linux-stable/net/qrtr
Maxim Kochetkov 68a838b84e net: qrtr: start MHI channel after endpoit creation
MHI channel may generates event/interrupt right after enabling.
It may leads to 2 race conditions issues.

1)
Such event may be dropped by qcom_mhi_qrtr_dl_callback() at check:

	if (!qdev || mhi_res->transaction_status)
		return;

Because dev_set_drvdata(&mhi_dev->dev, qdev) may be not performed at
this moment. In this situation qrtr-ns will be unable to enumerate
services in device.
---------------------------------------------------------------

2)
Such event may come at the moment after dev_set_drvdata() and
before qrtr_endpoint_register(). In this case kernel will panic with
accessing wrong pointer at qcom_mhi_qrtr_dl_callback():

	rc = qrtr_endpoint_post(&qdev->ep, mhi_res->buf_addr,
				mhi_res->bytes_xferd);

Because endpoint is not created yet.
--------------------------------------------------------------
So move mhi_prepare_for_transfer_autoqueue after endpoint creation
to fix it.

Fixes: a2e2cc0dbb ("net: qrtr: Start MHI channels during init")
Signed-off-by: Maxim Kochetkov <fido_max@inbox.ru>
Reviewed-by: Hemant Kumar <quic_hemantk@quicinc.com>
Reviewed-by: Manivannan Sadhasivam <mani@kernel.org>
Reviewed-by: Loic Poulain <loic.poulain@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2022-08-15 11:21:42 +01:00
..
af_qrtr.c net: remove noblock parameter from skb_recv_datagram() 2022-04-06 13:45:26 +01:00
Kconfig treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
Makefile net: qrtr: combine nameservice into main module 2021-09-28 17:36:43 -07:00
mhi.c net: qrtr: start MHI channel after endpoit creation 2022-08-15 11:21:42 +01:00
ns.c net: qrtr: ns: Fix error return code in qrtr_ns_init() 2021-05-19 13:14:35 -07:00
qrtr.h net: qrtr: fix null-ptr-deref in qrtr_ns_remove 2021-01-05 16:50:09 -08:00
smd.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 284 2019-06-05 17:36:37 +02:00
tun.c net: qrtr: Fix memory leak in qrtr_tun_open 2021-02-23 15:38:22 -08:00