linux-kernel - Re: [PATCH] net: macb: Fix race condition in driver when Rx frame is dropped

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Message-Id: <20150429.152502.1871572837950161327.davem@davemloft.net>
Date:	Wed, 29 Apr 2015 15:25:02 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	punnaiah.choudary.kalluri@...inx.com
Cc:	nicolas.ferre@...el.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, michals@...inx.com,
	harinik@...inx.com, kpc528@...il.com,
	kalluripunnaiahchoudary@...il.com, punnaia@...inx.com
Subject: Re: [PATCH] net: macb: Fix race condition in driver when Rx frame
 is dropped

From: Punnaiah Choudary Kalluri <punnaiah.choudary.kalluri@...inx.com>
Date: Wed, 29 Apr 2015 08:34:46 +0530

> From: Punnaiah Choudary Kalluri <punnaiah.choudary.kalluri@...inx.com>
> 
> Under heavy Rx load, observed that the Hw is updating the USED bit
> and it is not updating the received frame status to the BD control
> field. This could be lack of resources for processing the BDs at high
> data rates. Driver drops the frame associated with this BD but not
> clearing the USED bit. So, this is causing hang condition as Hw
> expects USED bit to be cleared for this BD.
> 
> Signed-off-by: Punnaiah Choudary Kalluri <punnaia@...inx.com>

Applied, thanks.
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