media: venus: core: handle race condititon for core ops

For core ops we are having only write protect but there
is no read protect, because of this in multithreading
and concurrency, one CPU core is reading without wait
which is causing the NULL pointer dereferece crash.

one such scenario is as show below, where in one CPU
core, core->ops becoming NULL and in another CPU core
calling core->ops->session_init().

CPU: core-7:
Call trace:
hfi_session_init+0x180/0x1dc [venus_core]
vdec_queue_setup+0x9c/0x364 [venus_dec]
vb2_core_reqbufs+0x1e4/0x368 [videobuf2_common]
vb2_reqbufs+0x4c/0x64 [videobuf2_v4l2]
v4l2_m2m_reqbufs+0x50/0x84 [v4l2_mem2mem]
v4l2_m2m_ioctl_reqbufs+0x2c/0x38 [v4l2_mem2mem]
v4l_reqbufs+0x4c/0x5c
__video_do_ioctl+0x2b0/0x39c

CPU: core-0:
Call trace:
venus_shutdown+0x98/0xfc [venus_core]
venus_sys_error_handler+0x64/0x148 [venus_core]
process_one_work+0x210/0x3d0
worker_thread+0x248/0x3f4
kthread+0x11c/0x12c

Signed-off-by: Mansur Alisha Shaik <[e-mail]>
Signed-off-by: Stanimir Varbanov <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

drivers/media/platform/qcom/venus/hfi.c

···
 	const struct hfi_ops *ops = core->ops;
 	int ret;
 
+	/*
+	 * If core shutdown is in progress or if we are in system
+	 * recovery, return an error as during system error recovery
+	 * session_init() can't pass successfully
+	 */
+	mutex_lock(&core->lock);
+	if (!core->ops || core->sys_error) {
+		mutex_unlock(&core->lock);
+		return -EIO;
+	}
+	mutex_unlock(&core->lock);
+
 	if (inst->state != INST_UNINIT)
 		return -EINVAL;