mirror of https://github.com/hak5/openwrt-owl.git
144 lines
4.7 KiB
Diff
144 lines
4.7 KiB
Diff
From f3978e548747dfe988016ef7c99fe50975da90df Mon Sep 17 00:00:00 2001
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From: Vincent Sanders <vincent.sanders@collabora.co.uk>
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Date: Mon, 2 Sep 2013 16:44:57 +0100
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Subject: [PATCH 108/196] vchiq: create_pagelist copes with vmalloc memory
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Signed-off-by: Daniel Stone <daniels@collabora.com>
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---
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.../interface/vchiq_arm/vchiq_2835_arm.c | 83 ++++++++++++++--------
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1 file changed, 53 insertions(+), 30 deletions(-)
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diff --git a/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c
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index 2b5fa56..b3bdaa2 100644
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--- a/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c
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+++ b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c
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@@ -374,6 +374,7 @@ create_pagelist(char __user *buf, size_t count, unsigned short type,
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unsigned int num_pages, offset, i;
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char *addr, *base_addr, *next_addr;
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int run, addridx, actual_pages;
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+ unsigned long *need_release;
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offset = (unsigned int)buf & (PAGE_SIZE - 1);
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num_pages = (count + offset + PAGE_SIZE - 1) / PAGE_SIZE;
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@@ -384,9 +385,10 @@ create_pagelist(char __user *buf, size_t count, unsigned short type,
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** list
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*/
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pagelist = kmalloc(sizeof(PAGELIST_T) +
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- (num_pages * sizeof(unsigned long)) +
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- (num_pages * sizeof(pages[0])),
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- GFP_KERNEL);
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+ (num_pages * sizeof(unsigned long)) +
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+ sizeof(unsigned long) +
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+ (num_pages * sizeof(pages[0])),
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+ GFP_KERNEL);
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vchiq_log_trace(vchiq_arm_log_level,
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"create_pagelist - %x", (unsigned int)pagelist);
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@@ -394,28 +396,44 @@ create_pagelist(char __user *buf, size_t count, unsigned short type,
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return -ENOMEM;
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addrs = pagelist->addrs;
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- pages = (struct page **)(addrs + num_pages);
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+ need_release = (unsigned long *)(addrs + num_pages);
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+ pages = (struct page **)(addrs + num_pages + 1);
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- down_read(&task->mm->mmap_sem);
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- actual_pages = get_user_pages(task, task->mm,
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- (unsigned long)buf & ~(PAGE_SIZE - 1), num_pages,
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- (type == PAGELIST_READ) /*Write */ , 0 /*Force */ ,
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- pages, NULL /*vmas */);
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- up_read(&task->mm->mmap_sem);
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-
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- if (actual_pages != num_pages)
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- {
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- /* This is probably due to the process being killed */
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- while (actual_pages > 0)
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- {
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- actual_pages--;
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- page_cache_release(pages[actual_pages]);
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- }
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- kfree(pagelist);
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- if (actual_pages == 0)
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- actual_pages = -ENOMEM;
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- return actual_pages;
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- }
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+ if (is_vmalloc_addr(buf)) {
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+ for (actual_pages = 0; actual_pages < num_pages; actual_pages++) {
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+ pages[actual_pages] = vmalloc_to_page(buf + (actual_pages * PAGE_SIZE));
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+ }
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+ *need_release = 0; /* do not try and release vmalloc pages */
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+ } else {
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+ down_read(&task->mm->mmap_sem);
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+ actual_pages = get_user_pages(task, task->mm,
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+ (unsigned long)buf & ~(PAGE_SIZE - 1),
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+ num_pages,
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+ (type == PAGELIST_READ) /*Write */ ,
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+ 0 /*Force */ ,
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+ pages,
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+ NULL /*vmas */);
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+ up_read(&task->mm->mmap_sem);
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+
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+ if (actual_pages != num_pages) {
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+ vchiq_log_info(vchiq_arm_log_level,
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+ "create_pagelist - only %d/%d pages locked",
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+ actual_pages,
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+ num_pages);
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+
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+ /* This is probably due to the process being killed */
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+ while (actual_pages > 0)
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+ {
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+ actual_pages--;
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+ page_cache_release(pages[actual_pages]);
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+ }
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+ kfree(pagelist);
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+ if (actual_pages == 0)
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+ actual_pages = -ENOMEM;
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+ return actual_pages;
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+ }
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+ *need_release = 1; /* release user pages */
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+ }
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pagelist->length = count;
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pagelist->type = type;
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@@ -482,6 +500,7 @@ create_pagelist(char __user *buf, size_t count, unsigned short type,
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static void
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free_pagelist(PAGELIST_T *pagelist, int actual)
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{
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+ unsigned long *need_release;
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struct page **pages;
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unsigned int num_pages, i;
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@@ -492,7 +511,8 @@ free_pagelist(PAGELIST_T *pagelist, int actual)
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(pagelist->length + pagelist->offset + PAGE_SIZE - 1) /
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PAGE_SIZE;
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- pages = (struct page **)(pagelist->addrs + num_pages);
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+ need_release = (unsigned long *)(pagelist->addrs + num_pages);
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+ pages = (struct page **)(pagelist->addrs + num_pages + 1);
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/* Deal with any partial cache lines (fragments) */
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if (pagelist->type >= PAGELIST_READ_WITH_FRAGMENTS) {
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@@ -528,11 +548,14 @@ free_pagelist(PAGELIST_T *pagelist, int actual)
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up(&g_free_fragments_sema);
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}
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- for (i = 0; i < num_pages; i++) {
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- if (pagelist->type != PAGELIST_WRITE)
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- set_page_dirty(pages[i]);
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- page_cache_release(pages[i]);
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- }
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+ if (*need_release) {
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+ for (i = 0; i < num_pages; i++) {
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+ if (pagelist->type != PAGELIST_WRITE)
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+ set_page_dirty(pages[i]);
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+
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+ page_cache_release(pages[i]);
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+ }
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+ }
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kfree(pagelist);
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}
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--
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1.9.1
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