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| author | Pavan Savoy <pavan_savoy@ti.com> | 2011-02-04 02:23:14 -0600 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-02-04 12:41:21 -0800 |
| commit | 6d71ba2105a1d8c1712cdfcf46fc6040e4707cb9 (patch) | |
| tree | 193b01abd397a5ebf5bcbdb6a02e51f8757582a2 /drivers/misc | |
| parent | ef04d121f030329aae0c2d3ec22beea0c5cbcfd3 (diff) | |
| download | lwn-6d71ba2105a1d8c1712cdfcf46fc6040e4707cb9.tar.gz lwn-6d71ba2105a1d8c1712cdfcf46fc6040e4707cb9.zip | |
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>
Diffstat (limited to 'drivers/misc')
| -rw-r--r-- | 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 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; } |