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 61F74208BD for ; Mon, 6 Nov 2023 13:09:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="qW+cK49g" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D42A7C433C7; Mon, 6 Nov 2023 13:09:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1699276177; bh=y45diDur1vdDqvE+ZKomK/s3Cpn9hKTihbesGTmch1U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qW+cK49ggZOM/oeaFyuEIz7WMce2hBueSyNGcOZ84wNvxZ0ytLYnlBH5TSqGgVUXz kOkHYoyzbfOyxP5ktGPtdRkfNnRAv3gF15IBqEI5z6TxznEPNdKLU7XgxEw0qpejDW Ow8PFlcelFBbPtizZzXxKKqQt0obRieK0kQLSC7A= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Herve Codina , Peter Rosin , Jonathan Cameron , Wolfram Sang Subject: [PATCH 4.19 16/61] i2c: muxes: i2c-mux-gpmux: Use of_get_i2c_adapter_by_node() Date: Mon, 6 Nov 2023 14:03:12 +0100 Message-ID: <20231106130300.145646225@linuxfoundation.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231106130259.573843228@linuxfoundation.org> References: <20231106130259.573843228@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 4.19-stable review patch. If anyone has any objections, please let me know. ------------------ From: Herve Codina commit 3dc0ec46f6e7511fc4fdf6b6cda439382bc957f1 upstream. i2c-mux-gpmux uses the pair of_find_i2c_adapter_by_node() / i2c_put_adapter(). These pair alone is not correct to properly lock the I2C parent adapter. Indeed, i2c_put_adapter() decrements the module refcount while of_find_i2c_adapter_by_node() does not increment it. This leads to an underflow of the parent module refcount. Use the dedicated function, of_get_i2c_adapter_by_node(), to handle correctly the module refcount. Fixes: ac8498f0ce53 ("i2c: i2c-mux-gpmux: new driver") Signed-off-by: Herve Codina Cc: stable@vger.kernel.org Acked-by: Peter Rosin Reviewed-by: Jonathan Cameron Signed-off-by: Wolfram Sang Signed-off-by: Greg Kroah-Hartman --- drivers/i2c/muxes/i2c-mux-gpmux.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/i2c/muxes/i2c-mux-gpmux.c +++ b/drivers/i2c/muxes/i2c-mux-gpmux.c @@ -55,7 +55,7 @@ static struct i2c_adapter *mux_parent_ad dev_err(dev, "Cannot parse i2c-parent\n"); return ERR_PTR(-ENODEV); } - parent = of_find_i2c_adapter_by_node(parent_np); + parent = of_get_i2c_adapter_by_node(parent_np); of_node_put(parent_np); if (!parent) return ERR_PTR(-EPROBE_DEFER);