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Message-Id: <20151101.120404.1795383010650058295.davem@davemloft.net> Date: Sun, 01 Nov 2015 12:04:04 -0500 (EST) From: David Miller <davem@...emloft.net> To: thomas.lendacky@....com Cc: netdev@...r.kernel.org, alexander.duyck@...il.com Subject: Re: [PATCH net] amd-xgbe: Fix race between access of desc and desc index From: Tom Lendacky <thomas.lendacky@....com> Date: Wed, 28 Oct 2015 08:48:36 -0500 > On 10/27/2015 09:50 PM, David Miller wrote: >> From: Tom Lendacky <thomas.lendacky@....com> >> Date: Mon, 26 Oct 2015 17:13:54 -0500 >> >>> During Tx cleanup it's still possible for the descriptor data to be >>> read ahead of the descriptor index. A memory barrier is required >>> between >>> the read of the descriptor index and the start of the Tx cleanup loop. >>> This allows a change to a lighter-weight barrier in the Tx transmit >>> routine just before updating the current descriptor index. >>> >>> Since the memory barrier does result in extra overhead on arm64, keep >>> the previous change to not chase the current descriptor value. This >>> prevents the execution of the barrier for each loop performed. >>> >>> Suggested-by: Alexander Duyck <alexander.duyck@...il.com> >>> Signed-off-by: Tom Lendacky <thomas.lendacky@....com> >> >> Applied, thanks. >> > > Thanks David. Could you queue this up for the 4.1 and 4.2 stable > trees? Ok, done. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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