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From 667de79718d03db9abc68a2a999fd4e072e3ad5e Mon Sep 17 00:00:00 2001
From: Joerg Roedel <joerg.roedel@amd.com>
Date: Thu, 26 Jan 2012 18:25:37 +0100
Subject: [PATCH 64/87] iommu/msm: Fix error handling in msm_iommu_unmap()
commit 05df1f3c2afaef5672627f2b7095f0d4c4dbc3a0 upstream.
Error handling in msm_iommu_unmap() is broken. On some error
conditions retval is set to a non-zero value which causes
the function to return 'len' at the end. This hides the
error from the user. Zero should be returned in those error
cases.
Cc: David Brown <davidb@codeaurora.org>
Cc: Stepan Moskovchenko <stepanm@codeaurora.org>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Acked-by: David Brown <davidb@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/iommu/msm_iommu.c | 7 +------
1 file changed, 1 insertion(+), 6 deletions(-)
diff --git a/drivers/iommu/msm_iommu.c b/drivers/iommu/msm_iommu.c
index 5865dd2..a4d134d 100644
--- a/drivers/iommu/msm_iommu.c
+++ b/drivers/iommu/msm_iommu.c
@@ -481,23 +481,19 @@ static int msm_iommu_unmap(struct iommu_domain *domain, unsigned long va,
priv = domain->priv;
- if (!priv) {
- ret = -ENODEV;
+ if (!priv)
goto fail;
- }
fl_table = priv->pgtable;
if (len != SZ_16M && len != SZ_1M &&
len != SZ_64K && len != SZ_4K) {
pr_debug("Bad length: %d\n", len);
- ret = -EINVAL;
goto fail;
}
if (!fl_table) {
pr_debug("Null page table\n");
- ret = -EINVAL;
goto fail;
}
@@ -506,7 +502,6 @@ static int msm_iommu_unmap(struct iommu_domain *domain, unsigned long va,
if (*fl_pte == 0) {
pr_debug("First level PTE is 0\n");
- ret = -ENODEV;
goto fail;
}
--
1.7.9.4
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