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iommu/fsl: Fix PAMU window size check.

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is_power_of_2 requires an unsigned long parameter which would
lead to truncation of 64 bit values on 32 bit architectures.

__ffs also expects an unsigned long parameter thus won't work
for 64 bit values on 32 bit architectures.

Signed-off-by: Varun Sethi <Varun.Sethi@freescale.com>
Tested-by: Emil Medve <Emilian.Medve@Freescale.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Varun Sethi 2014-06-24 19:27:15 +05:30 committed by Joerg Roedel
parent cd3de83f14
commit d033f48f3a
2 changed files with 5 additions and 5 deletions
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8
drivers/iommu/fsl_pamu.c
View file

@ -170,10 +170,10 @@ int pamu_disable_liodn(int liodn)
static unsigned int map_addrspace_size_to_wse(phys_addr_t addrspace_size)
{
/* Bug if not a power of 2 */
BUG_ON(!is_power_of_2(addrspace_size));
BUG_ON((addrspace_size & (addrspace_size - 1)));
/* window size is 2^(WSE+1) bytes */
return __ffs(addrspace_size) - 1;
return fls64(addrspace_size) - 2;
}
/* Derive the PAACE window count encoding for the subwindow count */
@ -351,7 +351,7 @@ int pamu_config_ppaace(int liodn, phys_addr_t win_addr, phys_addr_t win_size,
struct paace *ppaace;
unsigned long fspi;
if (!is_power_of_2(win_size) || win_size < PAMU_PAGE_SIZE) {
if ((win_size & (win_size - 1)) || win_size < PAMU_PAGE_SIZE) {
pr_debug("window size too small or not a power of two %llx\n", win_size);
return -EINVAL;
}
@ -464,7 +464,7 @@ int pamu_config_spaace(int liodn, u32 subwin_cnt, u32 subwin,
return -ENOENT;
}
if (!is_power_of_2(subwin_size) || subwin_size < PAMU_PAGE_SIZE) {
if ((subwin_size & (subwin_size - 1)) || subwin_size < PAMU_PAGE_SIZE) {
pr_debug("subwindow size out of range, or not a power of 2\n");
return -EINVAL;
}

2
drivers/iommu/fsl_pamu_domain.c
View file

@ -301,7 +301,7 @@ static int check_size(u64 size, dma_addr_t iova)
* Size must be a power of two and at least be equal
* to PAMU page size.
*/
if (!is_power_of_2(size) || size < PAMU_PAGE_SIZE) {
if ((size & (size - 1)) || size < PAMU_PAGE_SIZE) {
pr_debug("%s: size too small or not a power of two\n", __func__);
return -EINVAL;
}