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lib: logic_pio: Avoid possible overlap for unregistering regions 

The code was originally written to not support unregistering logical PIO
regions.

To accommodate supporting unregistering logical PIO regions, subtly modify
LOGIC_PIO_CPU_MMIO region registration code, such that the "end" of the
registered regions is the "end" of the last region, and not the sum of
the sizes of all the registered regions.

Cc: stable@vger.kernel.org
Signed-off-by: John Garry <john.garry@huawei.com>
Signed-off-by: Wei Xu <xuwei5@hisilicon.com>
alistair/sunxi64-5.4-dsi
John Garry 2019-07-30 21:29:53 +08:00 committed by Wei Xu
parent 06709e81c6
commit 0a27142bd1
1 changed files with 5 additions and 5 deletions
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10
lib/logic_pio.c
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@ -35,7 +35,7 @@ int logic_pio_register_range(struct logic_pio_hwaddr *new_range)
struct logic_pio_hwaddr *range;
resource_size_t start;
resource_size_t end;
resource_size_t mmio_sz = 0;
resource_size_t mmio_end = 0;
resource_size_t iio_sz = MMIO_UPPER_LIMIT;
int ret = 0;
@ -56,7 +56,7 @@ int logic_pio_register_range(struct logic_pio_hwaddr *new_range)
/* for MMIO ranges we need to check for overlap */
if (start >= range->hw_start + range->size ||
end < range->hw_start) {
mmio_sz += range->size;
mmio_end = range->io_start + range->size;
} else {
ret = -EFAULT;
goto end_register;
@ -69,16 +69,16 @@ int logic_pio_register_range(struct logic_pio_hwaddr *new_range)
/* range not registered yet, check for available space */
if (new_range->flags == LOGIC_PIO_CPU_MMIO) {
if (mmio_sz + new_range->size - 1 > MMIO_UPPER_LIMIT) {
if (mmio_end + new_range->size - 1 > MMIO_UPPER_LIMIT) {
/* if it's too big check if 64K space can be reserved */
if (mmio_sz + SZ_64K - 1 > MMIO_UPPER_LIMIT) {
if (mmio_end + SZ_64K - 1 > MMIO_UPPER_LIMIT) {
ret = -E2BIG;
goto end_register;
}
new_range->size = SZ_64K;
pr_warn("Requested IO range too big, new size set to 64K\n");
}
new_range->io_start = mmio_sz;
new_range->io_start = mmio_end;
} else if (new_range->flags == LOGIC_PIO_INDIRECT) {
if (iio_sz + new_range->size - 1 > IO_SPACE_LIMIT) {
ret = -E2BIG;