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Subject[PATCH 26/50] drivers:misc: ti-st: fix hci-ll on wake_ind collision
Date
From: Pavan Savoy <pavan_savoy@ti.com>

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>
---
drivers/misc/ti-st/st_core.c | 15 +++++++++++++++
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 dd2c879..f0d24d8 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;
}
--
1.7.4.1


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