class: msc: stage change should be before usbd_ep_start_write()

- stage change should be before usbd_ep_start_write()

Signed-off-by: Zhihong Chen <[email protected]>

1 files changed, 2 insertions, 2 deletions

diff --git a/class/msc/usbd_msc.c b/class/msc/usbd_msc.c
index 5599690b..055cdc4e 100644
--- a/class/msc/usbd_msc.c
+++ b/class/msc/usbd_msc.c
@@ -679,8 +679,6 @@ static bool SCSI_processRead(uint8_t busid)
         return false;
     }
 
-    usbd_ep_start_write(busid, mass_ep_data[busid][MSD_IN_EP_IDX].ep_addr, g_usbd_msc[busid].block_buffer, transfer_len);
-
     g_usbd_msc[busid].start_sector += (transfer_len / g_usbd_msc[busid].scsi_blk_size[g_usbd_msc[busid].cbw.bLUN]);
     g_usbd_msc[busid].nsectors -= (transfer_len / g_usbd_msc[busid].scsi_blk_size[g_usbd_msc[busid].cbw.bLUN]);
     g_usbd_msc[busid].csw.dDataResidue -= transfer_len;
@@ -689,6 +687,8 @@ static bool SCSI_processRead(uint8_t busid)
         g_usbd_msc[busid].stage = MSC_SEND_CSW;
     }
 
+    usbd_ep_start_write(busid, mass_ep_data[busid][MSD_IN_EP_IDX].ep_addr, g_usbd_msc[busid].block_buffer, transfer_len);
+
     return true;
 }