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NFC: pn533: use constant off-stack buffer for sending acks

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fix for WARN:

usb 3-2.4.1: NFC: Exchanging data failed (error 0x13)
llcp: nfc_llcp_recv: err -5
llcp: nfc_llcp_symm_timer: SYMM timeout
------------[ cut here ]------------
WARNING: CPU: 1 PID: 26397 at .../drivers/usb/core/hcd.c:1584 usb_hcd_map_urb_for_dma+0x370/0x550
transfer buffer not dma capable
[...]
Workqueue: events nfc_llcp_timeout_work [nfc]
Call Trace:
 ? dump_stack+0x46/0x5a
 ? __warn+0xb9/0xe0
 ? warn_slowpath_fmt+0x5a/0x80
 ? usb_hcd_map_urb_for_dma+0x370/0x550
 ? usb_hcd_submit_urb+0x2fb/0xa60
 ? dequeue_entity+0x3f2/0xc30
 ? pn533_usb_send_ack+0x5d/0x80 [pn533_usb]
 ? pn533_usb_abort_cmd+0x13/0x20 [pn533_usb]
 ? pn533_dep_link_down+0x32/0x70 [pn533]
 ? nfc_dep_link_down+0x87/0xd0 [nfc]
[...]
usb 3-2.4.1: NFC: Exchanging data failed (error 0x13)
llcp: nfc_llcp_recv: err -5
llcp: nfc_llcp_symm_timer: SYMM timeout

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Michał Mirosław 2017-04-06 05:49:02 +02:00 committed by Samuel Ortiz
parent 49d22c70aa
commit 8b55d7581f
2 changed files with 3 additions and 3 deletions
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2
drivers/nfc/pn533/i2c.c
View File

@ -51,7 +51,7 @@ static int pn533_i2c_send_ack(struct pn533 *dev, gfp_t flags)
{
struct pn533_i2c_phy *phy = dev->phy;
struct i2c_client *client = phy->i2c_dev;
u8 ack[6] = {0x00, 0x00, 0xff, 0x00, 0xff, 0x00};
static const u8 ack[6] = {0x00, 0x00, 0xff, 0x00, 0xff, 0x00};
/* spec 6.2.1.3: Preamble, SoPC (2), ACK Code (2), Postamble */
int rc;

4
drivers/nfc/pn533/usb.c
View File

@ -148,11 +148,11 @@ static int pn533_submit_urb_for_ack(struct pn533_usb_phy *phy, gfp_t flags)
static int pn533_usb_send_ack(struct pn533 *dev, gfp_t flags)
{
struct pn533_usb_phy *phy = dev->phy;
u8 ack[6] = {0x00, 0x00, 0xff, 0x00, 0xff, 0x00};
static const u8 ack[6] = {0x00, 0x00, 0xff, 0x00, 0xff, 0x00};
/* spec 7.1.1.3: Preamble, SoPC (2), ACK Code (2), Postamble */
int rc;
phy->out_urb->transfer_buffer = ack;
phy->out_urb->transfer_buffer = (u8 *)ack;
phy->out_urb->transfer_buffer_length = sizeof(ack);
rc = usb_submit_urb(phy->out_urb, flags);