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Miller" , "Eric Dumazet" , "Jakub Kicinski" , "Paolo Abeni" , "Yixun Lan" , "Vivian Wang" , "Chukun Pan" , "Siddharth Vadapalli" , "Tomas Hlavacek" , "Muhammad Bilal" , "Maxime Chevallier" , , , X-Mailer: aerc 0.21.0-reader-ipc4 References: <20261105123441.2524171-1-alitariq45892@gmail.com> <12a95b3a-9c8b-4a2d-9b81-12b3839e64a9@lunn.ch> In-Reply-To: <12a95b3a-9c8b-4a2d-9b81-12b3839e64a9@lunn.ch> X-QQ-SENDSIZE: 520 Feedback-ID: esmtpgz:linux.spacemit.com:qybglogicsvrgz:qybglogicsvrgz3a-0 X-QQ-XMAILINFO: MME7GB1W8aIneB/PcnuM8U0HR8lqg7GEcSYyh9QnR9iBnl8iEvUaLDs4 6y0C5UuGxSfDnqzxzpUILr176+VdxBTwR1CSnzMDOC+Qh64bELgxp/Hkyp8noy9Of25x46I /FnKlE/K/Rv97xcdgLt8WOdpfz7R+SNdoWYkSobFnDgYXdBpBp9BuSteBFDD84LanRBk5yh Ci7jACHXSjtxnv/aS2WA8zuGNRSseo75nNLqeuTuZmg5qBuFSR/Dx9aJrngEuMf8thqPwXc EgbGXUUQ4uvkfglsErxUet2fT06GQMb0gkzzQLJWyYxuXZwMQy9Ikms3sCuoeOkhyvd5LJ3 vJrmCD7t6MTpycaEGJDh7ENFsLoa8SLK/+P2VbNLLLzGqOLsiUnfnExMVuJ0XQHBACXY0DO r09q5vimGa+iWbPEWeS5/IFEkzkYJl6ZnFHo0VP32ZXEuQJaiksiu1ZpaZwOuk/lDQfmGBj tMdKZMa9oASYqrd9h3QEe64zXx1qJndo9TQlD571lEdVKeEzFjKvoXbOaWf32t+FFVy1SBJ 6jvmOJQjuiFj1UvEZZXvIROxmSK1LikxQNMXJYE3lpnuEMAU5WlRAB3dWS5VvHgXU1P5D9a nNmC/JfvFz+lEVgcCtZLOJvwyAgudId9Gkr4W1W/HfwHtVxPQhk4zOsI6AJZcz5TMleTwTn i/X4E+fdA0J9T6YDttqRhOgcTHZJk9MTBR7+dAwegXF/fV1t12vT0XNYbnLNuMYGkvxawVO 4+GY4W2pdZ3X+fcMLzZ4C/W/ls/OqICi4t3fMBjSrbxgqeYBxrKusKgaPqwPO8odPZvsdiz NdS02qsMFbCHKtfvsGXdMV/QuOYtbfn8iCJ5xx6eaIR9Jzd4xGm7iFSZQBtubStlAmRiyC7 3jEF4G6meoq1M9Y4lsS1FQKT2dBOG9SdMUgWxkLLVesRTELpbHSb9Mrj3o3MZOW1+ybznnj d0HpuSi8tJRU/67lqDuHmXQ345vrxITw/t40GAc3+NEYV7j2WO7TqZUOr1wZ4KRYsKXoijm pr0ietjlLZP164/EV3cCLyj/S3IGn8RRTqcvHSb+rR8LNhkvQ5n79PzcuxYL6i/kZeisyKb uG6rS3XrpBy+4PN+1E6IfDjNXH2tz3XnTyxTTTfRjHu X-QQ-XMRINFO: M/715EihBoGS47X28/vv4NpnfpeBLnr4Qg== X-QQ-RECHKSPAM: 0 --a02f21ac2a7151b86497f96503bce060f3b96109e2e2f1aeb6516b655868 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 On Sat Nov 7, 2026 at 5:32 PM GMT, Andrew Lunn wrote: > On Fri, Nov 06, 2026 at 03:44:50PM +0500, Ali Tariq wrote: >>=20 >>=20 >> On 11/6/26 2:43 PM, Troy Mitchell wrote: >> > On Thu, 5 Nov 2026 17:34:37 +0500, Ali Tariq wrote: >> > > @@ -2056,7 +2059,9 @@ static int emac_suspend(struct device *dev) >> > > return 0; >> > > } >> > > + rtnl_lock(); >> > > emac_stop(ndev); >> > > + rtnl_unlock(); >> > > clk_disable_unprepare(priv->bus_clk); >> > > netif_device_detach(ndev); >> > This can deadlock. emac_stop() -> emac_down() calls >> > cancel_work_sync(&priv->tx_timeout_task) with RTNL now held, while >> > emac_tx_timeout_task() starts with rtnl_lock(). >> >=20 >>=20 >> Thanks Troy, that makes sense. >>=20 >> For the deadlock, I think the correct function to call is rtnl_trylock() >> inside the emac_tx_timeout_task(), which would return if the lock is alr= eady >> held and will hold the lock if it is not. > > rtnl_trylock() is generally a workaround needed for badly written > code. Please try to avoid it. Agreed. If the reset is done in place, the work does not need RTNL at all, so .ndo_stop can keep cancel_work_sync() as is. --=20 Troy Mitchell --a02f21ac2a7151b86497f96503bce060f3b96109e2e2f1aeb6516b655868 Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iJcEABYKAD8WIQSL4Ay2cExaPXAQcU2YCe+A+TM0LwUCavAidyEcdHJveS5taXRj aGVsbEBsaW51eC5zcGFjZW1pdC5jb20ACgkQmAnvgPkzNC9B0gEA1znr4tPpsYVC nAv98ga0dRZipfyxeRX03GPDfyO2H9kA/0MZoMdmj9AE80+OsoJRT6mWefpeM6Si aoXyFnKOqZsD =cK0u -----END PGP SIGNATURE----- --a02f21ac2a7151b86497f96503bce060f3b96109e2e2f1aeb6516b655868-- From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 73C3B606A31C for ; Sun, 8 Nov 2026 07:20:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.a=rsa-sha256 header.s=bombadil.20210309 header.b=SVqOovZa; dkim=fail reason="signature verification failed" (1024-bit key) header.d=linux.spacemit.com header.i=@linux.spacemit.com header.a=rsa-sha256 header.s=mxsw2412 header.b=l0ptajlX DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:Content-Type: List-Subscribe:List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id: In-Reply-To:References:Cc:To:From:Subject:Message-Id:Date:Mime-Version: Reply-To:Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date :Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Unsubscribe-Post:List-Owner; bh=Y8hNpZVeCyVxFw2j9HP+uAiwl4eSwXXFk3R4F1vwGgg=; b=SVqOovZa9nCRTgHqRUBeBqC8ua zFAQ7u4YxEwTNT6RaFjX5AjUEmUvHqj24QWti08SBgrgzqMrhVtWQ9PjhFiwJxdcrfQgAPBGtjmhF FFt5rzakEri/pTWr0D8QJkcZoKXSZ67OTN+3SfVJv/fFDi9IMPhhn0/36tzEmeG2Id2jT6wQohCWO vu5Gi0zDrcrzR0OOVI1RDieSnoWt1Je6yyfrkXpodxHXRm8wWLBrm92d5tRLqs8dUCpLv5Wvng08t faPu7rov3jZidLlJsxx/T2OFfG1+9O15J7FowzREUuSv/GVmm+Bp+qiatlA+c98E3t9wYVM3npUBe gfVNlA6w==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.100.1 #2 (Red Hat Linux)) id 1xPxCZ-0000000FmXd-3xHg; Sun, 08 Nov 2026 07:20:31 +0000 Received: from smtpbguseast1.qq.com ([54.204.34.129]) by bombadil.infradead.org with esmtps (Exim 4.100.1 #2 (Red Hat Linux)) id 1xPxCW-0000000FmX2-17xA for linux-riscv@lists.infradead.org; Sun, 08 Nov 2026 07:20:30 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.spacemit.com; s=mxsw2412; t=1794122370; bh=oK11WFoEYcxKkv5gOP1n+/n0b5JmGN4huhLMKQpylEw=; h=Mime-Version:Date:Message-Id:Subject:From:To; b=l0ptajlXbZ1z/LmNL+8Zy2JXI2/679E0JwjjM/4chZYVXNgjlN3weW/PUCagY0KiJ Mh7aOIkwibLfLDTV/IQF1kv8+xdRDpNacN1Z7uYTkeO+/5lA45ub3opd/i7CsS+pqX U9VDqubZ3YNltyHuVYmoikqJtQKOaB0WUZg0iiVU= X-QQ-mid: esmtpgz15t1794122363t4cfaa196 X-QQ-Originating-IP: 70UR/8/Qz3+J8nvl4pXEMghTUj9NoHrmNfQe2/YfDAM= Received: from = ( [120.237.158.181]) by bizesmtp.qq.com (ESMTP) with id ; Sun, 08 Nov 2026 15:19:20 +0800 (CST) X-QQ-SSF: 0000000000000000000000000000000 X-QQ-GoodBg: 0 X-BIZMAIL-ID: 17965104858753304052 EX-QQ-RecipientCnt: 20 X-Archived-By: Mime-Version: 1.0 Date: Sun, 08 Nov 2026 07:19:19 +0000 Message-Id: Subject: Re: [PATCH net] net: spacemit: Hold RTNL lock in emac_resume() and emac_suspend() From: "Troy Mitchell" To: "Andrew Lunn" , "Ali Tariq" Cc: "Troy Mitchell" , "Vadim Fedorenko" , , "Andrew Lunn" , "David S. Miller" , "Eric Dumazet" , "Jakub Kicinski" , "Paolo Abeni" , "Yixun Lan" , "Vivian Wang" , "Chukun Pan" , "Siddharth Vadapalli" , "Tomas Hlavacek" , "Muhammad Bilal" , "Maxime Chevallier" , , , X-Mailer: aerc 0.21.0-reader-ipc4 References: <20261105123441.2524171-1-alitariq45892@gmail.com> <12a95b3a-9c8b-4a2d-9b81-12b3839e64a9@lunn.ch> In-Reply-To: <12a95b3a-9c8b-4a2d-9b81-12b3839e64a9@lunn.ch> X-QQ-SENDSIZE: 520 Feedback-ID: esmtpgz:linux.spacemit.com:qybglogicsvrgz:qybglogicsvrgz3a-0 X-QQ-XMAILINFO: OLw9GlLWtKW/J1wI9COrZ8m4Rvm7AcJvYQWonqDnZ/Qn1ieXLi3y076u 5rQiQTfLHhwVyrOBEoAgOkEZlqsqrJ37EyJrVN044chFlmDZ+vC/4zNyYRfELqx3GnAs2Kb tIKSSrI+LD2825rxl9hFFY6k5PJlH451RDTdLG4K47/4qfynPzK/wbjqJwnjTKL8a6x09FS hAx0VRwjYPf+s0f9+D2jYnwDvY30ukSDVTnRk01uCmyfkyFttDwOHaQRoCEK9T1atvca5jL uBbo9RvQp3lSiYSegmHNpAr75ObY2ihEjIPf8LiaRFEAMRZWm55/DGgSIp6sS9HaAy7Y4iD 8gt9EoSSo/1ZCBHqCu9KD6r9bVuntMzMClYCyD2KxGERjIQuQToarvSUZI669ulCq5bz+qE b6QhzLR8vZav7PJQu4W9kCzBpdRq3dwlCAm3S0xl3wb4rUqe9fkfAFPz7Z1sddTZQT+enIl J5i0Xrw9oifQ8G1Sa96eBJaAMtAtI/odG5NjlxeSAimUAQQsga8x3QqpyrGeX/b8ieh8xex iqZI6qcuekVdMlvp5D33WbcvdGxUWkVLv6HL39nAJ7bUqn6QnDeZkWyOIcinFlnqvosxWof zhaKwwUj5ty1g4GGZhnWKKC6gFuO7MdI2bE81drRTeMqQ/At5ztdkH3qoAO2HaFF2TrETmf mhkXZSP/RyO6LLIiEQIILIkbwq0vD1nTxJPur4PoXfF3AuEBVbuOCisCjfsXc/u3fYBAOlj xVHBAyF/Qm/K5QSitagFoMV1FNEx5vSwcEBdYhWaix7+8togKfNBQ9l/lxV+aHGKgg7shfS uYPkkcjHOGYxvNwI+51qKPsZbS1uJgeMjmn/XB37+7YUKVEP1OB7Am4RRSPDKg/X5I/2zqj 2Gk4OQrlOUreJ5RbYewLvmTGDeciMHLeTT9/68mXsIz3T9kkWO1/ftbc3p6NXv26Yok3Pvh 0R1qcOJh3wpu+1uM4sEuXSjlxnuBOMeXrNqxI+5xMTugh2slsTn22Klz/Hoh3luKP4LTOUF D3ZUefQkpaV+hOde2eqlkafgMZujml5Jc9HlPrd7PK0tL23xDR/oGAN1fFO7DUZhtLDPze7 JdQO5JuKWE9ATbbHxh5vfMG9nK7sh2kU3+a0m6NrK9k X-QQ-XMRINFO: OWPUhxQsoeAVwkVaQIEGSKwwgKCxK/fD5g== X-QQ-RECHKSPAM: 0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20261107_232029_288249_8B7011A5 X-CRM114-Status: GOOD ( 13.87 ) X-Spam-Score: -2.1 (--) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============6916046085891742582==" Sender: "linux-riscv" X-Spam-Status: No, score=-8.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_EF,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 --===============6916046085891742582== Content-Type: multipart/signed; boundary=a02f21ac2a7151b86497f96503bce060f3b96109e2e2f1aeb6516b655868; micalg=pgp-sha512; protocol="application/pgp-signature" --a02f21ac2a7151b86497f96503bce060f3b96109e2e2f1aeb6516b655868 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 On Sat Nov 7, 2026 at 5:32 PM GMT, Andrew Lunn wrote: > On Fri, Nov 06, 2026 at 03:44:50PM +0500, Ali Tariq wrote: >>=20 >>=20 >> On 11/6/26 2:43 PM, Troy Mitchell wrote: >> > On Thu, 5 Nov 2026 17:34:37 +0500, Ali Tariq wrote: >> > > @@ -2056,7 +2059,9 @@ static int emac_suspend(struct device *dev) >> > > return 0; >> > > } >> > > + rtnl_lock(); >> > > emac_stop(ndev); >> > > + rtnl_unlock(); >> > > clk_disable_unprepare(priv->bus_clk); >> > > netif_device_detach(ndev); >> > This can deadlock. emac_stop() -> emac_down() calls >> > cancel_work_sync(&priv->tx_timeout_task) with RTNL now held, while >> > emac_tx_timeout_task() starts with rtnl_lock(). >> >=20 >>=20 >> Thanks Troy, that makes sense. >>=20 >> For the deadlock, I think the correct function to call is rtnl_trylock() >> inside the emac_tx_timeout_task(), which would return if the lock is alr= eady >> held and will hold the lock if it is not. > > rtnl_trylock() is generally a workaround needed for badly written > code. Please try to avoid it. Agreed. If the reset is done in place, the work does not need RTNL at all, so .ndo_stop can keep cancel_work_sync() as is. --=20 Troy Mitchell --a02f21ac2a7151b86497f96503bce060f3b96109e2e2f1aeb6516b655868 Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iJcEABYKAD8WIQSL4Ay2cExaPXAQcU2YCe+A+TM0LwUCavAidyEcdHJveS5taXRj aGVsbEBsaW51eC5zcGFjZW1pdC5jb20ACgkQmAnvgPkzNC9B0gEA1znr4tPpsYVC nAv98ga0dRZipfyxeRX03GPDfyO2H9kA/0MZoMdmj9AE80+OsoJRT6mWefpeM6Si aoXyFnKOqZsD =cK0u -----END PGP SIGNATURE----- --a02f21ac2a7151b86497f96503bce060f3b96109e2e2f1aeb6516b655868-- --===============6916046085891742582== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv --===============6916046085891742582==--