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authorDoug Anderson <dianders@chromium.org>2014-04-30 10:44:05 -0700
committerLee Jones <lee.jones@linaro.org>2014-06-03 08:11:46 +0100
commit362196e5d0832ce3c4e1df376c02cff812a2391b (patch)
tree3ef8f401d423fe0011e1bdfe573fea914feded82 /drivers/mfd
parent1fe368665b1499041919d78467147849989af7c9 (diff)
downloadlinux-362196e5d0832ce3c4e1df376c02cff812a2391b.tar.bz2
mfd: cros_ec: spi: Add mutex to cros_ec_spi
The main transfer function for cros_ec_spi can be called by more than one client at a time. Make sure that those clients don't stomp on each other by locking the bus for the duration of the transfer function. Signed-off-by: Doug Anderson <dianders@chromium.org> Reviewed-by: Simon Glass <sjg@chromium.org> Tested-by: Andrew Bresticker <abrestic@chromium.org> Tested-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Lee Jones <lee.jones@linaro.org>
Diffstat (limited to 'drivers/mfd')
-rw-r--r--drivers/mfd/cros_ec_spi.c26
1 files changed, 21 insertions, 5 deletions
diff --git a/drivers/mfd/cros_ec_spi.c b/drivers/mfd/cros_ec_spi.c
index c185eb67943f..a2a605de79a7 100644
--- a/drivers/mfd/cros_ec_spi.c
+++ b/drivers/mfd/cros_ec_spi.c
@@ -65,11 +65,13 @@
* if no record
* @end_of_msg_delay: used to set the delay_usecs on the spi_transfer that
* is sent when we want to turn off CS at the end of a transaction.
+ * @lock: mutex to ensure only one user of cros_ec_command_spi_xfer at a time
*/
struct cros_ec_spi {
struct spi_device *spi;
s64 last_transfer_ns;
unsigned int end_of_msg_delay;
+ struct mutex lock;
};
static void debug_packet(struct device *dev, const char *name, u8 *ptr,
@@ -208,6 +210,13 @@ static int cros_ec_command_spi_xfer(struct cros_ec_device *ec_dev,
int ret = 0, final_ret;
struct timespec ts;
+ /*
+ * We have the shared ec_dev buffer plus we do lots of separate spi_sync
+ * calls, so we need to make sure only one person is using this at a
+ * time.
+ */
+ mutex_lock(&ec_spi->lock);
+
len = cros_ec_prepare_tx(ec_dev, ec_msg);
dev_dbg(ec_dev->dev, "prepared, len=%d\n", len);
@@ -260,7 +269,7 @@ static int cros_ec_command_spi_xfer(struct cros_ec_device *ec_dev,
ret = final_ret;
if (ret < 0) {
dev_err(ec_dev->dev, "spi transfer failed: %d\n", ret);
- return ret;
+ goto exit;
}
/* check response error code */
@@ -269,14 +278,16 @@ static int cros_ec_command_spi_xfer(struct cros_ec_device *ec_dev,
dev_warn(ec_dev->dev, "command 0x%02x returned an error %d\n",
ec_msg->cmd, ptr[0]);
debug_packet(ec_dev->dev, "in_err", ptr, len);
- return -EINVAL;
+ ret = -EINVAL;
+ goto exit;
}
len = ptr[1];
sum = ptr[0] + ptr[1];
if (len > ec_msg->in_len) {
dev_err(ec_dev->dev, "packet too long (%d bytes, expected %d)",
len, ec_msg->in_len);
- return -ENOSPC;
+ ret = -ENOSPC;
+ goto exit;
}
/* copy response packet payload and compute checksum */
@@ -293,10 +304,14 @@ static int cros_ec_command_spi_xfer(struct cros_ec_device *ec_dev,
dev_err(ec_dev->dev,
"bad packet checksum, expected %02x, got %02x\n",
sum, ptr[len + 2]);
- return -EBADMSG;
+ ret = -EBADMSG;
+ goto exit;
}
- return 0;
+ ret = 0;
+exit:
+ mutex_unlock(&ec_spi->lock);
+ return ret;
}
static void cros_ec_spi_dt_probe(struct cros_ec_spi *ec_spi, struct device *dev)
@@ -327,6 +342,7 @@ static int cros_ec_spi_probe(struct spi_device *spi)
if (ec_spi == NULL)
return -ENOMEM;
ec_spi->spi = spi;
+ mutex_init(&ec_spi->lock);
ec_dev = devm_kzalloc(dev, sizeof(*ec_dev), GFP_KERNEL);
if (!ec_dev)
return -ENOMEM;