linux-kernel - [PATCH v2 11/25] usb: gadget: f_tcm: Execute command on write completion

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Date:   Mon, 18 Jul 2022 18:27:12 -0700
From:   Thinh Nguyen <Thinh.Nguyen@...opsys.com>
To:     Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Dmitry Bogdanov <d.bogdanov@...ro.com>
Cc:     linux-scsi@...r.kernel.org, target-devel@...r.kernel.org
Subject: [PATCH v2 11/25] usb: gadget: f_tcm: Execute command on write completion

Don't just wait for the data write completion and execute the target
command. We need to verify if the request completed successfully and not
just sending invalid data. The verification is done in the write request
completion routine, so we can just run target_execute_cmd() there. The
wait for the data write is not needed.

Signed-off-by: Thinh Nguyen <Thinh.Nguyen@...opsys.com>
---
 Changes in v2:
 - None

 drivers/usb/gadget/function/f_tcm.c | 8 +-------
 drivers/usb/gadget/function/tcm.h   | 1 -
 2 files changed, 1 insertion(+), 8 deletions(-)

diff --git a/drivers/usb/gadget/function/f_tcm.c b/drivers/usb/gadget/function/f_tcm.c
index 6fea80afe2d7..ec83f2f9a858 100644
--- a/drivers/usb/gadget/function/f_tcm.c
+++ b/drivers/usb/gadget/function/f_tcm.c
@@ -248,7 +248,6 @@ static int bot_send_write_request(struct usbg_cmd *cmd)
 	struct usb_gadget *gadget = fuas_to_gadget(fu);
 	int ret;
 
-	init_completion(&cmd->write_complete);
 	cmd->fu = fu;
 
 	if (!cmd->data_len) {
@@ -279,8 +278,6 @@ static int bot_send_write_request(struct usbg_cmd *cmd)
 	if (ret)
 		pr_err("%s(%d)\n", __func__, __LINE__);
 
-	wait_for_completion(&cmd->write_complete);
-	target_execute_cmd(se_cmd);
 cleanup:
 	return ret;
 }
@@ -685,7 +682,6 @@ static int uasp_send_write_request(struct usbg_cmd *cmd)
 	struct sense_iu *iu = &cmd->sense_iu;
 	int ret;
 
-	init_completion(&cmd->write_complete);
 	cmd->fu = fu;
 
 	iu->tag = cpu_to_be16(cmd->tag);
@@ -717,8 +713,6 @@ static int uasp_send_write_request(struct usbg_cmd *cmd)
 			pr_err("%s(%d)\n", __func__, __LINE__);
 	}
 
-	wait_for_completion(&cmd->write_complete);
-	target_execute_cmd(se_cmd);
 cleanup:
 	return ret;
 }
@@ -955,7 +949,7 @@ static void usbg_data_write_cmpl(struct usb_ep *ep, struct usb_request *req)
 				se_cmd->data_length);
 	}
 
-	complete(&cmd->write_complete);
+	target_execute_cmd(se_cmd);
 	return;
 
 cleanup:
diff --git a/drivers/usb/gadget/function/tcm.h b/drivers/usb/gadget/function/tcm.h
index c7e6d36afd3a..5157af1b166b 100644
--- a/drivers/usb/gadget/function/tcm.h
+++ b/drivers/usb/gadget/function/tcm.h
@@ -74,7 +74,6 @@ struct usbg_cmd {
 	struct se_cmd se_cmd;
 	void *data_buf; /* used if no sg support available */
 	struct f_uas *fu;
-	struct completion write_complete;
 	struct kref ref;
 
 	struct usb_request *req;
-- 
2.28.0