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[62.78.225.252]) by smtp.gmail.com with ESMTPSA id x17-20020ac25dd1000000b004f155743899sm1386872lfq.92.2023.05.12.00.53.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 12 May 2023 00:53:04 -0700 (PDT) Date: Fri, 12 May 2023 10:53:00 +0300 From: Matti Vaittinen To: Matti Vaittinen , Matti Vaittinen Cc: Andy Shevchenko , Daniel Scally , Heikki Krogerus , Sakari Ailus , Greg Kroah-Hartman , "Rafael J. Wysocki" , Wolfram Sang , Matti Vaittinen , Jonathan Cameron , Lars-Peter Clausen , Akhil R , linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, linux-i2c@vger.kernel.org, linux-iio@vger.kernel.org Subject: [PATCH v3 1/3] drivers: fwnode: fix fwnode_irq_get_byname() Message-ID: <9dd75817886fbb2a0cc58e2248dbba52d8a6d908.1683875389.git.mazziesaccount@gmail.com> References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM, RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1765674203501864608?= X-GMAIL-MSGID: =?utf-8?q?1765674203501864608?= The fwnode_irq_get_byname() does return 0 upon device-tree IRQ mapping failure. This is contradicting the function documentation and can potentially be a source of errors like: int probe(...) { ... irq = fwnode_irq_get_byname(); if (irq <= 0) return irq; ... } Here we do correctly check the return value from fwnode_irq_get_byname() but the driver probe will now return success. (There was already one such user in-tree). Change the fwnode_irq_get_byname() to work as documented and according to the common convention and abd always return a negative errno upon failure. Fixes: ca0acb511c21 ("device property: Add fwnode_irq_get_byname") Suggested-by: Sakari Ailus Reviewed-by: Sakari Ailus Reviewed-by: Andy Shevchenko Signed-off-by: Matti Vaittinen --- drivers/base/property.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/drivers/base/property.c b/drivers/base/property.c index f6117ec9805c..a3b95d2d781f 100644 --- a/drivers/base/property.c +++ b/drivers/base/property.c @@ -1011,7 +1011,7 @@ EXPORT_SYMBOL(fwnode_irq_get); */ int fwnode_irq_get_byname(const struct fwnode_handle *fwnode, const char *name) { - int index; + int index, ret; if (!name) return -EINVAL; @@ -1020,7 +1020,12 @@ int fwnode_irq_get_byname(const struct fwnode_handle *fwnode, const char *name) if (index < 0) return index; - return fwnode_irq_get(fwnode, index); + ret = fwnode_irq_get(fwnode, index); + /* We treat mapping errors as invalid case */ + if (ret == 0) + return -EINVAL; + + return ret; } EXPORT_SYMBOL(fwnode_irq_get_byname);