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cdc-acm: handle read pipe errors

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Read urbs are submitted back only on success, causing read pipe
running out of urbs after few errors. No more characters can
be read from tty device then until it is reopened and no errors
are reported.
Fix that by always submitting urbs back and clearing stall on
-EPIPE.

Signed-off-by: Ladislav Michl <ladis@linux-mips.org>
Acked-by: Oliver Neukum <oneukum@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ladislav Michl
2016-11-18 19:11:26 +01:00
committed by Greg Kroah-Hartman
parent d305394ee8
commit 1aba579f3c
2 changed files with 53 additions and 10 deletions
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3
drivers/usb/class/cdc-acm.h
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@@ -103,6 +103,9 @@ struct acm {
spinlock_t write_lock;
struct mutex mutex;
bool disconnected;
unsigned long flags;
# define EVENT_TTY_WAKEUP 0
# define EVENT_RX_STALL 1
struct usb_cdc_line_coding line; /* bits, stop, parity */
struct work_struct work; /* work queue entry for line discipline waking up */
unsigned int ctrlin; /* input control lines (DCD, DSR, RI, break, overruns) */