This is a note to let you know that I've just added the patch titled spi: Fix mapping from vmalloc-ed buffer to scatter list to the 3.17-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: spi-fix-mapping-from-vmalloc-ed-buffer-to-scatter-list.patch and it can be found in the queue-3.17 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From c1aefbdd050e1fb15e92bcaf34d95b17ea952097 Mon Sep 17 00:00:00 2001 From: Charles Keepax <ckeepax@xxxxxxxxxxxxxxxxxxxxxxxxxxx> Date: Mon, 17 Nov 2014 09:14:31 +0000 Subject: spi: Fix mapping from vmalloc-ed buffer to scatter list From: Charles Keepax <ckeepax@xxxxxxxxxxxxxxxxxxxxxxxxxxx> commit c1aefbdd050e1fb15e92bcaf34d95b17ea952097 upstream. We can only use page_address on memory that has been mapped using kmap, when the buffer passed to the SPI has been allocated by vmalloc the page has not necessarily been mapped through kmap. This means sometimes page_address will return NULL causing the pointer we pass to sg_set_buf to be invalid. As we only call page_address so that we can pass a virtual address to sg_set_buf which will then immediately call virt_to_page on it, fix this by calling sg_set_page directly rather then relying on the sg_set_buf helper. Signed-off-by: Charles Keepax <ckeepax@xxxxxxxxxxxxxxxxxxxxxxxxxxx> Signed-off-by: Mark Brown <broonie@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/spi/spi.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -609,13 +609,13 @@ static int spi_map_buf(struct spi_master sg_free_table(sgt); return -ENOMEM; } - sg_buf = page_address(vm_page) + - ((size_t)buf & ~PAGE_MASK); + sg_set_page(&sgt->sgl[i], vm_page, + min, offset_in_page(buf)); } else { sg_buf = buf; + sg_set_buf(&sgt->sgl[i], sg_buf, min); } - sg_set_buf(&sgt->sgl[i], sg_buf, min); buf += min; len -= min; Patches currently in stable-queue which might be from ckeepax@xxxxxxxxxxxxxxxxxxxxxxxxxxx are queue-3.17/spi-fix-mapping-from-vmalloc-ed-buffer-to-scatter-list.patch queue-3.17/asoc-wm_adsp-avoid-attempt-to-free-buffers-that-might-still-be-in-use.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html