have a chance to do this in 
the primary kernel and then dell300x will get it on rebase.
I added both destinations to the bug report to leave us both possibilities.

Acked-by: Stefan Bader <stefan.bader at>

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