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can: peak_usb: pcan_usb_handle_bus_evt(): fix reading rxerr/txerr values

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commit 590eb2b7d8cfafb27e8108d52d4bf4850626d31d upstream.

This patch fixes an incorrect way of reading error counters in messages
received for this purpose from the PCAN-USB interface. These messages
inform about the increase or decrease of the error counters, whose values
are placed in bytes 1 and 2 of the message data (not 0 and 1).

Fixes: ea8b33bde7 ("can: pcan_usb: add support of rxerr/txerr counters")
Link: https://lore.kernel.org/r/20210625130931.27438-4-s.grosjean@peak-system.com
Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Stephane Grosjean <s.grosjean@peak-system.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Stephane Grosjean 2021-06-25 15:09:29 +02:00 committed by Greg Kroah-Hartman
parent afe2ffd920
commit 2fc2c2816c
1 changed files with 6 additions and 4 deletions
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10
drivers/net/can/usb/peak_usb/pcan_usb.c
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@ -117,7 +117,8 @@ MODULE_SUPPORTED_DEVICE("PEAK-System PCAN-USB adapter");
#define PCAN_USB_BERR_MASK (PCAN_USB_ERR_RXERR | PCAN_USB_ERR_TXERR)
/* identify bus event packets with rx/tx error counters */
#define PCAN_USB_ERR_CNT 0x80
#define PCAN_USB_ERR_CNT_DEC 0x00 /* counters are decreasing */
#define PCAN_USB_ERR_CNT_INC 0x80 /* counters are increasing */
/* private to PCAN-USB adapter */
struct pcan_usb {
@ -611,11 +612,12 @@ static int pcan_usb_handle_bus_evt(struct pcan_usb_msg_context *mc, u8 ir)
/* acccording to the content of the packet */
switch (ir) {
case PCAN_USB_ERR_CNT:
case PCAN_USB_ERR_CNT_DEC:
case PCAN_USB_ERR_CNT_INC:
/* save rx/tx error counters from in the device context */
pdev->bec.rxerr = mc->ptr[0];
pdev->bec.txerr = mc->ptr[1];
pdev->bec.rxerr = mc->ptr[1];
pdev->bec.txerr = mc->ptr[2];
break;
default: