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a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:message-id:mime-version:subject:from :to:cc; bh=1vvOIzzfmOs0O6boLgQK9QNpOZbt5lBlooJwBHQhT2U=; b=nNkAW5TtabvF+YV+4AfqOhQnzmgtfMxhq3djOTt3Slj/W4Gy2ZP55b1m8vCqqJgTki fTXcQq+wr45fHZMw4Bu0ok0ide9hPV4genpOVjiJ9l9nEGgShcquSK/gOp7VFcX3XkSA V8Kzh8TzFmW1fAZmXmg7Qhh/vnJ4NRol2bmNveS/Anl6IFNHcdWuNCnYtWdTbJZt7k8k TEoEaGWSuLO4KblRFAhbP8mpBrSfVkNeu01cGYTYz/dtfygDktNf9A1hMJbh7FHY8t6V nbGGlAm9RQfhSOm+fNmBKKsAFQQY1ipnKgKY36Yw8Y70IrxjSkRBdDerXA57Y1QmDC5N GsFg== X-Gm-Message-State: AOAM5326Pf3o/185yThnT8co8mEG9rL6zZvx+AkHvbYQYT+Zlp379g+X laKEN97IbI2LDC5I+YDcZFTkTBDx0o7LHU0= X-Google-Smtp-Source: ABdhPJymkmTSF+HbRfB0kB1CFQgNV32Z56346vaDarmeDSDCTjhVagDmiPFft1q3oP266O0KB74jlyQAQdzga40= X-Received: from saravanak.san.corp.google.com ([2620:15c:2d:3:7220:84ff:fe09:fedc]) (user=saravanak job=sendgmr) by 2002:a0c:9c47:: with SMTP id w7mr34820545qve.59.1604523275590; Wed, 04 Nov 2020 12:54:35 -0800 (PST) Date: Wed, 4 Nov 2020 12:54:30 -0800 Message-Id: <20201104205431.3795207-1-saravanak@google.com> Mime-Version: 1.0 X-Mailer: git-send-email 2.29.1.341.ge80a0c044ae-goog Subject: [PATCH v1 1/2] driver core: Fix lockdep warning on wfs_lock From: Saravana Kannan To: Greg Kroah-Hartman , "Rafael J. Wysocki" , Matthias Brugger , Nathan Chancellor , Nick Desaulniers X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201104_205546_830809_32189678 X-CRM114-Status: GOOD ( 11.75 ) 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: Saravana Kannan , Cheng-Jui.Wang@mediatek.com, linux-kernel@vger.kernel.org, clang-built-linux@googlegroups.com, linux-mediatek@lists.infradead.org, kernel-team@android.com, linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org There's a potential deadlock with the following cycle: wfs_lock --> device_links_lock --> kn->count Fix this by simply dropping the lock around a list_empty() check that's just exported to a sysfs file. The sysfs file output is an instantaneous check anyway and the lock doesn't really add any protection. Lockdep log: [ 48.808132] [ 48.808132] the existing dependency chain (in reverse order) is: [ 48.809069] [ 48.809069] -> #2 (kn->count){++++}: [ 48.809707] __kernfs_remove.llvm.7860393000964815146+0x2d4/0x460 [ 48.810537] kernfs_remove_by_name_ns+0x54/0x9c [ 48.811171] sysfs_remove_file_ns+0x18/0x24 [ 48.811762] device_del+0x2b8/0x5a8 [ 48.812269] __device_link_del+0x98/0xb8 [ 48.812829] device_links_driver_bound+0x210/0x2d8 [ 48.813496] driver_bound+0x44/0xf8 [ 48.814000] really_probe+0x340/0x6e0 [ 48.814526] driver_probe_device+0xb8/0x100 [ 48.815117] device_driver_attach+0x78/0xb8 [ 48.815708] __driver_attach+0xe0/0x194 [ 48.816255] bus_for_each_dev+0xa8/0x11c [ 48.816816] driver_attach+0x24/0x30 [ 48.817331] bus_add_driver+0x100/0x1e0 [ 48.817880] driver_register+0x78/0x114 [ 48.818427] __platform_driver_register+0x44/0x50 [ 48.819089] 0xffffffdbb3227038 [ 48.819551] do_one_initcall+0xd8/0x1e0 [ 48.820099] do_init_module+0xd8/0x298 [ 48.820636] load_module+0x3afc/0x44c8 [ 48.821173] __arm64_sys_finit_module+0xbc/0xf0 [ 48.821807] el0_svc_common+0xbc/0x1d0 [ 48.822344] el0_svc_handler+0x74/0x98 [ 48.822882] el0_svc+0x8/0xc [ 48.823310] [ 48.823310] -> #1 (device_links_lock){+.+.}: [ 48.824036] __mutex_lock_common+0xe0/0xe44 [ 48.824626] mutex_lock_nested+0x28/0x34 [ 48.825185] device_link_add+0xd4/0x4ec [ 48.825734] of_link_to_suppliers+0x158/0x204 [ 48.826347] of_fwnode_add_links+0x50/0x64 [ 48.826928] device_link_add_missing_supplier_links+0x90/0x11c [ 48.827725] fw_devlink_resume+0x58/0x130 [ 48.828296] of_platform_default_populate_init+0xb4/0xd0 [ 48.829030] do_one_initcall+0xd8/0x1e0 [ 48.829578] do_initcall_level+0xb8/0xcc [ 48.830137] do_basic_setup+0x60/0x7c [ 48.830662] kernel_init_freeable+0x128/0x1ac [ 48.831275] kernel_init+0x18/0x29c [ 48.831781] ret_from_fork+0x10/0x18 [ 48.832297] [ 48.832297] -> #0 (wfs_lock){+.