Commit e256caa7 authored by Vasant Hegde's avatar Vasant Hegde Committed by Michael Ellerman

powerpc/mm: Allow user space to map rtas_rmo_buf

With commit 90a545e9 (restrict /dev/mem to idle io memory ranges) mapping
rtas_rmo_buf from user space is failing. Hence we are not able to make
RTAS syscall.

This patch calls page_is_rtas_user_buf before calling iomem_is_exclusive
in  devmem_is_allowed(). This will allow user space to map rtas_rmo_buf
and we are able to make RTAS syscall.
Reported-by: default avatarBharata B Rao <bharata@linux.vnet.ibm.com>
CC: Nathan Fontenot <nfont@linux.vnet.ibm.com>
Signed-off-by: default avatarVasant Hegde <hegdevasant@linux.vnet.ibm.com>
Acked-by: default avatarDan Williams <dan.j.williams@intel.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 0e2bce74
...@@ -560,12 +560,12 @@ subsys_initcall(add_system_ram_resources); ...@@ -560,12 +560,12 @@ subsys_initcall(add_system_ram_resources);
*/ */
int devmem_is_allowed(unsigned long pfn) int devmem_is_allowed(unsigned long pfn)
{ {
if (page_is_rtas_user_buf(pfn))
return 1;
if (iomem_is_exclusive(PFN_PHYS(pfn))) if (iomem_is_exclusive(PFN_PHYS(pfn)))
return 0; return 0;
if (!page_is_ram(pfn)) if (!page_is_ram(pfn))
return 1; return 1;
if (page_is_rtas_user_buf(pfn))
return 1;
return 0; return 0;
} }
#endif /* CONFIG_STRICT_DEVMEM */ #endif /* CONFIG_STRICT_DEVMEM */
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment