From patchwork Wed Mar 9 10:57:13 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Archit Taneja X-Patchwork-Id: 8545181 Return-Path: X-Original-To: patchwork-dri-devel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id F277D9FC82 for ; Wed, 9 Mar 2016 10:57:48 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 1422820165 for ; Wed, 9 Mar 2016 10:57:48 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) by mail.kernel.org (Postfix) with ESMTP id B759A202E5 for ; Wed, 9 Mar 2016 10:57:45 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 6B3046E8D4; Wed, 9 Mar 2016 10:57:41 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from smtp.codeaurora.org (smtp.codeaurora.org [198.145.29.96]) by gabe.freedesktop.org (Postfix) with ESMTPS id 5498A6E8CB for ; Wed, 9 Mar 2016 10:57:34 +0000 (UTC) Received: from smtp.codeaurora.org (localhost [127.0.0.1]) by smtp.codeaurora.org (Postfix) with ESMTP id 34C5A60F91; Wed, 9 Mar 2016 10:57:34 +0000 (UTC) Received: by smtp.codeaurora.org (Postfix, from userid 1000) id 1BA7460F32; Wed, 9 Mar 2016 10:57:34 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 Received: from localhost (unknown [202.46.23.61]) (using TLSv1.2 with cipher DHE-RSA-AES128-SHA (128/128 bits)) (No client certificate requested) (Authenticated sender: architt@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id 667F460EC5; Wed, 9 Mar 2016 10:57:32 +0000 (UTC) From: Archit Taneja To: dri-devel@lists.freedesktop.org Subject: [PATCH v3 2/7] drm/i2c: adv7511: Fix mutex deadlock when interrupts are disabled Date: Wed, 9 Mar 2016 16:27:13 +0530 Message-Id: <1457521038-5906-3-git-send-email-architt@codeaurora.org> X-Mailer: git-send-email 1.8.2.1 In-Reply-To: <1457521038-5906-1-git-send-email-architt@codeaurora.org> References: <1441625800-1858-1-git-send-email-architt@codeaurora.org> <1457521038-5906-1-git-send-email-architt@codeaurora.org> X-Virus-Scanned: ClamAV using ClamSMTP Cc: andy.green@linaro.org, linux-arm-msm@vger.kernel.org, amit.kucheria@linaro.org, srinivas.kandagatla@linaro.org, laurent.pinchart@ideasonboard.com, treding@nvidia.com X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" X-Virus-Scanned: ClamAV using ClamSMTP When the adv7511 i2c client doesn't have an interrupt line, we observe a deadlock on caused by trying to lock drm device's mode_config.mutex twice in the same context. Here is the sequence that causes it: ioctl DRM_IOCTL_MODE_GETCONNECTOR from userspace drm_mode_getconnector (acquires mode_config mutex) connector->fill_modes() drm_helper_probe_single_connector_modes connector_funcs->get_modes adv7511_encoder_get_modes adv7511_get_edid_block adv7511_irq_process drm_helper_hpd_irq_event (acquires mode_config mutex again) In adv7511_irq_process, don't call drm_helper_hpd_irq_event when not called from the interrupt handler. It doesn't serve any purpose there anyway. Signed-off-by: Archit Taneja --- drivers/gpu/drm/i2c/adv7511.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/i2c/adv7511.c b/drivers/gpu/drm/i2c/adv7511.c index fec5627..c00d11d 100644 --- a/drivers/gpu/drm/i2c/adv7511.c +++ b/drivers/gpu/drm/i2c/adv7511.c @@ -427,7 +427,7 @@ static bool adv7511_hpd(struct adv7511 *adv7511) return false; } -static int adv7511_irq_process(struct adv7511 *adv7511) +static int adv7511_irq_process(struct adv7511 *adv7511, bool process_hpd) { unsigned int irq0, irq1; int ret; @@ -443,7 +443,7 @@ static int adv7511_irq_process(struct adv7511 *adv7511) regmap_write(adv7511->regmap, ADV7511_REG_INT(0), irq0); regmap_write(adv7511->regmap, ADV7511_REG_INT(1), irq1); - if (irq0 & ADV7511_INT0_HPD && adv7511->bridge.encoder) + if (process_hpd && irq0 & ADV7511_INT0_HPD && adv7511->bridge.encoder) drm_helper_hpd_irq_event(adv7511->connector.dev); if (irq0 & ADV7511_INT0_EDID_READY || irq1 & ADV7511_INT1_DDC_ERROR) { @@ -461,7 +461,7 @@ static irqreturn_t adv7511_irq_handler(int irq, void *devid) struct adv7511 *adv7511 = devid; int ret; - ret = adv7511_irq_process(adv7511); + ret = adv7511_irq_process(adv7511, true); return ret < 0 ? IRQ_NONE : IRQ_HANDLED; } @@ -478,7 +478,7 @@ static int adv7511_wait_for_edid(struct adv7511 *adv7511, int timeout) adv7511->edid_read, msecs_to_jiffies(timeout)); } else { for (; timeout > 0; timeout -= 25) { - ret = adv7511_irq_process(adv7511); + ret = adv7511_irq_process(adv7511, false); if (ret < 0) break;