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authorDuncan Sands <duncan.sands@math.u-psud.fr>2005-06-23 09:37:56 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2005-07-12 11:52:55 -0700
commit1a7aad15ff93be104c8e0851a43b94f8ccd92225 (patch)
tree943d64e19c20871b20637e4e51dfdb950e28cad0
parentcd5c08fb7b0d960b7cd48bc977feee7b3bd8b046 (diff)
[PATCH] USB ATM: fix line resync logic
We map states 0x00 and 0x10 to the ATM_PHY_SIG_LOST flag. The current logic fails to resync the line if we get state 0x10 followed by 0x00, since we only resync the line when the state is 0x00 and the flag changed. Doubly fixed by (1) always resyncing the line when the state is 0x00 even if the state didn't change, and (2) keeping track of the last state, not just the flag. We do (2) as well as (1) in order to get better log messages. This is a tweaked version of the original patch by Aurelio Arroyo. Signed-off-by: Duncan Sands <baldrick@free.fr> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--drivers/usb/atm/speedtch.c55
1 files changed, 28 insertions, 27 deletions
diff --git a/drivers/usb/atm/speedtch.c b/drivers/usb/atm/speedtch.c
index 03a0e99a4267..d0cbbb7f0385 100644
--- a/drivers/usb/atm/speedtch.c
+++ b/drivers/usb/atm/speedtch.c
@@ -100,6 +100,8 @@ struct speedtch_instance_data {
struct work_struct status_checker;
+ unsigned char last_status;
+
int poll_delay; /* milliseconds */
struct timer_list resubmit_timer;
@@ -423,7 +425,8 @@ static void speedtch_check_status(struct speedtch_instance_data *instance)
struct usbatm_data *usbatm = instance->usbatm;
struct atm_dev *atm_dev = usbatm->atm_dev;
unsigned char *buf = instance->scratch_buffer;
- int ret;
+ int down_speed, up_speed, ret;
+ unsigned char status;
atm_dbg(usbatm, "%s entered\n", __func__);
@@ -436,37 +439,34 @@ static void speedtch_check_status(struct speedtch_instance_data *instance)
instance->poll_delay = max(instance->poll_delay / 2, MIN_POLL_DELAY);
- atm_dbg(usbatm, "%s: line state %02x\n", __func__, buf[OFFSET_7]);
+ status = buf[OFFSET_7];
- switch (buf[OFFSET_7]) {
- case 0:
- if (atm_dev->signal != ATM_PHY_SIG_LOST) {
+ atm_dbg(usbatm, "%s: line state %02x\n", __func__, status);
+
+ if ((status != instance->last_status) || !status) {
+ switch (status) {
+ case 0:
atm_dev->signal = ATM_PHY_SIG_LOST;
- atm_info(usbatm, "ADSL line is down\n");
- /* It'll never resync again unless we ask it to... */
+ if (instance->last_status)
+ atm_info(usbatm, "ADSL line is down\n");
+ /* It may never resync again unless we ask it to... */
ret = speedtch_start_synchro(instance);
- }
- break;
+ break;
- case 0x08:
- if (atm_dev->signal != ATM_PHY_SIG_UNKNOWN) {
+ case 0x08:
atm_dev->signal = ATM_PHY_SIG_UNKNOWN;
atm_info(usbatm, "ADSL line is blocked?\n");
- }
- break;
+ break;
- case 0x10:
- if (atm_dev->signal != ATM_PHY_SIG_LOST) {
+ case 0x10:
atm_dev->signal = ATM_PHY_SIG_LOST;
atm_info(usbatm, "ADSL line is synchronising\n");
- }
- break;
+ break;
- case 0x20:
- if (atm_dev->signal != ATM_PHY_SIG_FOUND) {
- int down_speed = buf[OFFSET_b] | (buf[OFFSET_b + 1] << 8)
+ case 0x20:
+ down_speed = buf[OFFSET_b] | (buf[OFFSET_b + 1] << 8)
| (buf[OFFSET_b + 2] << 16) | (buf[OFFSET_b + 3] << 24);
- int up_speed = buf[OFFSET_b + 4] | (buf[OFFSET_b + 5] << 8)
+ up_speed = buf[OFFSET_b + 4] | (buf[OFFSET_b + 5] << 8)
| (buf[OFFSET_b + 6] << 16) | (buf[OFFSET_b + 7] << 24);
if (!(down_speed & 0x0000ffff) && !(up_speed & 0x0000ffff)) {
@@ -480,15 +480,15 @@ static void speedtch_check_status(struct speedtch_instance_data *instance)
atm_info(usbatm,
"ADSL line is up (%d kb/s down | %d kb/s up)\n",
down_speed, up_speed);
- }
- break;
+ break;
- default:
- if (atm_dev->signal != ATM_PHY_SIG_UNKNOWN) {
+ default:
atm_dev->signal = ATM_PHY_SIG_UNKNOWN;
- atm_info(usbatm, "Unknown line state %02x\n", buf[OFFSET_7]);
+ atm_info(usbatm, "Unknown line state %02x\n", status);
+ break;
}
- break;
+
+ instance->last_status = status;
}
}
@@ -728,6 +728,7 @@ static int speedtch_bind(struct usbatm_data *usbatm,
instance->status_checker.timer.function = speedtch_status_poll;
instance->status_checker.timer.data = (unsigned long)instance;
+ instance->last_status = 0xff;
instance->poll_delay = MIN_POLL_DELAY;
init_timer(&instance->resubmit_timer);