Hello
I am tired of building modules to enable SCSI tape driver debug so I
am hoping this patch is acceptable.
Tested using kernel 3.14.6
Usage example:
modprobe st debug_flag=1
diff -Nur a/st.c b/st.c
--- a/st.c 2014-06-10 16:45:18.522354105 -0400
+++ b/st.c 2014-06-10 16:45:33.953765908 -0400
@@ -80,6 +80,7 @@
static int try_direct_io = TRY_DIRECT_IO;
static int try_rdio = 1;
static int try_wdio = 1;
+static int debug_flag = 0;
static struct class st_sysfs_class;
static const struct attribute_group *st_dev_groups[];
@@ -100,6 +101,9 @@
MODULE_PARM_DESC(max_sg_segs, "Maximum number of scatter/gather
segments to use (256)");
module_param_named(try_direct_io, try_direct_io, int, 0);
MODULE_PARM_DESC(try_direct_io, "Try direct I/O between user buffer
and tape drive (1)");
+module_param_named(debug_flag, debug_flag, int, 0);
+MODULE_PARM_DESC(debug_flag, "Enable DEBUG, same as setting DEBUG 1
in source");
+
/* Extra parameters for testing */
module_param_named(try_rdio, try_rdio, int, 0);
@@ -124,6 +128,9 @@
},
{
"try_direct_io", &try_direct_io
+ },
+ {
+ "debug_flag", &debug_flag
}
};
#endif
@@ -4277,7 +4284,9 @@
static int __init init_st(void)
{
int err;
-
+ debugging = (debug_flag > 0) ? debug_flag : DEBUG;
+ if (debugging)
+ printk(KERN_INFO "st: Debugging enabled debug_flag =
%d\n",debugging);
validate_options();
printk(KERN_INFO "st: Version %s, fixed bufsize %d, s/g segs %d\n",
Thanks
Laurence
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