lkml.org 
[lkml]   [2019]   [Aug]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[PATCH v6 5/7] usb: gadget: u_serial: diagnose missed console messages
Insert markers in console stream marking places where data
is missing. This makes the hole in the data stand out clearly
instead of glueing together unrelated messages.

Example output as seen from USB host side:

[ 0.064078] pinctrl core: registered pin 16 (UART3_RTS_N PC0) on 70000868.pinmux
[ 0.064130] pinctrl
[missed 114987 bytes]
[ 4.302299] udevd[134]: starting version 3.2.5
[ 4.306845] random: udevd: uninitialized urandom read (16 bytes read)

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
v6: rebased on balbi/testing/next
v5: no changes
v4: no changes
v3: added example output
+ lowercase "missed"
v2: commit message massage

---
drivers/usb/gadget/function/u_serial.c | 15 ++++++++++++++-
1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/gadget/function/u_serial.c b/drivers/usb/gadget/function/u_serial.c
index 0da00546006f..a248ed0fd5d2 100644
--- a/drivers/usb/gadget/function/u_serial.c
+++ b/drivers/usb/gadget/function/u_serial.c
@@ -88,6 +88,7 @@ struct gs_console {
spinlock_t lock;
struct usb_request *req;
struct kfifo buf;
+ size_t missed;
};

/*
@@ -931,6 +932,15 @@ static void __gs_console_push(struct gs_console *cons)
if (!size)
return;

+ if (cons->missed && ep->maxpacket >= 64) {
+ char buf[64];
+ size_t len;
+
+ len = sprintf(buf, "\n[missed %zu bytes]\n", cons->missed);
+ kfifo_in(&cons->buf, buf, len);
+ cons->missed = 0;
+ }
+
req->length = size;
if (usb_ep_queue(ep, req, GFP_ATOMIC))
req->length = 0;
@@ -952,10 +962,13 @@ static void gs_console_write(struct console *co,
{
struct gs_console *cons = container_of(co, struct gs_console, console);
unsigned long flags;
+ size_t n;

spin_lock_irqsave(&cons->lock, flags);

- kfifo_in(&cons->buf, buf, count);
+ n = kfifo_in(&cons->buf, buf, count);
+ if (n < count)
+ cons->missed += count - n;

if (cons->req && !cons->req->length)
schedule_work(&cons->work);
--
2.20.1
\
 
 \ /
  Last update: 2019-08-10 10:44    [W:0.051 / U:0.248 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site