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cdc-acm: introduce a cool down

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Immediate submission in case of a babbling device can lead
to a busy loop. Introducing a delayed work.

Signed-off-by: Oliver Neukum <oneukum@suse.com>
Cc: stable <stable@vger.kernel.org>
Tested-by: Jonas Karlsson <jonas.karlsson@actia.se>
Link: https://lore.kernel.org/r/20200415151358.32664-2-oneukum@suse.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Oliver Neukum
2020-04-15 17:13:58 +02:00
committed by Greg Kroah-Hartman
parent 0afccd7601
commit a4e7279cd1
2 changed files with 32 additions and 3 deletions
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5
drivers/usb/class/cdc-acm.h
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@@ -109,8 +109,11 @@ struct acm {
# define EVENT_TTY_WAKEUP 0
# define EVENT_RX_STALL 1
# define ACM_THROTTLED 2
# define ACM_ERROR_DELAY 3
unsigned long urbs_in_error_delay; /* these need to be restarted after a delay */
struct usb_cdc_line_coding line; /* bits, stop, parity */
struct work_struct work; /* work queue entry for line discipline waking up */
struct work_struct work; /* work queue entry for various purposes*/
struct delayed_work dwork; /* for cool downs needed in error recovery */
unsigned int ctrlin; /* input control lines (DCD, DSR, RI, break, overruns) */
unsigned int ctrlout; /* output control lines (DTR, RTS) */
struct async_icount iocount; /* counters for control line changes */