+.}: [ 48.832922] __lock_acquire+0xe04/0x2e20 [ 48.833480] lock_acquire+0xbc/0xec [ 48.833984] __mutex_lock_common+0xe0/0xe44 [ 48.834577] mutex_lock_nested+0x28/0x34 [ 48.835136] waiting_for_supplier_show+0x3c/0x98 [ 48.835781] dev_attr_show+0x48/0xb4 [ 48.836295] sysfs_kf_seq_show+0xe8/0x184 [ 48.836864] kernfs_seq_show+0x48/0x8c [ 48.837401] seq_read+0x1c8/0x600 [ 48.837884] kernfs_fop_read+0x68/0x204 [ 48.838431] __vfs_read+0x60/0x214 [ 48.838925] vfs_read+0xbc/0x15c [ 48.839397] ksys_read+0x78/0xe4 [ 48.839869] __arm64_sys_read+0x1c/0x28 [ 48.840416] el0_svc_common+0xbc/0x1d0 [ 48.840953] el0_svc_handler+0x74/0x98 [ 48.841490] el0_svc+0x8/0xc [ 48.841917] [ 48.841917] other info that might help us debug this: [ 48.841917] [ 48.842920] Chain exists of: [ 48.842920] wfs_lock --> device_links_lock --> kn->count [ 48.842920] [ 48.844152] Possible unsafe locking scenario: [ 48.844152] [ 48.844895] CPU0 CPU1 [ 48.845463] ---- ---- [ 48.846032] lock(kn->count); [ 48.846417] lock(device_links_lock); [ 48.847203] lock(kn->count); [ 48.847902] lock(wfs_lock); [ 48.848276] [ 48.848276] *** DEADLOCK *** Reported-by: Cheng-Jui.Wang@mediatek.com Signed-off-by: Saravana Kannan --- drivers/base/core.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/drivers/base/core.c b/drivers/base/core.c index 78114ddac755..df35b3206286 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -1064,10 +1064,8 @@ static ssize_t waiting_for_supplier_show(struct device *dev, bool val; device_lock(dev); - mutex_lock(&wfs_lock); val = !list_empty(&dev->links.needs_suppliers) && dev->links.need_for_probe; - mutex_unlock(&wfs_lock); device_unlock(dev); return sysfs_emit(buf, "%u\n", val); } From patchwork Wed Nov 4 20:54:31 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Saravana Kannan X-Patchwork-Id: 11883055 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_ADSP_CUSTOM_MED,DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5451EC00A89 for ; 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Wed, 04 Nov 2020 12:54:38 -0800 (PST) Date: Wed, 4 Nov 2020 12:54:31 -0800 In-Reply-To: <20201104205431.3795207-1-saravanak@google.com> Message-Id: <20201104205431.3795207-2-saravanak@google.com> Mime-Version: 1.0 References: <20201104205431.3795207-1-saravanak@google.com> X-Mailer: git-send-email 2.29.1.341.ge80a0c044ae-goog Subject: [PATCH v1 2/2] spi: Populate fwnode in of_register_spi_device() From: Saravana Kannan To: Greg Kroah-Hartman , "Rafael J. Wysocki" , Matthias Brugger , Nathan Chancellor , Nick Desaulniers , Mark Brown X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201104_205547_345578_4CFAE6FA X-CRM114-Status: GOOD ( 11.92 ) 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: Saravana Kannan , Cheng-Jui.Wang@mediatek.com, linux-kernel@vger.kernel.org, linux-spi@vger.kernel.org, clang-built-linux@googlegroups.com, linux-mediatek@lists.infradead.org, Daniel Mentz , kernel-team@android.com, linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Daniel Mentz This allows the fw_devlink feature to work for spi devices too. This avoids unnecessary probe deferrals related to spi devices and improves suspend/resume ordering for spi devices when fw_devlink=on. Signed-off-by: Daniel Mentz [saravanak: Minor commit text cleanup] Signed-off-by: Saravana Kannan --- drivers/spi/spi.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index 0cab239d8e7f..d533aa939cca 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -2037,6 +2037,7 @@ of_register_spi_device(struct spi_controller *ctlr, struct device_node *nc) /* Store a pointer to the node in the device structure */ of_node_get(nc); spi->dev.of_node = nc; + spi->dev.fwnode = of_fwnode_handle(nc); /* Register the new device */ rc = spi_add_device(spi);