diff mbox

[23/39] usb: musb: ux500: harden checks for platform data

Message ID 1368611522-9984-24-git-send-email-lee.jones@linaro.org
State Accepted
Commit 5f6091a023ca435c49467348e388fa89e635436a
Headers show

Commit Message

Lee Jones May 15, 2013, 9:51 a.m. UTC 
In its current state, the ux500-musb driver uses platform data pointers
blindly with no prior checking. If no platform data pointer is passed
this will Oops the kernel. In this patch we ensure platform data and
board data are present prior to using them.

Cc: Felipe Balbi <balbi@ti.com>
Cc: linux-usb@vger.kernel.org
Acked-by: Fabio Baltieri <fabio.baltieri@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
---
 drivers/usb/musb/ux500_dma.c |   11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)
diff mbox

Patch

diff --git a/drivers/usb/musb/ux500_dma.c b/drivers/usb/musb/ux500_dma.c
index 382291b..4bd5400 100644
--- a/drivers/usb/musb/ux500_dma.c
+++ b/drivers/usb/musb/ux500_dma.c
@@ -289,7 +289,7 @@  static int ux500_dma_controller_start(struct dma_controller *c)
 	struct musb *musb = controller->private_data;
 	struct device *dev = musb->controller;
 	struct musb_hdrc_platform_data *plat = dev->platform_data;
-	struct ux500_musb_board_data *data = plat->board_data;
+	struct ux500_musb_board_data *data;
 	struct dma_channel *dma_channel = NULL;
 	u32 ch_num;
 	u8 dir;
@@ -299,14 +299,19 @@  static int ux500_dma_controller_start(struct dma_controller *c)
 	struct ux500_dma_channel *channel_array;
 	dma_cap_mask_t mask;
 
+	if (!plat) {
+		dev_err(musb->controller, "No platform data\n");
+		return -EINVAL;
+	}
 
+	data = plat->board_data;
 
 	dma_cap_zero(mask);
 	dma_cap_set(DMA_SLAVE, mask);
 
 	/* Prepare the loop for RX channels */
 	channel_array = controller->rx_channel;
-	param_array = data->dma_rx_param_array;
+	param_array = data ? data->dma_rx_param_array : NULL;
 
 	for (dir = 0; dir < 2; dir++) {
 		for (ch_num = 0;
@@ -339,7 +344,7 @@  static int ux500_dma_controller_start(struct dma_controller *c)
 
 		/* Prepare the loop for TX channels */
 		channel_array = controller->tx_channel;
-		param_array = data->dma_tx_param_array;
+		param_array = data ? data->dma_tx_param_array : NULL;
 		is_tx = 1;
 	}