diff options
| author | Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2017-06-02 16:52:03 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2017-06-05 18:50:41 +0300 |
| commit | 2a457fb31df62c6b482f78e4f74aaed99271f44d (patch) | |
| tree | ca361e87b2d0d587942b67279294dcb6e42aa48a /drivers/firmware/efi/capsule-loader.c | |
| parent | 3fabd628d5ea24b02ddb1230ffca1df0f779f84e (diff) | |
| download | linux-2a457fb31df62c6b482f78e4f74aaed99271f44d.tar.xz | |
efi/capsule-loader: Use page addresses rather than struct page pointers
To give some leeway to code that handles non-standard capsule headers,
let's keep an array of page addresses rather than struct page pointers.
This gives special implementations of efi_capsule_setup_info() the
opportunity to mangle the payload a bit before it is presented to the
firmware, without putting any knowledge of the nature of such quirks
into the generic code.
Tested-by: Bryan O'Donoghue <pure.logic@nexus-software.ie>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-efi@vger.kernel.org
Link: http://lkml.kernel.org/r/20170602135207.21708-10-ard.biesheuvel@linaro.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'drivers/firmware/efi/capsule-loader.c')
| -rw-r--r-- | drivers/firmware/efi/capsule-loader.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/drivers/firmware/efi/capsule-loader.c b/drivers/firmware/efi/capsule-loader.c index cbc3526953d5..ec8ac5c4dd84 100644 --- a/drivers/firmware/efi/capsule-loader.c +++ b/drivers/firmware/efi/capsule-loader.c @@ -20,6 +20,10 @@ #define NO_FURTHER_WRITE_ACTION -1 +#ifndef phys_to_page +#define phys_to_page(x) pfn_to_page((x) >> PAGE_SHIFT) +#endif + /** * efi_free_all_buff_pages - free all previous allocated buffer pages * @cap_info: pointer to current instance of capsule_info structure @@ -31,7 +35,7 @@ static void efi_free_all_buff_pages(struct capsule_info *cap_info) { while (cap_info->index > 0) - __free_page(cap_info->pages[--cap_info->index]); + __free_page(phys_to_page(cap_info->pages[--cap_info->index])); cap_info->index = NO_FURTHER_WRITE_ACTION; } @@ -161,12 +165,12 @@ static ssize_t efi_capsule_write(struct file *file, const char __user *buff, goto failed; } - cap_info->pages[cap_info->index++] = page; + cap_info->pages[cap_info->index++] = page_to_phys(page); cap_info->page_bytes_remain = PAGE_SIZE; + } else { + page = phys_to_page(cap_info->pages[cap_info->index - 1]); } - page = cap_info->pages[cap_info->index - 1]; - kbuff = kmap(page); kbuff += PAGE_SIZE - cap_info->page_bytes_remain; |