Applied "spi: fsl-espi: factor out initial message checking" to the spi tree

Commit Message

Mark Brown Sept. 12, 2016, 7:07 p.m. UTC

The patch

   spi: fsl-espi: factor out initial message checking

has been applied to the spi tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

From d3152cf1c8cf3f75d8eb82ae399ea4b35a0df8d4 Mon Sep 17 00:00:00 2001
From: Heiner Kallweit <[e-mail]>
Date: Wed, 7 Sep 2016 22:53:38 +0200
Subject: [PATCH] spi: fsl-espi: factor out initial message checking

Checking the message is currently done at diffrent places in the
driver. Factor it out to fsl_espi_check_message.

Signed-off-by: Heiner Kallweit <[e-mail]>
Signed-off-by: Mark Brown <[e-mail]>
---
 drivers/spi/spi-fsl-espi.c | 43 +++++++++++++++++++++++++++++--------------
 1 file changed, 29 insertions(+), 14 deletions(-)

Patch

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 190ca5ccf834..2bfaff64beb8 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -98,6 +98,30 @@  static unsigned int fsl_espi_copy_to_buf(struct spi_message *m,
 	return tx_only;
 }
 
+static int fsl_espi_check_message(struct spi_message *m)
+{
+	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
+	struct spi_transfer *t, *first;
+
+	if (m->frame_length > SPCOM_TRANLEN_MAX) {
+		dev_err(mspi->dev, "message too long, size is %u bytes\n",
+			m->frame_length);
+		return -EMSGSIZE;
+	}
+
+	first = list_first_entry(&m->transfers, struct spi_transfer,
+				 transfer_list);
+	list_for_each_entry(t, &m->transfers, transfer_list) {
+		if (first->bits_per_word != t->bits_per_word ||
+		    first->speed_hz != t->speed_hz) {
+			dev_err(mspi->dev, "bits_per_word/speed_hz should be the same for all transfers\n");
+			return -EINVAL;
+		}
+	}
+
+	return 0;
+}
+
 static void fsl_espi_change_mode(struct spi_device *spi)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master);
@@ -222,11 +246,6 @@  static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
 	reinit_completion(&mpc8xxx_spi->done);
 
 	/* Set SPCOM[CS] and SPCOM[TRANLEN] field */
-	if (t->len > SPCOM_TRANLEN_MAX) {
-		dev_err(mpc8xxx_spi->dev, "Transaction length (%d)"
-				" beyond the SPCOM[TRANLEN] field\n", t->len);
-		return -EINVAL;
-	}
 	mpc8xxx_spi_write_reg(&reg_base->command,
 		(SPCOM_CS(spi->chip_select) | SPCOM_TRANLEN(t->len - 1)));
 
@@ -253,20 +272,12 @@  static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
 static int fsl_espi_do_trans(struct spi_message *m, struct spi_transfer *trans)
 {
 	struct spi_device *spi = m->spi;
-	struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master);
 	struct spi_transfer *t, *first;
 	int ret = 0;
 
 	first = list_first_entry(&m->transfers, struct spi_transfer,
 			transfer_list);
 	list_for_each_entry(t, &m->transfers, transfer_list) {
-		if ((first->bits_per_word != t->bits_per_word) ||
-			(first->speed_hz != t->speed_hz)) {
-			dev_err(mspi->dev,
-				"bits_per_word/speed_hz should be same for the same SPI transfer\n");
-			return -EINVAL;
-		}
-
 		trans->speed_hz = t->speed_hz;
 		trans->bits_per_word = t->bits_per_word;
 		trans->delay_usecs = max(first->delay_usecs, t->delay_usecs);
@@ -313,6 +324,10 @@  static int fsl_espi_do_one_msg(struct spi_master *master,
 	struct spi_transfer *t, trans = {};
 	int ret;
 
+	ret = fsl_espi_check_message(m);
+	if (ret)
+		goto out;
+
 	list_for_each_entry(t, &m->transfers, transfer_list) {
 		if (t->rx_buf)
 			rx_buf = t->rx_buf;
@@ -325,7 +340,7 @@  static int fsl_espi_do_one_msg(struct spi_master *master,
 	ret = fsl_espi_trans(m, &trans, rx_buf);
 
 	m->actual_length = ret ? 0 : trans.len;
-
+out:
 	if (m->status == -EINPROGRESS)
 		m->status = ret;