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 <shiraz.linux.kernel@gmail.com>
Signed-off-by: Roland Stigge <stigge@antcom.de>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/drivers/spi/spi-pl022.c b/drivers/spi/spi-pl022.c
index 959f2ac..827ad51 100644
--- a/drivers/spi/spi-pl022.c
+++ b/drivers/spi/spi-pl022.c
@@ -2053,8 +2053,7 @@
}
/* 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->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
