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authorVijay Badawadagi <bvijay@ti.com>2011-08-10 11:18:33 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2011-08-22 17:13:33 -0400
commit78bb9697e2c4b62c426f1a2571c293a2e4463adf (patch)
treea760fc3b3b4b39ce808434f97fea864c9346c1b4 /drivers/misc/ti-st
parent74a4fcf19eed6550651f455db5741fd216b4f004 (diff)
drivers:misc: ti-st: fail-safe on wrong pkt type
Texas Instrument's shared transport driver interpret incoming data from the UART based on the various protocol drivers registered to the driver such as btwilink driver or FM or GPS driver which provide logical channel IDs. In case of bad-behavior from chip such as HCI Event response for a GPS command or a HCI Event (h/w error event) for a FM response & In case of bad-behavior from UART driver such as dropping data bytes a fail-safe is required to avoid kernel panic. Signed-off-by: Pavan Savoy <pavan_savoy@ti.com> Signed-off-by: Vijay Badawadagi <bvijay@ti.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/misc/ti-st')
-rw-r--r--drivers/misc/ti-st/st_core.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/misc/ti-st/st_core.c b/drivers/misc/ti-st/st_core.c
index c8e335db3451..1f973ce3043f 100644
--- a/drivers/misc/ti-st/st_core.c
+++ b/drivers/misc/ti-st/st_core.c
@@ -338,6 +338,12 @@ void st_int_recv(void *disc_data,
338 /* Unknow packet? */ 338 /* Unknow packet? */
339 default: 339 default:
340 type = *ptr; 340 type = *ptr;
341 if (st_gdata->list[type] == NULL) {
342 pr_err("chip/interface misbehavior dropping"
343 " frame starting with 0x%02x", type);
344 goto done;
345
346 }
341 st_gdata->rx_skb = alloc_skb( 347 st_gdata->rx_skb = alloc_skb(
342 st_gdata->list[type]->max_frame_size, 348 st_gdata->list[type]->max_frame_size,
343 GFP_ATOMIC); 349 GFP_ATOMIC);
@@ -354,6 +360,7 @@ void st_int_recv(void *disc_data,
354 ptr++; 360 ptr++;
355 count--; 361 count--;
356 } 362 }
363done:
357 spin_unlock_irqrestore(&st_gdata->lock, flags); 364 spin_unlock_irqrestore(&st_gdata->lock, flags);
358 pr_debug("done %s", __func__); 365 pr_debug("done %s", __func__);
359 return; 366 return;