[PATCH 5.6 33/41] CDC-ACM: heed quirk also in error handling

[Greg Kroah-Hartman]

From: Oliver Neukum <oneukum@xxxxxxxx>

commit 97fe809934dd2b0b37dfef3a2fc70417f485d7af upstream.

If buffers are iterated over in the error case, the lower limits
for quirky devices must be heeded.

Signed-off-by: Oliver Neukum <oneukum@xxxxxxxx>
Reported-by: Jean Rene Dawin <jdawin@xxxxxxxxxxxxxxxxxxxxx>
Fixes: a4e7279cd1d19 ("cdc-acm: introduce a cool down")
Cc: stable <stable@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20200526124420.22160-1-oneukum@xxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/usb/class/cdc-acm.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -584,7 +584,7 @@ static void acm_softint(struct work_stru
 	}
 
 	if (test_and_clear_bit(ACM_ERROR_DELAY, &acm->flags)) {
-		for (i = 0; i < ACM_NR; i++)
+		for (i = 0; i < acm->rx_buflimit; i++)
 			if (test_and_clear_bit(i, &acm->urbs_in_error_delay))
 					acm_submit_read_urb(acm, i, GFP_NOIO);
 	}