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authorSean Young <sean@mess.org>2017-09-02 14:42:42 +0300
committerMauro Carvalho Chehab <mchehab@s-opensource.com>2017-09-23 14:21:33 +0300
commitb4756707152700c96acdfe149cb1ca4cec306c7a (patch)
treed27dcc1471d94d40791492f2ad88f7875ee2d3c4 /drivers/media/tuners
parent1efdf1776e2253b77413c997bed862410e4b6aaf (diff)
downloadlinux-b4756707152700c96acdfe149cb1ca4cec306c7a.tar.xz
media: dvb: i2c transfers over usb cannot be done from stack
Since commit 29d2fef8be11 ("usb: catch attempts to submit urbs with a vmalloc'd transfer buffer"), the AverMedia AverTV DVB-T USB 2.0 (a800) fails to probe. Cc: stable@vger.kernel.org Signed-off-by: Sean Young <sean@mess.org> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Diffstat (limited to 'drivers/media/tuners')
-rw-r--r--drivers/media/tuners/mt2060.c59
1 files changed, 47 insertions, 12 deletions
diff --git a/drivers/media/tuners/mt2060.c b/drivers/media/tuners/mt2060.c
index 2e487f9a2cc3..4983eeb39f36 100644
--- a/drivers/media/tuners/mt2060.c
+++ b/drivers/media/tuners/mt2060.c
@@ -38,41 +38,74 @@ MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off).");
static int mt2060_readreg(struct mt2060_priv *priv, u8 reg, u8 *val)
{
struct i2c_msg msg[2] = {
- { .addr = priv->cfg->i2c_address, .flags = 0, .buf = &reg, .len = 1 },
- { .addr = priv->cfg->i2c_address, .flags = I2C_M_RD, .buf = val, .len = 1 },
+ { .addr = priv->cfg->i2c_address, .flags = 0, .len = 1 },
+ { .addr = priv->cfg->i2c_address, .flags = I2C_M_RD, .len = 1 },
};
+ int rc = 0;
+ u8 *b;
+
+ b = kmalloc(2, GFP_KERNEL);
+ if (!b)
+ return -ENOMEM;
+
+ b[0] = reg;
+ b[1] = 0;
+
+ msg[0].buf = b;
+ msg[1].buf = b + 1;
if (i2c_transfer(priv->i2c, msg, 2) != 2) {
printk(KERN_WARNING "mt2060 I2C read failed\n");
- return -EREMOTEIO;
+ rc = -EREMOTEIO;
}
- return 0;
+ *val = b[1];
+ kfree(b);
+
+ return rc;
}
// Writes a single register
static int mt2060_writereg(struct mt2060_priv *priv, u8 reg, u8 val)
{
- u8 buf[2] = { reg, val };
struct i2c_msg msg = {
- .addr = priv->cfg->i2c_address, .flags = 0, .buf = buf, .len = 2
+ .addr = priv->cfg->i2c_address, .flags = 0, .len = 2
};
+ u8 *buf;
+ int rc = 0;
+
+ buf = kmalloc(2, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ buf[0] = reg;
+ buf[1] = val;
+
+ msg.buf = buf;
if (i2c_transfer(priv->i2c, &msg, 1) != 1) {
printk(KERN_WARNING "mt2060 I2C write failed\n");
- return -EREMOTEIO;
+ rc = -EREMOTEIO;
}
- return 0;
+ kfree(buf);
+ return rc;
}
// Writes a set of consecutive registers
static int mt2060_writeregs(struct mt2060_priv *priv,u8 *buf, u8 len)
{
int rem, val_len;
- u8 xfer_buf[16];
+ u8 *xfer_buf;
+ int rc = 0;
struct i2c_msg msg = {
- .addr = priv->cfg->i2c_address, .flags = 0, .buf = xfer_buf
+ .addr = priv->cfg->i2c_address, .flags = 0
};
+ xfer_buf = kmalloc(16, GFP_KERNEL);
+ if (!xfer_buf)
+ return -ENOMEM;
+
+ msg.buf = xfer_buf;
+
for (rem = len - 1; rem > 0; rem -= priv->i2c_max_regs) {
val_len = min_t(int, rem, priv->i2c_max_regs);
msg.len = 1 + val_len;
@@ -81,11 +114,13 @@ static int mt2060_writeregs(struct mt2060_priv *priv,u8 *buf, u8 len)
if (i2c_transfer(priv->i2c, &msg, 1) != 1) {
printk(KERN_WARNING "mt2060 I2C write failed (len=%i)\n", val_len);
- return -EREMOTEIO;
+ rc = -EREMOTEIO;
+ break;
}
}
- return 0;
+ kfree(xfer_buf);
+ return rc;
}
// Initialisation sequences