linux-kernel - Re: [PATCH 1/2] bus: mhi: host: pci_generic: Use pci_try_reset

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Message-ID: <Z7XiKBD63EE7ZzNr@hovoldconsulting.com>
Date: Wed, 19 Feb 2025 14:52:40 +0100
From: Johan Hovold <johan@...nel.org>
To: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc: mhi@...ts.linux.dev, Loic Poulain <loic.poulain@...aro.org>,
	linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Subject: Re: [PATCH 1/2] bus: mhi: host: pci_generic: Use
 pci_try_reset_function() to avoid deadlock

On Wed, Feb 19, 2025 at 06:43:24PM +0530, Manivannan Sadhasivam wrote:
> On Wed, Jan 22, 2025 at 04:11:41PM +0100, Johan Hovold wrote:

> > I can confirm that this patch (alone) fixes the deadlock on shutdown
> > and suspend as expected, but it does leave the system state that blocks
> > further suspend (this is with patches that tear down the PCI link).

> > > Cc: stable@...r.kernel.org # 5.12
> > > Reported-by: Johan Hovold <johan@...nel.org>
> > > Closes: https://lore.kernel.org/mhi/Z1me8iaK7cwgjL92@hovoldconsulting.com

> > > Fixes: 7389337f0a78 ("mhi: pci_generic: Add suspend/resume/recovery procedure")
> > > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>

> Makes sense. Added the errno to the log and applied to patch to mhi/next with
> your tags. Thanks a lot!

Since this fixes a severe issue that hangs the machine on suspend and
shutdown, please try to get this fixed already in 6.14-rc.

Johan