From patchwork Tue Apr 5 07:29:27 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 557355 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 584D7C433F5 for ; Tue, 5 Apr 2022 10:09:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1353722AbiDEKJC (ORCPT ); Tue, 5 Apr 2022 06:09:02 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44282 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1345314AbiDEJWZ (ORCPT ); Tue, 5 Apr 2022 05:22:25 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1A43C43389; Tue, 5 Apr 2022 02:10:25 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 9070C614FC; Tue, 5 Apr 2022 09:10:24 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9930AC385A0; Tue, 5 Apr 2022 09:10:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1649149824; bh=jpH1FFqHwA9Rcvx435BbU8+Ijry2x5lxT/g9E4on9Sg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=jxOtjWoivyK8oriC7ruazGHIU1QBCQCm7ioTEnR6Oarh9vt5UhRp90055mJLIriWk oj9ofKr2fbaZWHXU4s0JvNHWcAauNt+S4ToefpoEq5dSK4VcLop82LbPXYv/Rc63Fo I9tc5exSNNl2JUl/xENIWoMS7IHOkF8Kls4cUEIg= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Ulf Hansson , Sasha Levin Subject: [PATCH 5.16 0854/1017] mmc: host: Return an error when ->enable_sdio_irq() ops is missing Date: Tue, 5 Apr 2022 09:29:27 +0200 Message-Id: <20220405070419.586137766@linuxfoundation.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220405070354.155796697@linuxfoundation.org> References: <20220405070354.155796697@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Ulf Hansson [ Upstream commit d6c9219ca1139b74541b2a98cee47a3426d754a9 ] Even if the current WARN() notifies the user that something is severely wrong, we can still end up in a PANIC() when trying to invoke the missing ->enable_sdio_irq() ops. Therefore, let's also return an error code and prevent the host from being added. While at it, move the code into a separate function to prepare for subsequent changes and for further host caps validations. Signed-off-by: Ulf Hansson Link: https://lore.kernel.org/r/20220303165142.129745-1-ulf.hansson@linaro.org Signed-off-by: Sasha Levin --- drivers/mmc/core/host.c | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-) diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c index cf140f4ec864..d739e2b631fe 100644 --- a/drivers/mmc/core/host.c +++ b/drivers/mmc/core/host.c @@ -588,6 +588,16 @@ struct mmc_host *mmc_alloc_host(int extra, struct device *dev) EXPORT_SYMBOL(mmc_alloc_host); +static int mmc_validate_host_caps(struct mmc_host *host) +{ + if (host->caps & MMC_CAP_SDIO_IRQ && !host->ops->enable_sdio_irq) { + dev_warn(host->parent, "missing ->enable_sdio_irq() ops\n"); + return -EINVAL; + } + + return 0; +} + /** * mmc_add_host - initialise host hardware * @host: mmc host @@ -600,8 +610,9 @@ int mmc_add_host(struct mmc_host *host) { int err; - WARN_ON((host->caps & MMC_CAP_SDIO_IRQ) && - !host->ops->enable_sdio_irq); + err = mmc_validate_host_caps(host); + if (err) + return err; err = device_add(&host->class_dev); if (err)