Messages in this thread Patch in this message | | | From | Christian Vogel <> | Subject | [PATCH 2/2] w1/ds2490: remove dump from ds_recv_status & less verbose | Date | Fri, 11 Mar 2022 20:28:33 +0100 |
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The ds_recv_status function has a "dump" parameter that is used only once, and mixes in extremely verbose debugging to the kernel log with fetching the status registers.
Removing the logging from ds_recv_status(), making logging explitic at the one place where it was used. Also decoding of the status register is turned off by default, and a module parameter added to re-enable.
Signed-off-by: Christian Vogel <vogelchr@vogel.cx> --- Documentation/w1/masters/ds2490.rst | 7 +++++++ drivers/w1/masters/ds2490.c | 28 +++++++++++++++++++--------- 2 files changed, 26 insertions(+), 9 deletions(-)
diff --git a/Documentation/w1/masters/ds2490.rst b/Documentation/w1/masters/ds2490.rst index 7e5b50f9c0f5..8aa455627aad 100644 --- a/Documentation/w1/masters/ds2490.rst +++ b/Documentation/w1/masters/ds2490.rst @@ -70,3 +70,10 @@ Notes and limitations. or the host OS and more likely the host OS. 03-06-2008 David Fries <David@Fries.net> + +Kernel Parameter +---------------- + +A kernel parameter verbose_dump=1 can be added to make the module +decode the status register on errors in a very verbose way. By default +this verbose decode is turned off. diff --git a/drivers/w1/masters/ds2490.c b/drivers/w1/masters/ds2490.c index f6664fc9596a..354a35726967 100644 --- a/drivers/w1/masters/ds2490.c +++ b/drivers/w1/masters/ds2490.c @@ -120,6 +120,10 @@ #define EP_DATA_OUT 2 #define EP_DATA_IN 3 +static int verbose_dump; +module_param(verbose_dump, int, 0644); +MODULE_PARM_DESC(verbose_dump, "Generate a very verbose dump of the status registers on errors."); + struct ds_device { struct list_head ds_entry; @@ -222,6 +226,9 @@ static void ds_dump_status(struct ds_device *dev, unsigned char *buf, int count) dev_info(&dev->udev->dev, "ep_status=0x%x, count=%d, status=%*phC", dev->ep[EP_STATUS], count, count, buf); + if (!verbose_dump) + return; + if (count >= 16) { ds_print_msg(buf, "enable flag", 0); ds_print_msg(buf, "1-wire speed", 1); @@ -266,8 +273,7 @@ static void ds_dump_status(struct ds_device *dev, unsigned char *buf, int count) } } -static int ds_recv_status(struct ds_device *dev, struct ds_status *st, - bool dump) +static int ds_recv_status(struct ds_device *dev, struct ds_status *st) { int count, err; @@ -286,9 +292,6 @@ static int ds_recv_status(struct ds_device *dev, struct ds_status *st, return err; } - if (dump) - ds_dump_status(dev, dev->st_buf, count); - if (st && count >= sizeof(*st)) memcpy(st, dev->st_buf, sizeof(*st)); @@ -329,9 +332,16 @@ static int ds_recv_data(struct ds_device *dev, unsigned char *buf, int size) err = usb_bulk_msg(dev->udev, usb_rcvbulkpipe(dev->udev, dev->ep[EP_DATA_IN]), buf, size, &count, 1000); if (err < 0) { + int recv_len; + dev_info(&dev->udev->dev, "Clearing ep0x%x.\n", dev->ep[EP_DATA_IN]); usb_clear_halt(dev->udev, usb_rcvbulkpipe(dev->udev, dev->ep[EP_DATA_IN])); - ds_recv_status(dev, NULL, true); + + /* status might tell us why endpoint is stuck? */ + recv_len = ds_recv_status(dev, NULL); + if (recv_len >= 0) + ds_dump_status(dev, dev->st_buf, recv_len); + return err; } @@ -377,7 +387,7 @@ int ds_stop_pulse(struct ds_device *dev, int limit) err = ds_send_control(dev, CTL_RESUME_EXE, 0); if (err) break; - err = ds_recv_status(dev, &st, false); + err = ds_recv_status(dev, &st); if (err) break; @@ -424,7 +434,7 @@ static int ds_wait_status(struct ds_device *dev, struct ds_status *st) do { st->status = 0; - err = ds_recv_status(dev, st, false); + err = ds_recv_status(dev, st); #if 0 if (err >= 0) { int i; @@ -721,7 +731,7 @@ static void ds9490r_search(void *data, struct w1_master *master, do { schedule_timeout(jtime); - err = ds_recv_status(dev, &st, false); + err = ds_recv_status(dev, &st); if (err < 0 || err < sizeof(st)) break; -- 2.35.1
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