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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>
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ef04d121f0
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1 changed files with 15 additions and 0 deletions
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@ -236,6 +236,7 @@ void st_int_recv(void *disc_data,
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int len = 0, type = 0;
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unsigned char *plen;
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struct st_data_s *st_gdata = (struct st_data_s *)disc_data;
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unsigned long flags;
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ptr = (char *)data;
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/* tty_receive sent null ? */
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@ -248,6 +249,7 @@ void st_int_recv(void *disc_data,
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"rx_count %ld", count, st_gdata->rx_state,
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st_gdata->rx_count);
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spin_lock_irqsave(&st_gdata->lock, flags);
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/* Decode received bytes here */
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while (count) {
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if (st_gdata->rx_count) {
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@ -308,13 +310,25 @@ void st_int_recv(void *disc_data,
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* sleep state received --
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*/
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st_ll_sleep_state(st_gdata, *ptr);
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/* if WAKEUP_IND collides copy from waitq to txq
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* and assume chip awake
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*/
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spin_unlock_irqrestore(&st_gdata->lock, flags);
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if (st_ll_getstate(st_gdata) == ST_LL_AWAKE)
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st_wakeup_ack(st_gdata, LL_WAKE_UP_ACK);
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spin_lock_irqsave(&st_gdata->lock, flags);
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ptr++;
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count--;
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continue;
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case LL_WAKE_UP_ACK:
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pr_debug("PM packet");
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spin_unlock_irqrestore(&st_gdata->lock, flags);
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/* wake up ack received */
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st_wakeup_ack(st_gdata, *ptr);
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spin_lock_irqsave(&st_gdata->lock, flags);
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ptr++;
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count--;
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continue;
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@ -337,6 +351,7 @@ void st_int_recv(void *disc_data,
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ptr++;
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count--;
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}
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spin_unlock_irqrestore(&st_gdata->lock, flags);
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pr_debug("done %s", __func__);
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return;
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}
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