From b4b8482690d97ea5421acf71e9e397fe0c5a25b8 Mon Sep 17 00:00:00 2001 From: Roland Stigge Date: Mon, 3 Sep 2012 10:14:29 +0200 Subject: spi/pl022: Fix chipselects pointer computation The new chip select handling via GPIO introduced a pointer computation bug: (int *) pl022 + sizeof(struct pl022) doesn't point to the data immediately after the actual struct pl022 (as was intended) but to a multiple of bytes after it because of the (int *) type. Replacing the kludgy pointer arithmetic with managed memory allocation for the chip selects. Reported-by: Shiraz Hashim Signed-off-by: Roland Stigge Reviewed-by: Linus Walleij Signed-off-by: Mark Brown --- drivers/spi/spi-pl022.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) (limited to 'drivers') diff --git a/drivers/spi/spi-pl022.c b/drivers/spi/spi-pl022.c index 959f2acff2d3..827ad5152d8b 100644 --- a/drivers/spi/spi-pl022.c +++ b/drivers/spi/spi-pl022.c @@ -2053,8 +2053,7 @@ pl022_probe(struct amba_device *adev, const struct amba_id *id) } /* Allocate master with space for data */ - master = spi_alloc_master(dev, sizeof(struct pl022) + sizeof(int) * - num_cs); + master = spi_alloc_master(dev, sizeof(struct pl022)); if (master == NULL) { dev_err(&adev->dev, "probe - cannot alloc SPI master\n"); status = -ENOMEM; @@ -2066,8 +2065,8 @@ pl022_probe(struct amba_device *adev, const struct amba_id *id) pl022->master_info = platform_info; pl022->adev = adev; pl022->vendor = id->data; - /* Point chipselects to allocated memory beyond the main struct */ - pl022->chipselects = (int *) pl022 + sizeof(struct pl022); + pl022->chipselects = devm_kzalloc(dev, num_cs * sizeof(int), + GFP_KERNEL); /* * Bus Number Which has been Assigned to this SSP controller -- cgit v1.2.3