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| author | Laurence Oberman <loberman@redhat.com> | 2014-10-19 15:44:25 +0200 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2014-11-12 11:15:55 +0100 |
| commit | 2bec708a88ce053ffcb0dd8e373d1e46c6dc38a4 (patch) | |
| tree | 20eb3509ee246f92dc86fb2ddd9aa3ad08e93ef5 /Documentation/scsi/st.txt | |
| parent | scsi: add SG_SCSI_RESET_NO_ESCALATE flag to SG_SCSI_RESET ioctl (diff) | |
| download | linux-2bec708a88ce053ffcb0dd8e373d1e46c6dc38a4.tar.xz linux-2bec708a88ce053ffcb0dd8e373d1e46c6dc38a4.zip | |
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/st.txt')
| -rw-r--r-- | Documentation/scsi/st.txt | 8 |
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.) DEBUGGING HINTS -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 |