media: staging: rkisp1: params: don't release lock in isr before buffer is done

In the irq handler 'rkisp1_params_isr', the lock 'config_lock'
should be held as long as the current buffer is used. Otherwise the
stop_streaming calback might remove it from the list and
pass it to userspace while it is referenced in the irq handler.

Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@collabora.com>
Acked-by: Helen Koike <helen.koike@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

diff --git a/drivers/staging/media/rkisp1/rkisp1-params.c b/drivers/staging/media/rkisp1/rkisp1-params.c
index fcd1641..3ca2afc 100644 (file)
--- a/drivers/staging/media/rkisp1/rkisp1-params.c
+++ b/drivers/staging/media/rkisp1/rkisp1-params.c
@@ -1202,10 +1202,11 @@ void rkisp1_params_isr(struct rkisp1_device *rkisp1)
        if (!list_empty(&params->params))
                cur_buf = list_first_entry(&params->params,
                                           struct rkisp1_buffer, queue);
-       spin_unlock(&params->config_lock);
 
-       if (!cur_buf)
+       if (!cur_buf) {
+               spin_unlock(&params->config_lock);
                return;
+       }
 
        new_params = (struct rkisp1_params_cfg *)(cur_buf->vaddr);
 
@@ -1215,12 +1216,11 @@ void rkisp1_params_isr(struct rkisp1_device *rkisp1)
        /* update shadow register immediately */
        rkisp1_param_set_bits(params, RKISP1_CIF_ISP_CTRL, RKISP1_CIF_ISP_CTRL_ISP_CFG_UPD);
 
-       spin_lock(&params->config_lock);
        list_del(&cur_buf->queue);
-       spin_unlock(&params->config_lock);
 
        cur_buf->vb.sequence = frame_sequence;
        vb2_buffer_done(&cur_buf->vb.vb2_buf, VB2_BUF_STATE_DONE);
+       spin_unlock(&params->config_lock);
 }
 
 static const struct rkisp1_cif_isp_awb_meas_config rkisp1_awb_params_default_config = {