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Date: Mon, 17 Feb 2020 14:06:50 -0800 (PST) From: David Miller <davem@...emloft.net> To: horatiu.vultur@...rochip.com Cc: alexandre.belloni@...tlin.com, UNGLinuxDriver@...rochip.com, netdev@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH] net: mscc: fix in frame extraction From: Horatiu Vultur <horatiu.vultur@...rochip.com> Date: Mon, 17 Feb 2020 09:31:33 +0100 > Each extracted frame on Ocelot has an IFH. The frame and IFH are extracted > by reading chuncks of 4 bytes from a register. > > In case the IFH and frames were read corretly it would try to read the next > frame. In case there are no more frames in the queue, it checks if there > were any previous errors and in that case clear the queue. But this check > will always succeed also when there are no errors. Because when extracting > the IFH the error is checked against 4(number of bytes read) and then the > error is set only if the extraction of the frame failed. So in a happy case > where there are no errors the err variable is still 4. So it could be > a case where after the check that there are no more frames in the queue, a > frame will arrive in the queue but because the error is not reseted, it > would try to flush the queue. So the frame will be lost. > > The fix consist in resetting the error after reading the IFH. > > Signed-off-by: Horatiu Vultur <horatiu.vultur@...rochip.com> Applied and queued up for -stable.
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