path: root/Documentation/scsi
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authorLaurence Oberman <loberman@redhat.com>2014-10-19 09:44:25 -0400
committerChristoph Hellwig <hch@lst.de>2014-11-12 11:15:55 +0100
commit2bec708a88ce053ffcb0dd8e373d1e46c6dc38a4 (patch)
tree20eb3509ee246f92dc86fb2ddd9aa3ad08e93ef5 /Documentation/scsi
parent26cf591e6dfc0d07495b7bcf20a557b316811f00 (diff)
st: add a debug_flag module parameter request
This patch adds a debug_flag parameter that can be set on module load, and allows the DEBUG facility without a module recompile. Note that now DEBUG 1 is the default with this patch. Usage: modprobe st debug_flag=1 Signed-off-by: Laurence Oberman <loberman@redhat.com> Acked-by: Kai M??kisara <kai.makisara@kolumbus.fi> Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'Documentation/scsi')
1 files changed, 5 insertions, 3 deletions
diff --git a/Documentation/scsi/st.txt b/Documentation/scsi/st.txt
index f346abbdd6ff..0d5bdb153d3b 100644
--- a/Documentation/scsi/st.txt
+++ b/Documentation/scsi/st.txt
@@ -506,9 +506,11 @@ user does not request data that far.)
-To enable debugging messages, edit st.c and #define DEBUG 1. As seen
-above, debugging can be switched off with an ioctl if debugging is
-compiled into the driver. The debugging output is not voluminous.
+Debugging code is now compiled in by default but debugging is turned off
+with the kernel module parameter debug_flag defaulting to 0. Debugging
+can still be switched on and off with an ioctl. To enable debug at
+module load time add debug_flag=1 to the module load options, the
+debugging output is not voluminous.
If the tape seems to hang, I would be very interested to hear where
the driver is waiting. With the command 'ps -l' you can see the state

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