linux-kernel - [PATCH -next] iommu/dma: Fix missing mutex_init() in iommu_get_msi

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Date:   Mon, 27 Jun 2022 16:55:33 +0800
From:   Yang Yingliang <yangyingliang@...wei.com>
To:     <linux-kernel@...r.kernel.org>, <iommu@...ts.linux.dev>,
        <iommu@...ts.linux-foundation.org>
CC:     <joro@...tes.org>, <will@...nel.org>, <yf.wang@...iatek.com>
Subject: [PATCH -next] iommu/dma: Fix missing mutex_init() in iommu_get_msi_cookie()

cookie_alloc() is called by iommu_get_dma_cookie() and iommu_get_msi_cookie(),
but the mutex is only initialized in iommu_get_dma_cookie(), move mutex_init()
into cookie_alloc() to make sure the mutex will be initialized.

Fixes: ac9a5d522bb8 ("iommu/dma: Fix race condition during iova_domain initialization")
Reported-by: Hulk Robot <hulkci@...wei.com>
Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
---
 drivers/iommu/dma-iommu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index 1910f4f1612b..e29157380c48 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -294,6 +294,7 @@ static struct iommu_dma_cookie *cookie_alloc(enum iommu_dma_cookie_type type)
 	if (cookie) {
 		INIT_LIST_HEAD(&cookie->msi_page_list);
 		cookie->type = type;
+		mutex_init(&cookie->mutex);
 	}
 	return cookie;
 }
@@ -311,7 +312,6 @@ int iommu_get_dma_cookie(struct iommu_domain *domain)
 	if (!domain->iova_cookie)
 		return -ENOMEM;
 
-	mutex_init(&domain->iova_cookie->mutex);
 	return 0;
 }
 
-- 
2.25.1