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From: Matan Azrad <matan@mellanox.com>
To: Jeff Guo <jia.guo@intel.com>,
	"konstantin.ananyev@intel.com" <konstantin.ananyev@intel.com>,
	"anatoly.burakov@intel.com" <anatoly.burakov@intel.com>,
	Thomas Monjalon <thomas@monjalon.net>,
	"bernard.iremonger@intel.com" <bernard.iremonger@intel.com>,
	"jingjing.wu@intel.com" <jingjing.wu@intel.com>,
	"wenzhuo.lu@intel.com" <wenzhuo.lu@intel.com>
Cc: "ferruh.yigit@intel.com" <ferruh.yigit@intel.com>,
	"dev@dpdk.org" <dev@dpdk.org>,
	"helin.zhang@intel.com" <helin.zhang@intel.com>,
	"shaopeng.he@intel.com" <shaopeng.he@intel.com>
Subject: Re: [dpdk-dev] [PATCH 1/3] eal: fix lock issue for hot-unplug
Date: Tue, 6 Nov 2018 06:22:44 +0000
Message-ID: <AM0PR0502MB401957A51BA517C038AC4D74D2CB0@AM0PR0502MB4019.eurprd05.prod.outlook.com> (raw)
In-Reply-To: <1541484436-91320-2-git-send-email-jia.guo@intel.com>

Hi Jeff

Can you detail more in the commit log that we can understand the deadlock scenario. And how does this commit fix it? 

> -----Original Message-----
> From: Jeff Guo <jia.guo@intel.com>
> Sent: Tuesday, November 6, 2018 8:07 AM
> To: konstantin.ananyev@intel.com; anatoly.burakov@intel.com; Thomas
> Monjalon <thomas@monjalon.net>; bernard.iremonger@intel.com;
> jingjing.wu@intel.com; wenzhuo.lu@intel.com
> Cc: ferruh.yigit@intel.com; dev@dpdk.org; jia.guo@intel.com;
> helin.zhang@intel.com; Matan Azrad <matan@mellanox.com>;
> shaopeng.he@intel.com
> Subject: [PATCH 1/3] eal: fix lock issue for hot-unplug
> 
> This patch will add missing unlock for hot-unplug handler, without this patch
> potential dead lock will occur when device be hotplug-in after device be hot-
> unplugged.
> 
> Fixes: 0fc54536b14a ("eal: add failure handling for hot-unplug")
> Signed-off-by: Jeff Guo <jia.guo@intel.com>
> ---
>  lib/librte_eal/linuxapp/eal/eal_dev.c | 12 ++++++++----
>  1 file changed, 8 insertions(+), 4 deletions(-)
> 
> diff --git a/lib/librte_eal/linuxapp/eal/eal_dev.c
> b/lib/librte_eal/linuxapp/eal/eal_dev.c
> index d589c69..2830c86 100644
> --- a/lib/librte_eal/linuxapp/eal/eal_dev.c
> +++ b/lib/librte_eal/linuxapp/eal/eal_dev.c
> @@ -258,7 +258,7 @@ dev_uev_handler(__rte_unused void *param)
>  			if (bus == NULL) {
>  				RTE_LOG(ERR, EAL, "Cannot find bus (%s)\n",
>  					busname);
> -				return;
> +				goto failure_handle_err;
>  			}
> 
>  			dev = bus->find_device(NULL, cmp_dev_name, @@
> -266,19 +266,23 @@ dev_uev_handler(__rte_unused void *param)
>  			if (dev == NULL) {
>  				RTE_LOG(ERR, EAL, "Cannot find device (%s)
> on "
>  					"bus (%s)\n", uevent.devname,
> busname);
> -				return;
> +				goto failure_handle_err;
>  			}
> 
>  			ret = bus->hot_unplug_handler(dev);
> -			rte_spinlock_unlock(&failure_handle_lock);
>  			if (ret) {
>  				RTE_LOG(ERR, EAL, "Can not handle hot-
> unplug "
>  					"for device (%s)\n", dev->name);
> -				return;
>  			}
> +			rte_spinlock_unlock(&failure_handle_lock);
>  		}
>  		rte_dev_event_callback_process(uevent.devname,
> uevent.type);
>  	}
> +
> +	return;
> +
> +failure_handle_err:
> +	rte_spinlock_unlock(&failure_handle_lock);
>  }
> 
>  int __rte_experimental
> --
> 2.7.4

  reply	other threads:[~2018-11-06  6:22 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-11-06  6:07 [dpdk-dev] [PATCH 0/3] fix vfio hot-unplug issue Jeff Guo
2018-11-06  6:07 ` [dpdk-dev] [PATCH 1/3] eal: fix lock issue for hot-unplug Jeff Guo
2018-11-06  6:22   ` Matan Azrad [this message]
2018-11-07  5:49     ` Jeff Guo
2018-11-08  7:08       ` Matan Azrad
2018-11-06  6:07 ` [dpdk-dev] [PATCH 2/3] vfio: fix to add handler lock " Jeff Guo
2018-11-06  6:23   ` Matan Azrad
2018-11-07  6:15     ` Jeff Guo
2018-11-08  7:20       ` Matan Azrad
2018-11-08  8:30         ` Jeff Guo
2018-11-06  6:07 ` [dpdk-dev] [PATCH 3/3] app/testpmd: fix callback issue " Jeff Guo
2018-11-06  6:36   ` Matan Azrad
2018-11-07  7:30     ` Jeff Guo
2018-11-07 11:05       ` Ananyev, Konstantin
2018-11-08  7:28         ` Matan Azrad
2018-11-08  8:49           ` Jeff Guo
2018-11-08  9:35             ` Matan Azrad
2018-11-09  3:55               ` Jeff Guo
2018-11-09  5:24                 ` Matan Azrad
2018-11-09  6:17                   ` Jeff Guo
     [not found]                     ` <AM0PR0502MB401938411A7E2BA9E76576A2D2C00@AM0PR0502MB4019.eurprd05.prod.outlook.com>
2018-11-12  1:35                       ` Thomas Monjalon
2018-11-14  9:32                         ` Jeff Guo
2018-11-15  9:18 ` [dpdk-dev] [PATCH V2 0/3] fix vfio hot-unplug issue Jeff Guo
2018-11-15  9:18   ` Jeff Guo
2018-11-18 16:19     ` Thomas Monjalon
2018-11-15  9:18   ` [dpdk-dev] [PATCH V2 1/3] eal: fix lock issue for hot-unplug Jeff Guo
2018-11-15  9:18   ` [dpdk-dev] [PATCH V2 2/3] vfio: fix to add handler lock " Jeff Guo
2018-11-15  9:18   ` [dpdk-dev] [PATCH V2 3/3] app/testpmd: fix callback issue " Jeff Guo

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