diff options
Diffstat (limited to 'drivers/scsi/st.c')
| -rw-r--r-- | drivers/scsi/st.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c index b37b9b00c4b4..e0a1e52a04e7 100644 --- a/drivers/scsi/st.c +++ b/drivers/scsi/st.c @@ -4452,11 +4452,41 @@ static ssize_t version_show(struct device_driver *ddd, char *buf) } static DRIVER_ATTR_RO(version); +#if DEBUG +static ssize_t debug_flag_store(struct device_driver *ddp, + const char *buf, size_t count) +{ +/* We only care what the first byte of the data is the rest is unused. + * if it's a '1' we turn on debug and if it's a '0' we disable it. All + * other values have -EINVAL returned if they are passed in. + */ + if (count > 0) { + if (buf[0] == '0') { + debugging = NO_DEBUG; + return count; + } else if (buf[0] == '1') { + debugging = 1; + return count; + } + } + return -EINVAL; +} + +static ssize_t debug_flag_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%d\n", debugging); +} +static DRIVER_ATTR_RW(debug_flag); +#endif + static struct attribute *st_drv_attrs[] = { &driver_attr_try_direct_io.attr, &driver_attr_fixed_buffer_size.attr, &driver_attr_max_sg_segs.attr, &driver_attr_version.attr, +#if DEBUG + &driver_attr_debug_flag.attr, +#endif NULL, }; ATTRIBUTE_GROUPS(st_drv); |