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authorAlan Stern <stern@rowland.harvard.edu>2015-11-20 19:53:22 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-12-01 19:44:19 +0100
commit0290cc9f044a4d24d9a64e81761ac84498dc9d73 (patch)
tree5b6692337e2312a7c561e89829ac9d09aefea015 /Documentation/kernel-parameters.txt
parentLinux 4.4-rc3 (diff)
downloadlinux-0290cc9f044a4d24d9a64e81761ac84498dc9d73.tar.xz
linux-0290cc9f044a4d24d9a64e81761ac84498dc9d73.zip
USB: limit usbfs snooping of URB contents
The usbfs_snoop facility can be very useful for debugging problems involving usbfs. However, it always prints out the entire contents of every URB. When dealing with large quantities of data, this can be less than helpful. This patch ameliorates the situation by adding a module parameter to usbcore for controlling the maximum number of bytes to print when snooping an URB. This makes debugging much easier. For backward compatibility, the default value is set unreasonably high. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation/kernel-parameters.txt')
-rw-r--r--Documentation/kernel-parameters.txt4
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 742f69d18fc8..e6b6e056cc11 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -3874,6 +3874,10 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
usbcore.usbfs_snoop=
[USB] Set to log all usbfs traffic (default 0 = off).
+ usbcore.usbfs_snoop_max=
+ [USB] Maximum number of bytes to snoop in each URB
+ (default = 65536).
+
usbcore.blinkenlights=
[USB] Set to cycle leds on hubs (default 0 = off).