ath5k: Read and write the TSF via debugfs

This patch updates the ath5k specific entry in the debugfs to read and reset the TSF value, to allowing write it, too. This makes debugging the IBSS handling of wifi drivers _much_ easier.

Signed-off-by: Alina Friedrichsen <x-alina@gmx.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 9 insertions, 2 deletions

diff --git a/drivers/net/wireless/ath5k/debug.c b/drivers/net/wireless/ath5k/debug.c
index d281b6e38629..129b72684daf 100644
--- a/drivers/net/wireless/ath5k/debug.c
+++ b/drivers/net/wireless/ath5k/debug.c
@@ -210,15 +210,22 @@ static ssize_t write_file_tsf(struct file *file,
                                  size_t count, loff_t *ppos)
 {
         struct ath5k_softc *sc = file->private_data;
-        char buf[20];
+        char buf[21];
+        unsigned long long tsf;
 
-        if (copy_from_user(buf, userbuf, min(count, sizeof(buf))))
+        if (copy_from_user(buf, userbuf, min(count, sizeof(buf) - 1)))
                 return -EFAULT;
+        buf[sizeof(buf) - 1] = '\0';
 
         if (strncmp(buf, "reset", 5) == 0) {
                 ath5k_hw_reset_tsf(sc->ah);
                 printk(KERN_INFO "debugfs reset TSF\n");
+        } else {
+                tsf = simple_strtoul(buf, NULL, 0);
+                ath5k_hw_set_tsf64(sc->ah, tsf);
+                printk(KERN_INFO "debugfs set TSF to %#018llx\n", tsf);
         }
+
         return count;
 }