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| author | Vasant Hegde <hegdevasant@linux.vnet.ibm.com> | 2016-01-21 21:45:31 +0530 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2016-01-25 16:31:13 +1100 |
| commit | e256caa7d0515e301f8c8c6e7d1204a2b67b1381 (patch) | |
| tree | df649e11ac264790fb1cecaf96cb13d58fd22150 /arch | |
| parent | 0e2bce7411542fa336ef49041471ea3e7dc911f8 (diff) | |
| download | linux-e256caa7d0515e301f8c8c6e7d1204a2b67b1381.tar.gz linux-e256caa7d0515e301f8c8c6e7d1204a2b67b1381.tar.bz2 linux-e256caa7d0515e301f8c8c6e7d1204a2b67b1381.zip | |
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: Bharata B Rao <bharata@linux.vnet.ibm.com>
CC: Nathan Fontenot <nfont@linux.vnet.ibm.com>
Signed-off-by: Vasant Hegde <hegdevasant@linux.vnet.ibm.com>
Acked-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/mm/mem.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c index 22d94c3e6fc4..d0f0a514b04e 100644 --- a/arch/powerpc/mm/mem.c +++ b/arch/powerpc/mm/mem.c @@ -560,12 +560,12 @@ subsys_initcall(add_system_ram_resources); */ int devmem_is_allowed(unsigned long pfn) { + if (page_is_rtas_user_buf(pfn)) + return 1; if (iomem_is_exclusive(PFN_PHYS(pfn))) return 0; if (!page_is_ram(pfn)) return 1; - if (page_is_rtas_user_buf(pfn)) - return 1; return 0; } #endif /* CONFIG_STRICT_DEVMEM */ |