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Date: Tue, 8 Nov 2011 16:43:45 +0000
From: Andrew Vincer <Andrew.Vincer@...rat.co.uk>
To: unlisted-recipients:; (no To-header on input)
CC: "mchehab@...radead.org" <mchehab@...radead.org>,
"jarod@...hat.com" <jarod@...hat.com>,
"error27@...il.com" <error27@...il.com>,
"linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/1] rc: Fix input deadlock and transmit error in redrat3
driver
Fixed submit urb logic so hardware doesn't hang trying to transmit
signal data
Removed unneeded enable/disable detector commands in
redrat3_transmit_ir (the hardware does this anyway) and converted
arguments to unsigned as per 5588dc2
Signed-off-by: Andrew Vincer <andrew@...rat.co.uk>
---
drivers/media/rc/redrat3.c | 52 +++++++++++++++----------------------------
1 files changed, 18 insertions(+), 34 deletions(-)
diff --git a/drivers/media/rc/redrat3.c b/drivers/media/rc/redrat3.c
index 61287fc..9bff23c 100644
--- a/drivers/media/rc/redrat3.c
+++ b/drivers/media/rc/redrat3.c
@@ -286,12 +286,6 @@ static void redrat3_issue_async(struct redrat3_dev *rr3)
rr3_ftr(rr3->dev, "Entering %s\n", __func__);
- if (!rr3->det_enabled) {
- dev_warn(rr3->dev, "not issuing async read, "
- "detector not enabled\n");
- return;
- }
-
memset(rr3->bulk_in_buf, 0, rr3->ep_in->wMaxPacketSize);
res = usb_submit_urb(rr3->read_urb, GFP_ATOMIC);
if (res)
@@ -827,6 +821,7 @@ out:
static void redrat3_handle_async(struct urb *urb, struct pt_regs *regs)
{
struct redrat3_dev *rr3;
+ int ret;
if (!urb)
return;
@@ -840,15 +835,13 @@ static void redrat3_handle_async(struct urb *urb, struct pt_regs *regs)
rr3_ftr(rr3->dev, "Entering %s\n", __func__);
- if (!rr3->det_enabled) {
- rr3_dbg(rr3->dev, "received a read callback but detector "
- "disabled - ignoring\n");
- return;
- }
-
switch (urb->status) {
case 0:
- redrat3_get_ir_data(rr3, urb->actual_length);
+ ret = redrat3_get_ir_data(rr3, urb->actual_length);
+ if (!ret) {
+ /* no error, prepare to read more */
+ redrat3_issue_async(rr3);
+ }
break;
case -ECONNRESET:
@@ -865,11 +858,6 @@ static void redrat3_handle_async(struct urb *urb, struct pt_regs *regs)
rr3->pkttype = 0;
break;
}
-
- if (!rr3->transmitting)
- redrat3_issue_async(rr3);
- else
- rr3_dbg(rr3->dev, "IR transmit in progress\n");
}
static void redrat3_write_bulk_callback(struct urb *urb, struct pt_regs *regs)
@@ -896,21 +884,24 @@ static u16 mod_freq_to_val(unsigned int mod_freq)
return (u16)(65536 - (mult / mod_freq));
}
-static int redrat3_set_tx_carrier(struct rc_dev *dev, u32 carrier)
+static int redrat3_set_tx_carrier(struct rc_dev *rcdev, u32 carrier)
{
- struct redrat3_dev *rr3 = dev->priv;
+ struct redrat3_dev *rr3 = rcdev->priv;
+ struct device *dev = rr3->dev;
+ rr3_dbg(dev, "Setting modulation frequency to %u", carrier);
rr3->carrier = carrier;
return carrier;
}
-static int redrat3_transmit_ir(struct rc_dev *rcdev, int *txbuf, u32 n)
+static int redrat3_transmit_ir(struct rc_dev *rcdev, unsigned *txbuf,
+ unsigned count)
{
struct redrat3_dev *rr3 = rcdev->priv;
struct device *dev = rr3->dev;
struct redrat3_signal_header header;
- int i, j, count, ret, ret_len, offset;
+ int i, j, ret, ret_len, offset;
int lencheck, cur_sample_len, pipe;
char *buffer = NULL, *sigdata = NULL;
int *sample_lens = NULL;
@@ -928,20 +919,13 @@ static int redrat3_transmit_ir(struct rc_dev *rcdev, int *txbuf, u32 n)
return -EAGAIN;
}
- count = n / sizeof(int);
if (count > (RR3_DRIVER_MAXLENS * 2))
return -EINVAL;
+ /* rr3 will disable rc detector on transmit */
+ rr3->det_enabled = false;
rr3->transmitting = true;
- redrat3_disable_detector(rr3);
-
- if (rr3->det_enabled) {
- dev_err(dev, "%s: cannot tx while rx is enabled\n", __func__);
- ret = -EIO;
- goto out;
- }
-
sample_lens = kzalloc(sizeof(int) * RR3_DRIVER_MAXLENS, GFP_KERNEL);
if (!sample_lens) {
ret = -ENOMEM;
@@ -1055,7 +1039,7 @@ static int redrat3_transmit_ir(struct rc_dev *rcdev, int *txbuf, u32 n)
if (ret < 0)
dev_err(dev, "Error: control msg send failed, rc %d\n", ret);
else
- ret = n;
+ ret = count;
out:
kfree(sample_lens);
@@ -1063,8 +1047,8 @@ out:
kfree(sigdata);
rr3->transmitting = false;
-
- redrat3_enable_detector(rr3);
+ /* rr3 re-enables rc detector because it was enabled before */
+ rr3->det_enabled = true;
return ret;
}
--
1.7.1
--
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