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From: Madhavan Srinivasan <maddy@linux.ibm.com>
To: mpe@ellerman.id.au, npiggin@gmail.com,
	christophe.leroy@csgroup.eu, naveen@kernel.org,
	Gautam Menghani <gautam@linux.ibm.com>
Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,
	vaibhav@linux.ibm.com
Subject: Re: [PATCH] powerpc/pseries/msi: Avoid reading PCI device registers in reduced power states
Date: Sun,  4 May 2025 08:51:15 +0530	[thread overview]
Message-ID: <174632869188.233894.4873397095169337027.b4-ty@linux.ibm.com> (raw)
In-Reply-To: <20250305090237.294633-1-gautam@linux.ibm.com>

On Wed, 05 Mar 2025 14:32:36 +0530, Gautam Menghani wrote:
> When a system is being suspended to RAM, the PCI devices are also
> suspended and the PPC code ends up calling pseries_msi_compose_msg() and
> this triggers the BUG_ON() in __pci_read_msi_msg() because the device at
> this point is in reduced power state. In reduced power state, the memory
> mapped registers of the PCI device are not accessible.
> 
> To replicate the bug:
> 1. Make sure deep sleep is selected
> 	# cat /sys/power/mem_sleep
> 	s2idle [deep]
> 
> [...]

Applied to powerpc/next.

[1/1] powerpc/pseries/msi: Avoid reading PCI device registers in reduced power states
      https://git.kernel.org/powerpc/c/9cc0eafd28c7faef300822992bb08d79cab2a36c

Thanks

  parent reply	other threads:[~2025-05-04  3:21 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-03-05  9:02 Gautam Menghani
2025-03-10  5:00 ` Vaibhav Jain
2025-03-26 17:32   ` Venkat Rao Bagalkote
2025-04-21 11:50     ` Gautam Menghani
2025-05-04  3:21 ` Madhavan Srinivasan [this message]
2025-04-22  4:50 Venkat

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