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cdc-acm: correct counting of UART states in serial state notification

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The usb standard ("Universal Serial Bus Class Definitions for Communication
Devices") distiguishes between "consistent signals" (DSR, DCD), and
"irregular signals" (break, ring, parity error, framing error, overrun).
The bits of "irregular signals" are set, if this error/event occurred on
the device side and are immeadeatly unset, if the serial state notification
was sent.
Like other drivers of real serial ports do, just the occurence of those
events should be counted in serial_icounter_struct (but no 1->0
transitions).

Signed-off-by: Tobias Herzog <t-herzog@gmx.de>
Acked-by: Oliver Neukum <oneukum@suse.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tobias Herzog 2018-09-22 22:11:11 +02:00 committed by Greg Kroah-Hartman
parent dae3ddba36
commit f976d0e574
1 changed files with 7 additions and 7 deletions
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14
drivers/usb/class/cdc-acm.c
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@ -310,17 +310,17 @@ static void acm_process_notification(struct acm *acm, unsigned char *buf)
if (difference & ACM_CTRL_DSR)
acm->iocount.dsr++;
if (difference & ACM_CTRL_BRK)
acm->iocount.brk++;
if (difference & ACM_CTRL_RI)
acm->iocount.rng++;
if (difference & ACM_CTRL_DCD)
acm->iocount.dcd++;
if (difference & ACM_CTRL_FRAMING)
if (newctrl & ACM_CTRL_BRK)
acm->iocount.brk++;
if (newctrl & ACM_CTRL_RI)
acm->iocount.rng++;
if (newctrl & ACM_CTRL_FRAMING)
acm->iocount.frame++;
if (difference & ACM_CTRL_PARITY)
if (newctrl & ACM_CTRL_PARITY)
acm->iocount.parity++;
if (difference & ACM_CTRL_OVERRUN)
if (newctrl & ACM_CTRL_OVERRUN)
acm->iocount.overrun++;
spin_unlock_irqrestore(&acm->read_lock, flags);