From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id ED6642D5940 for ; Tue, 17 Mar 2026 17:20:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773768004; cv=none; b=CeIPAhndVzrclc1MhgJgCDzNO4TP3udxgLLBzuba5GDLvayY9xRpElWn9iwlotCbkPnpQsQTFB+lXi8IyPSVpmcxu69icbXUnFmk0/I6YSN/Y11vZryXvyPD1NmLNU4n6rvm+Ojo5Md8K4fvEqCdGBwEMdih/Tq29B+gD8LHJ7s= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773768004; c=relaxed/simple; bh=UUyiHKHYl26f1FoHC+0eOkY5Oqzz73HVZoeNcQ4F/Co=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=UiCF+aCrKnNLRgw7R+n8SrpU05FTKa4Jtuc/TRz21pre3L1rrDnXvF1anxx2TJJUe+eaYU1n601OSKEWq0Rj5gA6dTZFoylLMzeP+m+P7xsfyrYjfiREVANLdfcyz3dW6PlfDjwXxie7xyin7ssrlnlPL/GG7AQ8hrGMLJcNatg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=AtjiTnf+; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="AtjiTnf+" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6E3A9C4CEF7; Tue, 17 Mar 2026 17:20:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1773768003; bh=UUyiHKHYl26f1FoHC+0eOkY5Oqzz73HVZoeNcQ4F/Co=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=AtjiTnf+DnytmDS2D8Oj0EP433gPntuGhevGwxYBhY8BQvCJz325V/npPVcJrJLVj tDVQ4H5NlnfCDKr6+9B+K1jrSmMOH2uUKRV0rwPMhyEWDv+3QxlQ99m8hTnStqK9D2 suBD7QOaKymJjAJn6htFgpPKrz9ACpzh/SJI+eQEOtOMbRmXA60qfsmPQwNjKsq5Mt +ecCRIry82uowmYyLhAktMQ4i3gdm9hproJjt+zTocu2+NDd+npOfxrbiuTOC/m9TV BowPGBjnZ+gzoMnAQ/9Tyw8GLSnOxJJ9/quF9pnQz4uxoK4ToY/Sn/qxXUar18Fu4b 4ioRLjgzwSDZw== From: Sasha Levin To: stable@vger.kernel.org Cc: Andy Shevchenko , =?UTF-8?q?Nuno=20S=C3=A1?= , Sakari Ailus , Heikki Krogerus , Michael Walle , "Rafael J. Wysocki" , Sasha Levin Subject: [PATCH 5.10.y 7/8] device property: Allow error pointer to be passed to fwnode APIs Date: Tue, 17 Mar 2026 13:19:53 -0400 Message-ID: <20260317171954.238398-7-sashal@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260317171954.238398-1-sashal@kernel.org> References: <2026031703-caravan-bladder-c63a@gregkh> <20260317171954.238398-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Andy Shevchenko [ Upstream commit 002752af7b89b74c64fe6bec8c5fde3d3a7810d8 ] Some of the fwnode APIs might return an error pointer instead of NULL or valid fwnode handle. The result of such API call may be considered optional and hence the test for it is usually done in a form of fwnode = fwnode_find_reference(...); if (IS_ERR(fwnode)) ...error handling... Nevertheless the resulting fwnode may have bumped the reference count and hence caller of the above API is obliged to call fwnode_handle_put(). Since fwnode may be not valid either as NULL or error pointer the check has to be performed there. This approach uglifies the code and adds a point of making a mistake, i.e. forgetting about error point case. To prevent this, allow an error pointer to be passed to the fwnode APIs. Fixes: 83b34afb6b79 ("device property: Introduce fwnode_find_reference()") Reported-by: Nuno Sá Tested-by: Nuno Sá Acked-by: Nuno Sá Reviewed-by: Sakari Ailus Reviewed-by: Heikki Krogerus Signed-off-by: Andy Shevchenko Tested-by: Michael Walle Signed-off-by: Rafael J. Wysocki Stable-dep-of: 2692c614f8f0 ("device property: Allow secondary lookup in fwnode_get_next_child_node()") Signed-off-by: Sasha Levin --- drivers/base/property.c | 89 +++++++++++++++++++++++------------------ include/linux/fwnode.h | 10 ++--- 2 files changed, 56 insertions(+), 43 deletions(-) diff --git a/drivers/base/property.c b/drivers/base/property.c index 7de58f4887860..ed767dc2630d0 100644 --- a/drivers/base/property.c +++ b/drivers/base/property.c @@ -48,12 +48,14 @@ bool fwnode_property_present(const struct fwnode_handle *fwnode, { bool ret; + if (IS_ERR_OR_NULL(fwnode)) + return false; + ret = fwnode_call_bool_op(fwnode, property_present, propname); - if (ret == false && !IS_ERR_OR_NULL(fwnode) && - !IS_ERR_OR_NULL(fwnode->secondary)) - ret = fwnode_call_bool_op(fwnode->secondary, property_present, - propname); - return ret; + if (ret) + return ret; + + return fwnode_call_bool_op(fwnode->secondary, property_present, propname); } EXPORT_SYMBOL_GPL(fwnode_property_present); @@ -233,15 +235,16 @@ static int fwnode_property_read_int_array(const struct fwnode_handle *fwnode, { int ret; + if (IS_ERR_OR_NULL(fwnode)) + return -EINVAL; + ret = fwnode_call_int_op(fwnode, property_read_int_array, propname, elem_size, val, nval); - if (ret == -EINVAL && !IS_ERR_OR_NULL(fwnode) && - !IS_ERR_OR_NULL(fwnode->secondary)) - ret = fwnode_call_int_op( - fwnode->secondary, property_read_int_array, propname, - elem_size, val, nval); + if (ret != -EINVAL) + return ret; - return ret; + return fwnode_call_int_op(fwnode->secondary, property_read_int_array, propname, + elem_size, val, nval); } /** @@ -372,14 +375,16 @@ int fwnode_property_read_string_array(const struct fwnode_handle *fwnode, { int ret; + if (IS_ERR_OR_NULL(fwnode)) + return -EINVAL; + ret = fwnode_call_int_op(fwnode, property_read_string_array, propname, val, nval); - if (ret == -EINVAL && !IS_ERR_OR_NULL(fwnode) && - !IS_ERR_OR_NULL(fwnode->secondary)) - ret = fwnode_call_int_op(fwnode->secondary, - property_read_string_array, propname, - val, nval); - return ret; + if (ret != -EINVAL) + return ret; + + return fwnode_call_int_op(fwnode->secondary, property_read_string_array, propname, + val, nval); } EXPORT_SYMBOL_GPL(fwnode_property_read_string_array); @@ -481,15 +486,19 @@ int fwnode_property_get_reference_args(const struct fwnode_handle *fwnode, { int ret; + if (IS_ERR_OR_NULL(fwnode)) + return -ENOENT; + ret = fwnode_call_int_op(fwnode, get_reference_args, prop, nargs_prop, nargs, index, args); + if (ret == 0) + return ret; - if (ret < 0 && !IS_ERR_OR_NULL(fwnode) && - !IS_ERR_OR_NULL(fwnode->secondary)) - ret = fwnode_call_int_op(fwnode->secondary, get_reference_args, - prop, nargs_prop, nargs, index, args); + if (IS_ERR_OR_NULL(fwnode->secondary)) + return ret; - return ret; + return fwnode_call_int_op(fwnode->secondary, get_reference_args, prop, nargs_prop, + nargs, index, args); } EXPORT_SYMBOL_GPL(fwnode_property_get_reference_args); @@ -683,12 +692,13 @@ EXPORT_SYMBOL_GPL(fwnode_count_parents); struct fwnode_handle *fwnode_get_nth_parent(struct fwnode_handle *fwnode, unsigned int depth) { - unsigned int