Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751788AbdHXHWl (ORCPT ); Thu, 24 Aug 2017 03:22:41 -0400 Received: from smtp.codeaurora.org ([198.145.29.96]:34598 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751708AbdHXHWi (ORCPT ); Thu, 24 Aug 2017 03:22:38 -0400 DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 9CD3B607A0 Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=sricharan@codeaurora.org From: Sricharan R To: ohad@wizery.com, bjorn.andersson@linaro.org, linux-remoteproc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: sricharan@codeaurora.org Subject: [PATCH v2 11/20] rpmsg: glink: Fix idr_lock from mutex to spinlock Date: Thu, 24 Aug 2017 12:51:33 +0530 Message-Id: <1503559302-3744-12-git-send-email-sricharan@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1503559302-3744-1-git-send-email-sricharan@codeaurora.org> References: <1503559302-3744-1-git-send-email-sricharan@codeaurora.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 8283 Lines: 251 The channel members lcids, rcids synchronised using the idr_lock is accessed in both atomic/non-atomic contexts. The readers are not currently synchronised. That no correct, so add the readers as well under the lock and use a spinlock. Signed-off-by: Sricharan R Signed-off-by: Bjorn Andersson --- drivers/rpmsg/qcom_glink_native.c | 58 +++++++++++++++++++++++++++------------ 1 file changed, 40 insertions(+), 18 deletions(-) diff --git a/drivers/rpmsg/qcom_glink_native.c b/drivers/rpmsg/qcom_glink_native.c index 777ac6b..588a56c 100644 --- a/drivers/rpmsg/qcom_glink_native.c +++ b/drivers/rpmsg/qcom_glink_native.c @@ -92,7 +92,7 @@ struct qcom_glink { struct mutex tx_lock; - struct mutex idr_lock; + spinlock_t idr_lock; struct idr lcids; struct idr rcids; unsigned long features; @@ -309,14 +309,15 @@ static int qcom_glink_send_open_req(struct qcom_glink *glink, int name_len = strlen(channel->name) + 1; int req_len = ALIGN(sizeof(req.msg) + name_len, 8); int ret; + unsigned long flags; kref_get(&channel->refcount); - mutex_lock(&glink->idr_lock); + spin_lock_irqsave(&glink->idr_lock, flags); ret = idr_alloc_cyclic(&glink->lcids, channel, RPM_GLINK_CID_MIN, RPM_GLINK_CID_MAX, GFP_KERNEL); - mutex_unlock(&glink->idr_lock); + spin_unlock_irqrestore(&glink->idr_lock, flags); if (ret < 0) return ret; @@ -334,10 +335,10 @@ static int qcom_glink_send_open_req(struct qcom_glink *glink, return 0; remove_idr: - mutex_lock(&glink->idr_lock); + spin_lock_irqsave(&glink->idr_lock, flags); idr_remove(&glink->lcids, channel->lcid); channel->lcid = 0; - mutex_unlock(&glink->idr_lock); + spin_unlock_irqrestore(&glink->idr_lock, flags); return ret; } @@ -463,6 +464,7 @@ static int qcom_glink_rx_data(struct qcom_glink *glink, size_t avail) unsigned int chunk_size; unsigned int left_size; unsigned int rcid; + unsigned long flags; if (avail < sizeof(hdr)) { dev_dbg(glink->dev, "Not enough data in fifo\n"); @@ -482,7 +484,9 @@ static int qcom_glink_rx_data(struct qcom_glink *glink, size_t avail) return -EINVAL; rcid = le16_to_cpu(hdr.msg.param1); + spin_lock_irqsave(&glink->idr_lock, flags); channel = idr_find(&glink->rcids, rcid); + spin_unlock_irqrestore(&glink->idr_lock, flags); if (!channel) { dev_dbg(glink->dev, "Data on non-existing channel\n"); @@ -543,11 +547,13 @@ static int qcom_glink_rx_open_ack(struct qcom_glink *glink, unsigned int lcid) { struct glink_channel *channel; + spin_lock(&glink->idr_lock); channel = idr_find(&glink->lcids, lcid); if (!channel) { dev_err(glink->dev, "Invalid open ack packet\n"); return -EINVAL; } + spin_unlock(&glink->idr_lock); complete(&channel->open_ack); @@ -621,6 +627,7 @@ static struct glink_channel *qcom_glink_create_local(struct qcom_glink *glink, { struct glink_channel *channel; int ret; + unsigned long flags; channel = qcom_glink_alloc_channel(glink, name); if (IS_ERR(channel)) @@ -644,9 +651,9 @@ static struct glink_channel *qcom_glink_create_local(struct qcom_glink *glink, err_timeout: /* qcom_glink_send_open_req() did register the channel in lcids*/ - mutex_lock(&glink->idr_lock); + spin_lock_irqsave(&glink->idr_lock, flags); idr_remove(&glink->lcids, channel->lcid); - mutex_unlock(&glink->idr_lock); + spin_unlock_irqrestore(&glink->idr_lock, flags); release_channel: /* Release qcom_glink_send_open_req() reference */ @@ -703,11 +710,14 @@ static struct rpmsg_endpoint *qcom_glink_create_ept(struct rpmsg_device *rpdev, const char *name = chinfo.name; int cid; int ret; + unsigned long flags; + spin_lock_irqsave(&glink->idr_lock, flags); idr_for_each_entry(&glink->rcids, channel, cid) { if (!strcmp(channel->name, name)) break; } + spin_unlock_irqrestore(&glink->idr_lock, flags); if (!channel) { channel = qcom_glink_create_local(glink, name); @@ -829,11 +839,14 @@ static int qcom_glink_rx_open(struct qcom_glink *glink, unsigned int rcid, struct device_node *node; int lcid; int ret; + unsigned long flags; + spin_lock_irqsave(&glink->idr_lock, flags); idr_for_each_entry(&glink->lcids, channel, lcid) { if (!strcmp(channel->name, name)) break; } + spin_unlock_irqrestore(&glink->idr_lock, flags); if (!channel) { channel = qcom_glink_alloc_channel(glink, name); @@ -844,15 +857,15 @@ static int qcom_glink_rx_open(struct qcom_glink *glink, unsigned int rcid, create_device = true; } - mutex_lock(&glink->idr_lock); + spin_lock_irqsave(&glink->idr_lock, flags); ret = idr_alloc(&glink->rcids, channel, rcid, rcid + 1, GFP_KERNEL); if (ret < 0) { dev_err(glink->dev, "Unable to insert channel into rcid list\n"); - mutex_unlock(&glink->idr_lock); + spin_unlock_irqrestore(&glink->idr_lock, flags); goto free_channel; } channel->rcid = ret; - mutex_unlock(&glink->idr_lock); + spin_unlock_irqrestore(&glink->idr_lock, flags); complete(&channel->open_req); @@ -886,10 +899,10 @@ static int qcom_glink_rx_open(struct qcom_glink *glink, unsigned int rcid, free_rpdev: kfree(rpdev); rcid_remove: - mutex_lock(&glink->idr_lock); + spin_lock_irqsave(&glink->idr_lock, flags); idr_remove(&glink->rcids, channel->rcid); channel->rcid = 0; - mutex_unlock(&glink->idr_lock); + spin_unlock_irqrestore(&glink->idr_lock, flags); free_channel: /* Release the reference, iff we took it */ if (create_device) @@ -902,8 +915,11 @@ static void qcom_glink_rx_close(struct qcom_glink *glink, unsigned int rcid) { struct rpmsg_channel_info chinfo; struct glink_channel *channel; + unsigned long flags; + spin_lock_irqsave(&glink->idr_lock, flags); channel = idr_find(&glink->rcids, rcid); + spin_unlock_irqrestore(&glink->idr_lock, flags); if (WARN(!channel, "close request on unknown channel\n")) return; @@ -917,10 +933,10 @@ static void qcom_glink_rx_close(struct qcom_glink *glink, unsigned int rcid) qcom_glink_send_close_ack(glink, channel->rcid); - mutex_lock(&glink->idr_lock); + spin_lock_irqsave(&glink->idr_lock, flags); idr_remove(&glink->rcids, channel->rcid); channel->rcid = 0; - mutex_unlock(&glink->idr_lock); + spin_unlock_irqrestore(&glink->idr_lock, flags); kref_put(&channel->refcount, qcom_glink_channel_release); } @@ -928,15 +944,18 @@ static void qcom_glink_rx_close(struct qcom_glink *glink, unsigned int rcid) static void qcom_glink_rx_close_ack(struct qcom_glink *glink, unsigned int lcid) { struct glink_channel *channel; + unsigned long flags; + spin_lock_irqsave(&glink->idr_lock, flags); channel = idr_find(&glink->lcids, lcid); - if (WARN(!channel, "close ack on unknown channel\n")) + if (WARN(!channel, "close ack on unknown channel\n")) { + spin_unlock_irqrestore(&glink->idr_lock, flags); return; + } - mutex_lock(&glink->idr_lock); idr_remove(&glink->lcids, channel->lcid); channel->lcid = 0; - mutex_unlock(&glink->idr_lock); + spin_unlock_irqrestore(&glink->idr_lock, flags); kref_put(&channel->refcount, qcom_glink_channel_release); } @@ -1017,7 +1036,7 @@ struct qcom_glink *qcom_glink_native_probe(struct device *dev, INIT_LIST_HEAD(&glink->rx_queue); INIT_WORK(&glink->rx_work, qcom_glink_work); - mutex_init(&glink->idr_lock); + spin_lock_init(&glink->idr_lock); idr_init(&glink->lcids); idr_init(&glink->rcids); @@ -1060,6 +1079,7 @@ void qcom_glink_native_remove(struct qcom_glink *glink) struct glink_channel *channel; int cid; int ret; + unsigned long flags; disable_irq(glink->irq); cancel_work_sync(&glink->rx_work); @@ -1068,12 +1088,14 @@ void qcom_glink_native_remove(struct qcom_glink *glink) if (ret) dev_warn(glink->dev, "Can't remove GLINK devices: %d\n", ret); + spin_lock_irqsave(&glink->idr_lock, flags); /* Release any defunct local channels, waiting for close-ack */ idr_for_each_entry(&glink->lcids, channel, cid) kref_put(&channel->refcount, qcom_glink_channel_release); idr_destroy(&glink->lcids); idr_destroy(&glink->rcids); + spin_unlock_irqrestore(&glink->idr_lock, flags); mbox_free_channel(glink->mbox_chan); } -- QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation