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| author | Robin Gong <yibin.gong@nxp.com> | 2023-08-07 15:14:29 +0300 |
|---|---|---|
| committer | Shawn Guo <shawnguo@kernel.org> | 2023-08-11 17:14:02 +0300 |
| commit | 19a72e0cb06de380c6259d1ca02aea2c99c1e175 (patch) | |
| tree | a99d537f054e7eb5c2803f4a9ea960a3ec1d77a0 | |
| parent | 8314aa8af4f9905dded47e53b3e283e632736d41 (diff) | |
| download | linux-19a72e0cb06de380c6259d1ca02aea2c99c1e175.tar.xz | |
firmware: imx: scu-irq: fix RCU complaint after M4 partition reset
Use blocking_notifier_chain instead of atomic_notifier_chain, otherwise
there will be RCU complaint, because unregister/register_virtio_device()
will issue mbox message.
mbox_send_message() is blocking again after received M4 partition reset.
Actually, no need atomic notifier for scu irq notification since this
notifier is called in worker instead of interrupt handler.
[ 389.706645] i2c-rpmsg virtio0.rpmsg-i2c-channel.-1.2: i2c rpmsg driver is removed
[ 389.767362] Wait for remote ready timeout, use first_notify.
[ 389.774084] ------------[ cut here ]------------
[ 389.778729] WARNING: CPU: 0 PID: 397 at kernel/rcu/tree_plugin.h:293 rcu_note_context_switch+0x34/0x338
[ 389.788131] Modules linked in:
[ 389.791195] CPU: 0 PID: 397 Comm: kworker/0:13 Not tainted 5.4.0-rc5-02977-g08f78722f07b #26
[ 389.799633] Hardware name: Freescale i.MX8DXL MEK (DT)
[ 389.805481] Workqueue: events imx_scu_irq_work_handler
Signed-off-by: Robin Gong <yibin.gong@nxp.com>
Reviewed-by: Dong Aisheng <aisheng.dong@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
| -rw-r--r-- | drivers/firmware/imx/imx-scu-irq.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/firmware/imx/imx-scu-irq.c b/drivers/firmware/imx/imx-scu-irq.c index d9dcc20945c6..4408f150b3d5 100644 --- a/drivers/firmware/imx/imx-scu-irq.c +++ b/drivers/firmware/imx/imx-scu-irq.c @@ -42,25 +42,25 @@ struct imx_sc_msg_irq_enable { static struct imx_sc_ipc *imx_sc_irq_ipc_handle; static struct work_struct imx_sc_irq_work; -static ATOMIC_NOTIFIER_HEAD(imx_scu_irq_notifier_chain); +static BLOCKING_NOTIFIER_HEAD(imx_scu_irq_notifier_chain); int imx_scu_irq_register_notifier(struct notifier_block *nb) { - return atomic_notifier_chain_register( + return blocking_notifier_chain_register( &imx_scu_irq_notifier_chain, nb); } EXPORT_SYMBOL(imx_scu_irq_register_notifier); int imx_scu_irq_unregister_notifier(struct notifier_block *nb) { - return atomic_notifier_chain_unregister( + return blocking_notifier_chain_unregister( &imx_scu_irq_notifier_chain, nb); } EXPORT_SYMBOL(imx_scu_irq_unregister_notifier); static int imx_scu_irq_notifier_call_chain(unsigned long status, u8 *group) { - return atomic_notifier_call_chain(&imx_scu_irq_notifier_chain, + return blocking_notifier_call_chain(&imx_scu_irq_notifier_chain, status, (void *)group); } |