i; - fwnode_handle_get(fwnode); - for (i = 0; i < depth && fwnode; i++) + do { + if (depth-- == 0) + break; fwnode = fwnode_get_next_parent(fwnode); + } while (fwnode); return fwnode; } @@ -707,17 +717,17 @@ EXPORT_SYMBOL_GPL(fwnode_get_nth_parent); bool fwnode_is_ancestor_of(struct fwnode_handle *test_ancestor, struct fwnode_handle *test_child) { - if (!test_ancestor) + if (IS_ERR_OR_NULL(test_ancestor)) return false; fwnode_handle_get(test_child); - while (test_child) { + do { if (test_child == test_ancestor) { fwnode_handle_put(test_child); return true; } test_child = fwnode_get_next_parent(test_child); - } + } while (test_child); return false; } @@ -746,7 +756,7 @@ fwnode_get_next_available_child_node(const struct fwnode_handle *fwnode, { struct fwnode_handle *next_child = child; - if (!fwnode) + if (IS_ERR_OR_NULL(fwnode)) return NULL; do { @@ -771,16 +781,16 @@ struct fwnode_handle *device_get_next_child_node(struct device *dev, const struct fwnode_handle *fwnode = dev_fwnode(dev); struct fwnode_handle *next; + if (IS_ERR_OR_NULL(fwnode)) + return NULL; + /* Try to find a child in primary fwnode */ next = fwnode_get_next_child_node(fwnode, child); if (next) return next; /* When no more children in primary, continue with secondary */ - if (fwnode && !IS_ERR_OR_NULL(fwnode->secondary)) - next = fwnode_get_next_child_node(fwnode->secondary, child); - - return next; + return fwnode_get_next_child_node(fwnode->secondary, child); } EXPORT_SYMBOL_GPL(device_get_next_child_node); @@ -847,6 +857,9 @@ EXPORT_SYMBOL_GPL(fwnode_handle_put); */ bool fwnode_device_is_available(const struct fwnode_handle *fwnode) { + if (IS_ERR_OR_NULL(fwnode)) + return false; + if (!fwnode_has_op(fwnode, device_is_available)) return true; @@ -1054,14 +1067,14 @@ fwnode_graph_get_next_endpoint(const struct fwnode_handle *fwnode, parent = fwnode_graph_get_port_parent(prev); else parent = fwnode; + if (IS_ERR_OR_NULL(parent)) + return NULL; ep = fwnode_call_ptr_op(parent, graph_get_next_endpoint, prev); + if (ep) + return ep; - if (IS_ERR_OR_NULL(ep) && - !IS_ERR_OR_NULL(parent) && !IS_ERR_OR_NULL(parent->secondary)) - ep = fwnode_graph_get_next_endpoint(parent->secondary, NULL); - - return ep; + return fwnode_graph_get_next_endpoint(parent->secondary, NULL); } EXPORT_SYMBOL_GPL(fwnode_graph_get_next_endpoint); diff --git a/include/linux/fwnode.h b/include/linux/fwnode.h index 9506f8ec09740..946eb9d74e393 100644 --- a/include/linux/fwnode.h +++ b/include/linux/fwnode.h @@ -149,12 +149,12 @@ struct fwnode_operations { struct device *dev); }; -#define fwnode_has_op(fwnode, op) \ - ((fwnode) && (fwnode)->ops && (fwnode)->ops->op) +#define fwnode_has_op(fwnode, op) \ + (!IS_ERR_OR_NULL(fwnode) && (fwnode)->ops && (fwnode)->ops->op) + #define fwnode_call_int_op(fwnode, op, ...) \ - (fwnode ? (fwnode_has_op(fwnode, op) ? \ - (fwnode)->ops->op(fwnode, ## __VA_ARGS__) : -ENXIO) : \ - -EINVAL) + (fwnode_has_op(fwnode, op) ? \ + (fwnode)->ops->op(fwnode, ## __VA_ARGS__) : (IS_ERR_OR_NULL(fwnode) ? -EINVAL : -ENXIO)) #define fwnode_call_bool_op(fwnode, op, ...) \ (fwnode_has_op(fwnode, op) ? \ -- 2.51.0