linux-kernel - RE: [PATCH net] ixgbe: fix unbalanced device enable/disable in suspend/resume

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Date:   Fri, 9 Apr 2021 19:56:03 +0000
From:   "Switzer, David" <david.switzer@...el.com>
To:     Yongxin Liu <yongxin.liu@...driver.com>,
        "vaibhavgupta40@...il.com" <vaibhavgupta40@...il.com>,
        "andrewx.bowers@...el.com" <andrewx.bowers@...el.com>,
        "Nguyen, Anthony L" <anthony.l.nguyen@...el.com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "Brandeburg, Jesse" <jesse.brandeburg@...el.com>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
        "kuba@...nel.org" <kuba@...nel.org>
Subject: RE: [PATCH net] ixgbe: fix unbalanced device enable/disable in
 suspend/resume


>-----Original Message-----
>From: Yongxin Liu <yongxin.liu@...driver.com>
>Sent: Monday, March 22, 2021 12:15 AM
>To: vaibhavgupta40@...il.com; andrewx.bowers@...el.com; Nguyen, Anthony
>L <anthony.l.nguyen@...el.com>
>Cc: netdev@...r.kernel.org; linux-kernel@...r.kernel.org;
>davem@...emloft.net; Brandeburg, Jesse <jesse.brandeburg@...el.com>; intel-
>wired-lan@...ts.osuosl.org; kuba@...nel.org
>Subject: [PATCH net] ixgbe: fix unbalanced device enable/disable in
>suspend/resume
>
>pci_disable_device() called in __ixgbe_shutdown() decreases
>dev->enable_cnt by 1. pci_enable_device_mem() which increases enable_cnt
>dev->by 1, was removed from ixgbe_resume() in commit
>6f82b2558735 ("ixgbe: use generic power management"). This caused
>unbalanced increase/decrease. So add pci_enable_device_mem() back.
>
>Fix the following call trace.
>
>  ixgbe 0000:17:00.1: disabling already-disabled device
>  Call Trace:
>   __ixgbe_shutdown+0x10a/0x1e0 [ixgbe]
>   ixgbe_suspend+0x32/0x70 [ixgbe]
>   pci_pm_suspend+0x87/0x160
>   ? pci_pm_freeze+0xd0/0xd0
>   dpm_run_callback+0x42/0x170
>   __device_suspend+0x114/0x460
>   async_suspend+0x1f/0xa0
>   async_run_entry_fn+0x3c/0xf0
>   process_one_work+0x1dd/0x410
>   worker_thread+0x34/0x3f0
>   ? cancel_delayed_work+0x90/0x90
>   kthread+0x14c/0x170
>   ? kthread_park+0x90/0x90
>   ret_from_fork+0x1f/0x30
>
>Fixes: 6f82b2558735 ("ixgbe: use generic power management")
>Signed-off-by: Yongxin Liu <yongxin.liu@...driver.com>
>---
> drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
Tested-by: Dave Switzer <david.switzer@...el.com>