media: pvrusb2: use a different format for warnings

When the pvrusb2 driver detects that there's something wrong with the
device, it prints a warning message. Right now those message are
printed in two different formats:

1. ***WARNING*** message here
2. WARNING: message here

There's an issue with the second format. Syzkaller recognizes it as a
message produced by a WARN_ON(), which is used to indicate a bug in the
kernel. However pvrusb2 prints those warnings to indicate an issue with
the device, not the bug in the kernel.

This patch changes the pvrusb2 driver to consistently use the first
warning message format. This will unblock syzkaller testing of this
driver.

Reported-by: syzbot+af8f8d2ac0d39b0ed3a0@syzkaller.appspotmail.com
Reported-by: syzbot+170a86bf206dd2c6217e@syzkaller.appspotmail.com
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

diff --git a/drivers/media/usb/pvrusb2/pvrusb2-hdw.c b/drivers/media/usb/pvrusb2/pvrusb2-hdw.c
index 816c857..1914391 100644 (file)
--- a/drivers/media/usb/pvrusb2/pvrusb2-hdw.c
+++ b/drivers/media/usb/pvrusb2/pvrusb2-hdw.c
@@ -1680,7 +1680,7 @@ static int pvr2_decoder_enable(struct pvr2_hdw *hdw,int enablefl)
        }
        if (!hdw->flag_decoder_missed) {
                pvr2_trace(PVR2_TRACE_ERROR_LEGS,
-                          "WARNING: No decoder present");
+                          "***WARNING*** No decoder present");
                hdw->flag_decoder_missed = !0;
                trace_stbit("flag_decoder_missed",
                            hdw->flag_decoder_missed);
@@ -2366,7 +2366,7 @@ struct pvr2_hdw *pvr2_hdw_create(struct usb_interface *intf,
        if (hdw_desc->flag_is_experimental) {
                pvr2_trace(PVR2_TRACE_INFO, "**********");
                pvr2_trace(PVR2_TRACE_INFO,
-                          "WARNING: Support for this device (%s) is experimental.",
+                          "***WARNING*** Support for this device (%s) is experimental.",
                                                              hdw_desc->description);
                pvr2_trace(PVR2_TRACE_INFO,
                           "Important functionality might not be entirely working.");

diff --git a/drivers/media/usb/pvrusb2/pvrusb2-i2c-core.c b/drivers/media/usb/pvrusb2/pvrusb2-i2c-core.c
index 8f02308..43e54bd 100644 (file)
--- a/drivers/media/usb/pvrusb2/pvrusb2-i2c-core.c
+++ b/drivers/media/usb/pvrusb2/pvrusb2-i2c-core.c
@@ -343,11 +343,11 @@ static int i2c_hack_cx25840(struct pvr2_hdw *hdw,
 
        if ((ret != 0) || (*rdata == 0x04) || (*rdata == 0x0a)) {
                pvr2_trace(PVR2_TRACE_ERROR_LEGS,
-                          "WARNING: Detected a wedged cx25840 chip; the device will not work.");
+                          "***WARNING*** Detected a wedged cx25840 chip; the device will not work.");
                pvr2_trace(PVR2_TRACE_ERROR_LEGS,
-                          "WARNING: Try power cycling the pvrusb2 device.");
+                          "***WARNING*** Try power cycling the pvrusb2 device.");
                pvr2_trace(PVR2_TRACE_ERROR_LEGS,
-                          "WARNING: Disabling further access to the device to prevent other foul-ups.");
+                          "***WARNING*** Disabling further access to the device to prevent other foul-ups.");
                // This blocks all further communication with the part.
                hdw->i2c_func[0x44] = NULL;
                pvr2_hdw_render_useless(hdw);

diff --git a/drivers/media/usb/pvrusb2/pvrusb2-std.c b/drivers/media/usb/pvrusb2/pvrusb2-std.c
index 6b651f8..37dc299 100644 (file)
--- a/drivers/media/usb/pvrusb2/pvrusb2-std.c
+++ b/drivers/media/usb/pvrusb2/pvrusb2-std.c
@@ -353,7 +353,7 @@ struct v4l2_standard *pvr2_std_create_enum(unsigned int *countptr,
                bcnt = pvr2_std_id_to_str(buf,sizeof(buf),fmsk);
                pvr2_trace(
                        PVR2_TRACE_ERROR_LEGS,
-                       "WARNING: Failed to classify the following standard(s): %.*s",
+                       "***WARNING*** Failed to classify the following standard(s): %.*s",
                        bcnt,buf);
        }