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[199.116.72.162]) by smtp.gmail.com with ESMTPSA id u3sm18761515pfn.134.2019.10.22.10.16.57 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 22 Oct 2019 10:16:57 -0700 (PDT) Subject: Re: [PATCH RFC] Revert "ath10k: fix DMA related firmware crashes on multiple devices" To: Zhi Chen , ath10k@lists.infradead.org Cc: linux-wireless@vger.kernel.org References: <1571734629-18028-1-git-send-email-zhichen@codeaurora.org> From: Peter Oh Message-ID: Date: Tue, 22 Oct 2019 10:16:53 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <1571734629-18028-1-git-send-email-zhichen@codeaurora.org> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US Sender: linux-wireless-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org On 10/22/19 1:57 AM, Zhi Chen wrote: > This reverts commit 76d164f582150fd0259ec0fcbc485470bcd8033e. > PCIe hung issue was observed on multiple platforms. The issue was reproduced > when DUT was configured as AP and associated with 50+ STAs. > > With PCIe protocol analyzer, we can see DMA Read crossing 4KB boundary when > issue happened. It broke PCIe spec and caused PCIe stuck. How can you say value 0 (I believe it's 64 bytes) DMA burst size causes the symptom and 1 fixes it? Peter