diff options
| author | Dave Gerlach <d-gerlach@ti.com> | 2019-12-11 22:03:14 -0600 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-02-05 13:05:49 +0000 |
| commit | 7f903eb9d203b37a96cf66a06ae3062fb6062c0a (patch) | |
| tree | c984cc4b820cc63871f046c30fb9ff647e559bc1 | |
| parent | c504c610756a30d6aa703a96f4a8a360bd4aa300 (diff) | |
soc: ti: wkup_m3_ipc: Fix race condition with rproc_boot
[ Upstream commit 03729cfa0d543bc996bf959e762ec999afc8f3d2 ]
Any user of wkup_m3_ipc calls wkup_m3_ipc_get to get a handle and this
checks the value of the static variable m3_ipc_state to see if the
wkup_m3 is ready. Currently this is populated during probe before
rproc_boot has been called, meaning there is a window of time that
wkup_m3_ipc_get can return a valid handle but the wkup_m3 itself is not
ready, leading to invalid IPC calls to the wkup_m3 and system
instability.
To avoid this, move the population of the m3_ipc_state variable until
after rproc_boot has succeeded to guarantee a valid and usable handle
is always returned.
Reported-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Dave Gerlach <d-gerlach@ti.com>
Acked-by: Santosh Shilimkar <ssantosh@kernel.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | drivers/soc/ti/wkup_m3_ipc.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/soc/ti/wkup_m3_ipc.c b/drivers/soc/ti/wkup_m3_ipc.c index 5bb376009d98..fc33bfdc957c 100644 --- a/drivers/soc/ti/wkup_m3_ipc.c +++ b/drivers/soc/ti/wkup_m3_ipc.c @@ -377,6 +377,8 @@ static void wkup_m3_rproc_boot_thread(struct wkup_m3_ipc *m3_ipc) ret = rproc_boot(m3_ipc->rproc); if (ret) dev_err(dev, "rproc_boot failed\n"); + else + m3_ipc_state = m3_ipc; do_exit(0); } @@ -463,8 +465,6 @@ static int wkup_m3_ipc_probe(struct platform_device *pdev) goto err_put_rproc; } - m3_ipc_state = m3_ipc; - return 0; err_put_rproc: |