usb: gadget: f_tcm: Don't set static stream_id

Host can assign stream ID value greater than number of streams
allocated. The tcm function needs to keep track of which stream is
available to assign the stream ID. This patch doesn't track that, but at
least it makes sure that there's no Oops if the host send tag with a
value greater than the number of supported streams.

Signed-off-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Link: https://lore.kernel.org/r/d57b7dfd228199cef811206b1b83ec649f742752.1733876548.git.Thinh.Nguyen@synopsys.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/gadget/function/f_tcm.c b/drivers/usb/gadget/function/f_tcm.c
index a908bbd04b0970e87905e64937691efa16a0663c..a594ed1359fc04a411e01ec18511e0a920f7874d 100644 (file)
--- a/drivers/usb/gadget/function/f_tcm.c
+++ b/drivers/usb/gadget/function/f_tcm.c
@@ -511,6 +511,7 @@ static int uasp_prepare_r_request(struct usbg_cmd *cmd)
        }
 
        stream->req_in->is_last = 1;
+       stream->req_in->stream_id = cmd->tag;
        stream->req_in->complete = uasp_status_data_cmpl;
        stream->req_in->length = se_cmd->data_length;
        stream->req_in->context = cmd;
@@ -535,6 +536,7 @@ static void uasp_prepare_status(struct usbg_cmd *cmd)
        iu->len = cpu_to_be16(se_cmd->scsi_sense_length);
        iu->status = se_cmd->scsi_status;
        stream->req_status->is_last = 1;
+       stream->req_status->stream_id = cmd->tag;
        stream->req_status->context = cmd;
        stream->req_status->length = se_cmd->scsi_sense_length + 16;
        stream->req_status->buf = iu;
@@ -765,19 +767,6 @@ err:
        return -ENOMEM;
 }
 
-static void uasp_setup_stream_res(struct f_uas *fu, int max_streams)
-{
-       int i;
-
-       for (i = 0; i < max_streams; i++) {
-               struct uas_stream *s = &fu->stream[i];
-
-               s->req_in->stream_id = i + 1;
-               s->req_out->stream_id = i + 1;
-               s->req_status->stream_id = i + 1;
-       }
-}
-
 static int uasp_prepare_reqs(struct f_uas *fu)
 {
        int ret;
@@ -798,7 +787,6 @@ static int uasp_prepare_reqs(struct f_uas *fu)
        ret = uasp_alloc_cmd(fu);
        if (ret)
                goto err_free_stream;
-       uasp_setup_stream_res(fu, max_streams);
 
        ret = usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
        if (ret)
@@ -975,6 +963,7 @@ static int usbg_prepare_w_request(struct usbg_cmd *cmd, struct usb_request *req)
        }
 
        req->is_last = 1;
+       req->stream_id = cmd->tag;
        req->complete = usbg_data_write_cmpl;
        req->length = se_cmd->data_length;
        req->context = cmd;