Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-12-26 12:52:30 +00:00
Code Issues Packages Projects Releases Wiki Activity

intel_th: msu: Fix vmalloced buffers

Browse Source 
After commit f5ff79fddf ("dma-mapping: remove CONFIG_DMA_REMAP") there's
a chance of DMA buffer getting allocated via vmalloc(), which messes up
the mmapping code:

> RIP: msc_mmap_fault [intel_th_msu]
> Call Trace:
>  <TASK>
>  __do_fault
>  do_fault
...

Fix this by accounting for vmalloc possibility.

Fixes: ba39bd8306 ("intel_th: msu: Switch over to scatterlist")
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Link: https://lore.kernel.org/r/20220705082637.59979-4-alexander.shishkin@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alexander Shishkin 2022-07-05 11:26:34 +03:00 committed by Greg Kroah-Hartman
parent 82f76a4a72
commit ac12ad3ccf
1 changed files with 12 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
drivers/hwtracing/intel_th/msu.c
View File

@ -1067,6 +1067,16 @@ msc_buffer_set_uc(struct msc *msc) {}
static inline void msc_buffer_set_wb(struct msc *msc) {}
#endif /* CONFIG_X86 */
static struct page *msc_sg_page(struct scatterlist *sg)
{
void *addr = sg_virt(sg);
if (is_vmalloc_addr(addr))
return vmalloc_to_page(addr);
return sg_page(sg);
}
/**
* msc_buffer_win_alloc() - alloc a window for a multiblock mode
* @msc: MSC device
@ -1137,7 +1147,7 @@ static void __msc_buffer_win_free(struct msc *msc, struct msc_window *win)
int i;
for_each_sg(win->sgt->sgl, sg, win->nr_segs, i) {
struct page *page = sg_page(sg);
struct page *page = msc_sg_page(sg);
page->mapping = NULL;
dma_free_coherent(msc_dev(win->msc)->parent->parent, PAGE_SIZE,
@ -1401,7 +1411,7 @@ found:
pgoff -= win->pgoff;
for_each_sg(win->sgt->sgl, sg, win->nr_segs, blk) {
struct page *page = sg_page(sg);
struct page *page = msc_sg_page(sg);
size_t pgsz = PFN_DOWN(sg->length);
if (pgoff < pgsz)