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authorPavan Savoy <pavan_savoy@ti.com>2011-02-04 11:23:14 +0300
committerGreg Kroah-Hartman <gregkh@suse.de>2011-02-04 23:41:21 +0300
commit6d71ba2105a1d8c1712cdfcf46fc6040e4707cb9 (patch)
tree193b01abd397a5ebf5bcbdb6a02e51f8757582a2
parentef04d121f030329aae0c2d3ec22beea0c5cbcfd3 (diff)
downloadlinux-6d71ba2105a1d8c1712cdfcf46fc6040e4707cb9.tar.xz
drivers:misc: ti-st: fix hci-ll on wake_ind collision
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>
-rw-r--r--drivers/misc/ti-st/st_core.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/misc/ti-st/st_core.c b/drivers/misc/ti-st/st_core.c
index dd2c879faff6..f0d24d852078 100644
--- a/drivers/misc/ti-st/st_core.c
+++ b/drivers/misc/ti-st/st_core.c
@@ -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;
}