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drivers:misc: ti-st: fix hci-ll on wake_ind collision

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Where file-transfer stops/pauses in between, is
result of a HCI-LL anamoly in ST LL driver.
ST LL did not copy the contents of WaitQ into the TxQ, when a WAKEUP_IND
collision happened.
Make also sure, that the copying mechanism is safe, by wrapping it around
spin locks inside st_int_recv().
This was easily reproduced when the sleep timeout was reduced to 100ms
for HCI-LL.

Signed-off-by: Pavan Savoy <pavan_savoy@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Pavan Savoy 2011-02-04 02:23:14 -06:00 committed by Greg Kroah-Hartman
parent ef04d121f0
commit 6d71ba2105
1 changed files with 15 additions and 0 deletions
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15
drivers/misc/ti-st/st_core.c
View file

@ -236,6 +236,7 @@ void st_int_recv(void *disc_data,
int len = 0, type = 0;
unsigned char *plen;
struct st_data_s *st_gdata = (struct st_data_s *)disc_data;
unsigned long flags;
ptr = (char *)data;
/* tty_receive sent null ? */
@ -248,6 +249,7 @@ void st_int_recv(void *disc_data,
"rx_count %ld", count, st_gdata->rx_state,
st_gdata->rx_count);
spin_lock_irqsave(&st_gdata->lock, flags);
/* Decode received bytes here */
while (count) {
if (st_gdata->rx_count) {
@ -308,13 +310,25 @@ void st_int_recv(void *disc_data,
* sleep state received --
*/
st_ll_sleep_state(st_gdata, *ptr);
/* if WAKEUP_IND collides copy from waitq to txq
* and assume chip awake
*/
spin_unlock_irqrestore(&st_gdata->lock, flags);
if (st_ll_getstate(st_gdata) == ST_LL_AWAKE)
st_wakeup_ack(st_gdata, LL_WAKE_UP_ACK);
spin_lock_irqsave(&st_gdata->lock, flags);
ptr++;
count--;
continue;
case LL_WAKE_UP_ACK:
pr_debug("PM packet");
spin_unlock_irqrestore(&st_gdata->lock, flags);
/* wake up ack received */
st_wakeup_ack(st_gdata, *ptr);
spin_lock_irqsave(&st_gdata->lock, flags);
ptr++;
count--;
continue;
@ -337,6 +351,7 @@ void st_int_recv(void *disc_data,
ptr++;
count--;
}
spin_unlock_irqrestore(&st_gdata->lock, flags);
pr_debug("done %s", __func__);
return;
}