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https://github.com/Divested-Mobile/DivestOS-Build.git
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131 lines
4.1 KiB
Diff
131 lines
4.1 KiB
Diff
From d3237316314c3d6f75a58192971f66e3822cd250 Mon Sep 17 00:00:00 2001
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From: Siena Richard <sienar@codeaurora.org>
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Date: Thu, 26 Jan 2017 15:02:42 -0800
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Subject: drivers: soc: add mutex to prevent response being processed twice
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Add a mutex to prevent two threads from processing the same response
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at the same time. This ensures responses are processed completely and
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sequentially.
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CRs-Fixed: 1116015
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Change-Id: Id2ef32edb939f8af2850b54bd6f6f447939c0732
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Signed-off-by: Siena Richard <sienar@codeaurora.org>
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---
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drivers/soc/qcom/qdsp6v2/voice_svc.c | 26 ++++++++++++++++++++------
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1 file changed, 20 insertions(+), 6 deletions(-)
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diff --git a/drivers/soc/qcom/qdsp6v2/voice_svc.c b/drivers/soc/qcom/qdsp6v2/voice_svc.c
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index 50dd925..10f71b8 100644
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--- a/drivers/soc/qcom/qdsp6v2/voice_svc.c
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+++ b/drivers/soc/qcom/qdsp6v2/voice_svc.c
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@@ -1,4 +1,4 @@
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-/* Copyright (c) 2014-2016, The Linux Foundation. All rights reserved.
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+/* Copyright (c) 2014-2017, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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@@ -42,6 +42,12 @@ struct voice_svc_prvt {
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struct list_head response_queue;
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wait_queue_head_t response_wait;
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spinlock_t response_lock;
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+ /*
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+ * This mutex ensures responses are processed in sequential order and
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+ * that no two threads access and free the same response at the same
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+ * time.
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+ */
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+ struct mutex response_mutex_lock;
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};
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struct apr_data {
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@@ -467,6 +473,7 @@ static ssize_t voice_svc_read(struct file *file, char __user *arg,
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goto done;
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}
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+ mutex_lock(&prtd->response_mutex_lock);
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spin_lock_irqsave(&prtd->response_lock, spin_flags);
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if (list_empty(&prtd->response_queue)) {
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@@ -480,7 +487,7 @@ static ssize_t voice_svc_read(struct file *file, char __user *arg,
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pr_debug("%s: Read timeout\n", __func__);
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ret = -ETIMEDOUT;
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- goto done;
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+ goto unlock;
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} else if (ret > 0 && !list_empty(&prtd->response_queue)) {
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pr_debug("%s: Interrupt recieved for response\n",
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__func__);
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@@ -488,7 +495,7 @@ static ssize_t voice_svc_read(struct file *file, char __user *arg,
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pr_debug("%s: Interrupted by SIGNAL %d\n",
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__func__, ret);
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- goto done;
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+ goto unlock;
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}
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spin_lock_irqsave(&prtd->response_lock, spin_flags);
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@@ -507,7 +514,7 @@ static ssize_t voice_svc_read(struct file *file, char __user *arg,
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__func__, count, size);
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ret = -ENOMEM;
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- goto done;
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+ goto unlock;
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}
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if (!access_ok(VERIFY_WRITE, arg, size)) {
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@@ -515,7 +522,7 @@ static ssize_t voice_svc_read(struct file *file, char __user *arg,
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__func__);
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ret = -EPERM;
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- goto done;
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+ goto unlock;
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}
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ret = copy_to_user(arg, &resp->resp,
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@@ -525,7 +532,7 @@ static ssize_t voice_svc_read(struct file *file, char __user *arg,
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pr_err("%s: copy_to_user failed %d\n", __func__, ret);
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ret = -EPERM;
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- goto done;
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+ goto unlock;
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}
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spin_lock_irqsave(&prtd->response_lock, spin_flags);
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@@ -539,6 +546,8 @@ static ssize_t voice_svc_read(struct file *file, char __user *arg,
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ret = count;
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+unlock:
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+ mutex_unlock(&prtd->response_mutex_lock);
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done:
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return ret;
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}
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@@ -594,6 +603,7 @@ static int voice_svc_open(struct inode *inode, struct file *file)
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INIT_LIST_HEAD(&prtd->response_queue);
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init_waitqueue_head(&prtd->response_wait);
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spin_lock_init(&prtd->response_lock);
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+ mutex_init(&prtd->response_mutex_lock);
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file->private_data = (void *)prtd;
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/* Current APR implementation doesn't support session based
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@@ -644,6 +654,7 @@ static int voice_svc_release(struct inode *inode, struct file *file)
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pr_err("%s: Failed to dereg MVM %d\n", __func__, ret);
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}
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+ mutex_lock(&prtd->response_mutex_lock);
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spin_lock_irqsave(&prtd->response_lock, spin_flags);
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while (!list_empty(&prtd->response_queue)) {
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@@ -657,6 +668,9 @@ static int voice_svc_release(struct inode *inode, struct file *file)
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}
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spin_unlock_irqrestore(&prtd->response_lock, spin_flags);
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+ mutex_unlock(&prtd->response_mutex_lock);
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+
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+ mutex_destroy(&prtd->response_mutex_lock);
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kfree(file->private_data);
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file->private_data = NULL;
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--
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cgit v1.1
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