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Date: Thu, 17 Sep 2009 19:47:49 -0400
From: Mike Frysinger <vapier@...too.org>
To: spi-devel-general@...ts.sourceforge.net,
David Brownell <dbrownell@...rs.sourceforge.net>
Cc: linux-kernel@...r.kernel.org,
uclinux-dist-devel@...ckfin.uclinux.org,
Daniel Mack <daniel@...aq.de>, Bryan Wu <cooloney@...nel.org>
Subject: [PATCH 1/5] Blackfin SPI: fix resources leakage
From: Daniel Mack <daniel@...aq.de>
Re-order setup() a bit so we don't leak memory/dma/gpio resources upon
errors.
Signed-off-by: Daniel Mack <daniel@...aq.de>
Signed-off-by: Bryan Wu <cooloney@...nel.org>
Signed-off-by: Mike Frysinger <vapier@...too.org>
---
drivers/spi/spi_bfin5xx.c | 99 +++++++++++++++++++++++++--------------------
1 files changed, 55 insertions(+), 44 deletions(-)
diff --git a/drivers/spi/spi_bfin5xx.c b/drivers/spi/spi_bfin5xx.c
index 73e24ef..8ec4969 100644
--- a/drivers/spi/spi_bfin5xx.c
+++ b/drivers/spi/spi_bfin5xx.c
@@ -1005,18 +1005,19 @@ static u16 ssel[][MAX_SPI_SSEL] = {
/* first setup for new devices */
static int bfin_spi_setup(struct spi_device *spi)
{
- struct bfin5xx_spi_chip *chip_info = NULL;
- struct chip_data *chip;
+ struct bfin5xx_spi_chip *chip_info;
+ struct chip_data *chip = NULL;
struct driver_data *drv_data = spi_master_get_devdata(spi->master);
- int ret;
+ int ret = -EINVAL;
if (spi->bits_per_word != 8 && spi->bits_per_word != 16)
- return -EINVAL;
+ goto error;
/* Only alloc (or use chip_info) on first setup */
+ chip_info = NULL;
chip = spi_get_ctldata(spi);
if (chip == NULL) {
- chip = kzalloc(sizeof(struct chip_data), GFP_KERNEL);
+ chip = kzalloc(sizeof(*chip), GFP_KERNEL);
if (!chip)
return -ENOMEM;
@@ -1035,7 +1036,7 @@ static int bfin_spi_setup(struct spi_device *spi)
if (chip_info->ctl_reg & (SPE|MSTR|CPOL|CPHA|LSBF|SIZE)) {
dev_err(&spi->dev, "do not set bits in ctl_reg "
"that the SPI framework manages\n");
- return -EINVAL;
+ goto error;
}
chip->enable_dma = chip_info->enable_dma != 0
@@ -1059,26 +1060,6 @@ static int bfin_spi_setup(struct spi_device *spi)
chip->ctl_reg |= MSTR;
/*
- * if any one SPI chip is registered and wants DMA, request the
- * DMA channel for it
- */
- if (chip->enable_dma && !drv_data->dma_requested) {
- /* register dma irq handler */
- if (request_dma(drv_data->dma_channel, "BFIN_SPI_DMA") < 0) {
- dev_dbg(&spi->dev,
- "Unable to request BlackFin SPI DMA channel\n");
- return -ENODEV;
- }
- if (set_dma_callback(drv_data->dma_channel,
- bfin_spi_dma_irq_handler, drv_data) < 0) {
- dev_dbg(&spi->dev, "Unable to set dma callback\n");
- return -EPERM;
- }
- dma_disable_irq(drv_data->dma_channel);
- drv_data->dma_requested = 1;
- }
-
- /*
* Notice: for blackfin, the speed_hz is the value of register
* SPI_BAUD, not the real baudrate
*/
@@ -1086,16 +1067,6 @@ static int bfin_spi_setup(struct spi_device *spi)
chip->flag = 1 << (spi->chip_select);
chip->chip_select_num = spi->chip_select;
- if (chip->chip_select_num == 0) {
- ret = gpio_request(chip->cs_gpio, spi->modalias);
- if (ret) {
- if (drv_data->dma_requested)
- free_dma(drv_data->dma_channel);
- return ret;
- }
- gpio_direction_output(chip->cs_gpio, 1);
- }
-
switch (chip->bits_per_word) {
case 8:
chip->n_bytes = 1;
@@ -1122,9 +1093,37 @@ static int bfin_spi_setup(struct spi_device *spi)
default:
dev_err(&spi->dev, "%d bits_per_word is not supported\n",
chip->bits_per_word);
- if (chip_info)
- kfree(chip);
- return -ENODEV;
+ goto error;
+ }
+
+ /*
+ * if any one SPI chip is registered and wants DMA, request the
+ * DMA channel for it
+ */
+ if (chip->enable_dma && !drv_data->dma_requested) {
+ /* register dma irq handler */
+ ret = request_dma(drv_data->dma_channel, "BFIN_SPI_DMA");
+ if (ret) {
+ dev_dbg(&spi->dev,
+ "Unable to request BlackFin SPI DMA channel\n");
+ goto error;
+ }
+ drv_data->dma_requested = 1;
+
+ ret = set_dma_callback(drv_data->dma_channel,
+ bfin_spi_dma_irq_handler, drv_data);
+ if (ret) {
+ dev_dbg(&spi->dev, "Unable to set dma callback\n");
+ goto error;
+ }
+ dma_disable_irq(drv_data->dma_channel);
+ }
+
+ if (chip->chip_select_num == 0) {
+ ret = gpio_request(chip->cs_gpio, spi->modalias);
+ if (ret)
+ goto error;
+ gpio_direction_output(chip->cs_gpio, 1);
}
dev_dbg(&spi->dev, "setup spi chip %s, width is %d, dma is %d\n",
@@ -1135,14 +1134,26 @@ static int bfin_spi_setup(struct spi_device *spi)
spi_set_ctldata(spi, chip);
dev_dbg(&spi->dev, "chip select number is %d\n", chip->chip_select_num);
- if ((chip->chip_select_num > 0)
- && (chip->chip_select_num <= spi->master->num_chipselect))
- peripheral_request(ssel[spi->master->bus_num]
- [chip->chip_select_num-1], spi->modalias);
+ if (chip->chip_select_num > 0 &&
+ chip->chip_select_num <= spi->master->num_chipselect) {
+ ret = peripheral_request(ssel[spi->master->bus_num]
+ [chip->chip_select_num-1], spi->modalias);
+ if (ret)
+ goto error;
+ }
bfin_spi_cs_deactive(drv_data, chip);
+ ret = 0;
- return 0;
+ error:
+ if (ret) {
+ kfree(chip);
+ if (drv_data->dma_requested)
+ free_dma(drv_data->dma_channel);
+ drv_data->dma_requested = 0;
+ }
+
+ return ret;
}
/*
--
1.6.5.rc1
--
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