diff mbox series

[RFC,3/6] CDC-WDM: remove use of intf->dev after potential disconnect

Message ID 20200922101329.14801-4-oneukum@suse.com (mailing list archive)
State Superseded
Headers show
Series [RFC,1/6] CDC-WDM: fix hangs in flush() in multithreaded cases | expand

Commit Message

Oliver Neukum Sept. 22, 2020, 10:13 a.m. UTC 
After a disconnect intf->dev is not a valid pointer any longer.
As flush() uses it only for logging purposes logging is not
worth it. Remove the dev_err()

Reported-by: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Signed-off-by: Oliver Neukum <oneukum@suse.com>
---
 drivers/usb/class/cdc-wdm.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)
diff mbox series

Patch

diff --git a/drivers/usb/class/cdc-wdm.c b/drivers/usb/class/cdc-wdm.c
index b3a3f249a915..1ca2c85a977d 100644
--- a/drivers/usb/class/cdc-wdm.c
+++ b/drivers/usb/class/cdc-wdm.c
@@ -603,16 +603,17 @@  static int wdm_flush(struct file *file, fl_owner_t id)
 			test_bit(WDM_DISCONNECTING, &desc->flags),
 			WDM_FLUSH_TIMEOUT);
 
-	/* cannot dereference desc->intf if WDM_DISCONNECTING */
+	/*
+	 * to report the correct error.
+	 * This is best effort
+	 * We are inevitably racing with the hardware.
+	 */
 	if (test_bit(WDM_DISCONNECTING, &desc->flags))
 		return -ENODEV;
 	if (!rv)
 		return -EIO;
 
 	rv = desc->werr;
-	if (rv < 0)
-		dev_err(&desc->intf->dev, "Error in flush path: %d\n",
-			rv);
 
 	return usb_translate_errors(rv);
 }