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Date:   Wed,  9 Sep 2020 05:03:28 +0530
From:   Anant Thazhemadam <>
To:     unlisted-recipients:; (no To-header on input)
        Anant Thazhemadam <>,,,,,
        "David S. Miller" <>,
        Jakub Kicinski <>,
        Manivannan Sadhasivam <>,
        Bjorn Andersson <>,
        Masahiro Yamada <>,,
Subject: [PATCH] net: qrtr: Reintroduce ARCH_QCOM as a dependency for QRTR

Removing ARCH_QCOM, as a dependency for QRTR begins to give rise to
issues with respect to maintaining reference count integrity and
suspicious rcu usage.

The bugs resolved by making QRTR dependent on ARCH_QCOM include:

* WARNING: refcount bug in qrtr_node_lookup
* WARNING: refcount bug in qrtr_recvmsg
* WARNING: suspicious RCU usage in ctrl_cmd_new_lookup
* WARNING: suspicious RCU usage in qrtr_ns_worker

Signed-off-by: Anant Thazhemadam <>
As I understand it, QRTR was initially dependent upon ARCH_QCOM, but was 
removed since not all modems using IPC Router protocol required the 
support provided for Qualcomm platforms. 
However, wouldn't ARCH_QCOM be required by the modems that require the 
support provided for Qualcomm platforms?
The configuration ARCH_QCOM isn't exactly the easiest to find, especially, 
for those who don't know what they're looking for (syzbot included, I 
I don't feel like the tradeoff of not depending on ARCH_QCOM over giving 
rise to potential bugs is worth it. 
Is NOT having QRTR depend on ARCH_QCOM so critical that it supersedes the 
priority of not giving rise to potential bugs?

 net/qrtr/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/qrtr/Kconfig b/net/qrtr/Kconfig
index b4020b84760f..8156d0f3656b 100644
--- a/net/qrtr/Kconfig
+++ b/net/qrtr/Kconfig
@@ -4,6 +4,7 @@
 config QRTR
 	tristate "Qualcomm IPC Router support"
+	depends on ARCH_QCOM
 	  Say Y if you intend to use Qualcomm IPC router protocol.  The
 	  protocol is used to communicate with services provided by other

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