From: Alex Elder <elder@linaro.org>
To: davem@davemloft.net, edumazet@google.com, kuba@kernel.org,
pabeni@redhat.com
Cc: mka@chromium.org, evgreen@chromium.org,
bjorn.andersson@linaro.org, quic_cpratapa@quicinc.com,
quic_avuyyuru@quicinc.com, quic_jponduru@quicinc.com,
quic_subashab@quicinc.com, elder@kernel.org,
netdev@vger.kernel.org, linux-arm-msm@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [PATCH net] net: ipa: don't assume SMEM is page-aligned
Date: Thu, 18 Aug 2022 08:42:05 -0500 [thread overview]
Message-ID: <20220818134206.567618-1-elder@linaro.org> (raw)
In ipa_smem_init(), a Qualcomm SMEM region is allocated (if needed)
and then its virtual address is fetched using qcom_smem_get(). The
physical address associated with that region is also fetched.
The physical address is adjusted so that it is page-aligned, and an
attempt is made to update the size of the region to compensate for
any non-zero adjustment.
But that adjustment isn't done properly. The physical address is
aligned twice, and as a result the size is never actually adjusted.
Fix this by *not* aligning the "addr" local variable, and instead
making the "phys" local variable be the adjusted "addr" value.
Fixes: a0036bb413d5b ("net: ipa: define SMEM memory region for IPA")
Signed-off-by: Alex Elder <elder@linaro.org>
---
drivers/net/ipa/ipa_mem.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/ipa/ipa_mem.c b/drivers/net/ipa/ipa_mem.c
index 1e9eae208e44f..53a1dbeaffa6d 100644
--- a/drivers/net/ipa/ipa_mem.c
+++ b/drivers/net/ipa/ipa_mem.c
@@ -568,7 +568,7 @@ static int ipa_smem_init(struct ipa *ipa, u32 item, size_t size)
}
/* Align the address down and the size up to a page boundary */
- addr = qcom_smem_virt_to_phys(virt) & PAGE_MASK;
+ addr = qcom_smem_virt_to_phys(virt);
phys = addr & PAGE_MASK;
size = PAGE_ALIGN(size + addr - phys);
iova = phys; /* We just want a direct mapping */
--
2.34.1
next reply other threads:[~2022-08-18 13:43 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-18 13:42 Alex Elder [this message]
2022-08-23 1:30 ` [PATCH net] net: ipa: don't assume SMEM is page-aligned patchwork-bot+netdevbpf
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