From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from phobos.denx.de (phobos.denx.de [85.214.62.61]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 91248C32771 for ; Fri, 19 Aug 2022 20:23:36 +0000 (UTC) Received: from h2850616.stratoserver.net (localhost [IPv6:::1]) by phobos.denx.de (Postfix) with ESMTP id 261C484603; Fri, 19 Aug 2022 22:23:34 +0200 (CEST) Authentication-Results: phobos.denx.de; dmarc=pass (p=none dis=none) header.from=suse.de Authentication-Results: phobos.denx.de; spf=pass smtp.mailfrom=u-boot-bounces@lists.denx.de Authentication-Results: phobos.denx.de; dkim=pass (1024-bit key; unprotected) header.d=suse.de header.i=@suse.de header.b="T/NcU9M0"; dkim=permerror (0-bit key) header.d=suse.de header.i=@suse.de header.b="zqkmkbYc"; dkim-atps=neutral Received: by phobos.denx.de (Postfix, from userid 109) id 86D04845FC; Fri, 19 Aug 2022 22:23:32 +0200 (CEST) Received: from smtp-out2.suse.de (smtp-out2.suse.de [IPv6:2001:67c:2178:6::1d]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) (No client certificate requested) by phobos.denx.de (Postfix) with ESMTPS id A27B684603 for ; Fri, 19 Aug 2022 22:23:28 +0200 (CEST) Authentication-Results: phobos.denx.de; dmarc=pass (p=none dis=none) header.from=suse.de Authentication-Results: phobos.denx.de; spf=pass smtp.mailfrom=msuchanek@suse.de Received: from relay2.suse.de (relay2.suse.de [149.44.160.134]) by smtp-out2.suse.de (Postfix) with ESMTP id 56FBE1FA81; Fri, 19 Aug 2022 20:23:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1660940608; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=/BVpKlOt3uziKyCg4S4QMby7LLZUWWLriH2KydJoYZY=; b=T/NcU9M0t1cfY1IKKBsEjeVZAtvJuRPZw0J7SO2jdgVsQ0gOzk51frn+rMBofurq9ua/ny xrhAMy+OgirQCmZZ/9Y5v3SKNBTztBUA8jCenvxFx5aE/DLMm/Ff75f/HQeJZcwUrygga+ B++lTpUhE0EykwA66rH9+81PTKJFwuk= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1660940608; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=/BVpKlOt3uziKyCg4S4QMby7LLZUWWLriH2KydJoYZY=; b=zqkmkbYcoRse/8sDa3UaCTuGro/WXuZSoNTGW5M8mAfXvKEnP5rLNwSIruEJ2AdiiyJBQ5 XTqyOCU8dtB7ERAA== Received: from naga.suse.cz (unknown [10.100.224.114]) by relay2.suse.de (Postfix) with ESMTP id 252302C141; Fri, 19 Aug 2022 20:23:28 +0000 (UTC) From: Michal Suchanek To: Simon Glass , U-Boot Mailing List Cc: Michal Suchanek , Marek Vasut , =?UTF-8?q?Viktor=20K=C5=99iv=C3=A1k?= , Pavel Herrmann , Tomas Hlavacek Subject: [PATCH v3] dm: core: Do not stop uclass iteration on error Date: Fri, 19 Aug 2022 22:23:22 +0200 Message-Id: <20220819202322.25701-1-msuchanek@suse.de> X-Mailer: git-send-email 2.37.1 In-Reply-To: <20220818194640.GC28810@kitsune.suse.cz> References: <20220818194640.GC28810@kitsune.suse.cz> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: u-boot@lists.denx.de X-Mailman-Version: 2.1.39 Precedence: list List-Id: U-Boot discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: u-boot-bounces@lists.denx.de Sender: "U-Boot" X-Virus-Scanned: clamav-milter 0.103.6 at phobos.denx.de X-Virus-Status: Clean When probing a device fails NULL pointer is returned, and other devices cannot be iterated. Skip to next device on error instead. Fixes: 6494d708bf ("dm: Add base driver model support") Signed-off-by: Michal Suchanek --- v2: - Fix up tests v3: - Fix up API doc - Correctly forward error from uclass_get - Do not return an error when last device fails to probe - Drop redundant initialization - Wrap at 80 columns --- drivers/core/uclass.c | 32 ++++++++++++++++++++++++-------- include/dm/uclass.h | 13 ++++++++----- test/dm/test-fdt.c | 20 ++++++++++++++++---- 3 files changed, 48 insertions(+), 17 deletions(-) diff --git a/drivers/core/uclass.c b/drivers/core/uclass.c index 08d9ed82de..8f4ecad26c 100644 --- a/drivers/core/uclass.c +++ b/drivers/core/uclass.c @@ -574,16 +574,35 @@ int uclass_get_device_by_phandle(enum uclass_id id, struct udevice *parent, } #endif +/* + * Starting from the given device return first device in the uclass that + * probes successfully. + */ +static int _uclass_next_device(struct udevice *dev, int ret, + struct udevice **devp) +{ + if (!dev) { + *devp = dev; + return ret; + } + while ((ret = uclass_get_device_tail(dev, ret, devp))) { + ret = uclass_find_next_device(&dev); + if (!dev) { + *devp = dev; + return 0; + } + } + + return 0; +} + int uclass_first_device(enum uclass_id id, struct udevice **devp) { struct udevice *dev; int ret; - *devp = NULL; ret = uclass_find_first_device(id, &dev); - if (!dev) - return 0; - return uclass_get_device_tail(dev, ret, devp); + return _uclass_next_device(dev, ret, devp); } int uclass_first_device_err(enum uclass_id id, struct udevice **devp) @@ -604,11 +623,8 @@ int uclass_next_device(struct udevice **devp) struct udevice *dev = *devp; int ret; - *devp = NULL; ret = uclass_find_next_device(&dev); - if (!dev) - return 0; - return uclass_get_device_tail(dev, ret, devp); + return _uclass_next_device(dev, ret, devp); } int uclass_next_device_err(struct udevice **devp) diff --git a/include/dm/uclass.h b/include/dm/uclass.h index f6c0110b06..76caa0d2b9 100644 --- a/include/dm/uclass.h +++ b/include/dm/uclass.h @@ -320,14 +320,14 @@ int uclass_get_device_by_driver(enum uclass_id id, const struct driver *drv, * uclass_first_device() - Get the first device in a uclass * * The device returned is probed if necessary, and ready for use + * Devices that fail to probe are skipped * * This function is useful to start iterating through a list of devices which * are functioning correctly and can be probed. * * @id: Uclass ID to look up * @devp: Returns pointer to the first device in that uclass if no error - * occurred, or NULL if there is no first device, or an error occurred with - * that device. + * occurred, or NULL if there is no usable device * Return: 0 if OK (found or not found), other -ve on error */ int uclass_first_device(enum uclass_id id, struct udevice **devp); @@ -336,6 +336,7 @@ int uclass_first_device(enum uclass_id id, struct udevice **devp); * uclass_first_device_err() - Get the first device in a uclass * * The device returned is probed if necessary, and ready for use + * Devices that fail to probe are skipped * * @id: Uclass ID to look up * @devp: Returns pointer to the first device in that uclass, or NULL if none @@ -347,14 +348,15 @@ int uclass_first_device_err(enum uclass_id id, struct udevice **devp); * uclass_next_device() - Get the next device in a uclass * * The device returned is probed if necessary, and ready for use + * Devices that fail to probe are skipped * * This function is useful to iterate through a list of devices which * are functioning correctly and can be probed. * * @devp: On entry, pointer to device to lookup. On exit, returns pointer * to the next device in the uclass if no error occurred, or NULL if there is - * no next device, or an error occurred with that next device. - * Return: 0 if OK (found or not found), other -ve on error + * no next device + * Return: 0 if OK (found or not found) */ int uclass_next_device(struct udevice **devp); @@ -362,11 +364,12 @@ int uclass_next_device(struct udevice **devp); * uclass_next_device_err() - Get the next device in a uclass * * The device returned is probed if necessary, and ready for use + * Devices that fail to probe are skipped * * @devp: On entry, pointer to device to lookup. On exit, returns pointer * to the next device in the uclass if no error occurred, or NULL if * there is no next device. - * Return: 0 if found, -ENODEV if not found, other -ve on error + * Return: 0 if found, -ENODEV if not found */ int uclass_next_device_err(struct udevice **devp); diff --git a/test/dm/test-fdt.c b/test/dm/test-fdt.c index 6118ad42ca..165b4f5554 100644 --- a/test/dm/test-fdt.c +++ b/test/dm/test-fdt.c @@ -417,16 +417,28 @@ static int dm_test_first_next_device(struct unit_test_state *uts) pdata = dev_get_plat(dev); pdata->probe_err = -ENOMEM; device_remove(parent, DM_REMOVE_NORMAL); - ut_assertok(uclass_first_device(UCLASS_TEST_PROBE, &dev)); - ut_asserteq(-ENOMEM, uclass_next_device(&dev)); - ut_asserteq_ptr(dev, NULL); + for (ret = uclass_first_device(UCLASS_TEST_PROBE, &dev), count = 0; + dev; + ret = uclass_next_device(&dev)) { + count++; + parent = dev_get_parent(dev); + } + ut_assertok(ret); + ut_asserteq(3, count); /* Now an error on the first one */ ut_assertok(uclass_get_device(UCLASS_TEST_PROBE, 0, &dev)); pdata = dev_get_plat(dev); pdata->probe_err = -ENOENT; device_remove(parent, DM_REMOVE_NORMAL); - ut_asserteq(-ENOENT, uclass_first_device(UCLASS_TEST_PROBE, &dev)); + for (ret = uclass_first_device(UCLASS_TEST_PROBE, &dev), count = 0; + dev; + ret = uclass_next_device(&dev)) { + count++; + parent = dev_get_parent(dev); + } + ut_assertok(ret); + ut_asserteq(2, count); return 0; } -- 2.37.1