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Wed, 23 Sep 2020 00:23:42 -0700 (PDT) From: Chuanhong Guo To: linux-wireless@vger.kernel.org Subject: [PATCH] mt76: mt7615: retry if mt7615_mcu_init returns -EAGAIN Date: Wed, 23 Sep 2020 15:23:03 +0800 Message-Id: <20200923072330.1311907-1-gch981213@gmail.com> X-Mailer: git-send-email 2.26.2 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200923_032347_034590_95952E62 X-CRM114-Status: GOOD ( 14.33 ) X-Spam-Score: 2.6 (++) X-Spam-Report: SpamAssassin version 3.4.4 on merlin.infradead.org summary: Content analysis details: (2.6 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no trust [2607:f8b0:4864:20:0:0:0:442 listed in] [list.dnswl.org] 0.2 FREEMAIL_ENVFROM_END_DIGIT Envelope-from freemail username ends in digit [gch981213[at]gmail.com] 2.6 RCVD_IN_SBL RBL: Received via a relay in Spamhaus SBL [156.96.148.94 listed in zen.spamhaus.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider [gch981213[at]gmail.com] 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Ryder Lee , netdev@vger.kernel.org, Sean Wang , linux-kernel@vger.kernel.org, Matthias Brugger , linux-mediatek@lists.infradead.org, linux-arm-kernel@lists.infradead.org, Lorenzo Bianconi , Jakub Kicinski , Chuanhong Guo , "David S. Miller" , Kalle Valo , Felix Fietkau Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org mt7615_load_patch in mt7615/mcu.c sometimes fails with: mt7622-wmac 18000000.wmac: Failed to get patch semaphore and returns -EAGAIN. But this error is returned all the way up to mt7615_init_work with no actual retrial performed, leaving a broken wireless phy. Wait a bit and retry for up to 10 times before giving up. Signed-off-by: Chuanhong Guo --- On my mt7622 board mt7615_load_patch always fails the first time and it then succeeded on the first retry added by this patch. "10 times" is an arbitarily picked value and it'll still leave a broken phy behind if all 10 retries failed. I don't know if that's okay. Suggestions are welcome! drivers/net/wireless/mediatek/mt76/mt7615/pci_init.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/pci_init.c b/drivers/net/wireless/mediatek/mt76/mt7615/pci_init.c index 7224a00782115..2272f6bcaafe7 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7615/pci_init.c +++ b/drivers/net/wireless/mediatek/mt76/mt7615/pci_init.c @@ -16,8 +16,15 @@ static void mt7615_init_work(struct work_struct *work) { struct mt7615_dev *dev = container_of(work, struct mt7615_dev, mcu_work); + int i, ret; - if (mt7615_mcu_init(dev)) + ret = mt7615_mcu_init(dev); + for (i = 0; (ret == -EAGAIN) && (i < 10); i++) { + msleep(200); + ret = mt7615_mcu_init(dev); + } + + if (ret) return; mt7615_mcu_set_eeprom(dev);