This patch enables setting the module's debug options WARN and INFO in the
debugfs file 'wilc_debug_level'. This functionality allows the user to
enable logging of warnings and other information. Before this change,
writes to this debugfs file set only one option - DEBUG. Another option
that is enabled by default is ERR.
As a side effect, this patch removes the 'sparse' warning -
'warning: incorrect type in argument 2 (different address spaces)'.
Signed-off-by: Chandra S Gorentla <csgorentla@xxxxxxxxx>
---
Changes in v3: Added back a printk that was removed from v1
Changes in v2: Replaced copy_from_user and kstrtoint (added in v1) with
kstrtouint_from_user
drivers/staging/wilc1000/wilc_debugfs.c | 24 ++++++++----------------
1 file changed, 8 insertions(+), 16 deletions(-)
diff --git a/drivers/staging/wilc1000/wilc_debugfs.c b/drivers/staging/wilc1000/wilc_debugfs.c
index be2e901..ae11186 100644
--- a/drivers/staging/wilc1000/wilc_debugfs.c
+++ b/drivers/staging/wilc1000/wilc_debugfs.c
@@ -48,28 +48,19 @@ static ssize_t wilc_debug_level_read(struct file *file, char __user *userbuf, si
return simple_read_from_buffer(userbuf, count, ppos, buf, res);
}
-static ssize_t wilc_debug_level_write(struct file *filp, const char *buf, size_t count, loff_t *ppos)
+static ssize_t wilc_debug_level_write(struct file *filp, const char __user *buf,
+ size_t count, loff_t *ppos)
{
- char buffer[128] = {};
int flag = 0;
+ int ret;
- if (count > sizeof(buffer))
- return -EINVAL;
-
- if (copy_from_user(buffer, buf, count)) {
- return -EFAULT;
- }
-
- flag = buffer[0] - '0';
-
- if (flag > 0)
- flag = DEBUG | ERR;
- else if (flag < 0)
- flag = 100;
+ ret = kstrtouint_from_user(buf, count, 16, &flag);
+ if (ret)
+ return ret;
if (flag > DBG_LEVEL_ALL) {
printk("%s, value (0x%08x) is out of range, stay previous flag (0x%08x)\n", __func__, flag, atomic_read(&DEBUG_LEVEL));
- return -EFAULT;
+ return -EINVAL;
}
atomic_set(&DEBUG_LEVEL, (int)flag);
@@ -78,6 +69,7 @@ static ssize_t wilc_debug_level_write(struct file *filp, const char *buf, size_t
printk("Debug-level disabled\n");
else
printk("Debug-level enabled\n");
+
return count;
}
--
2.5.0
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