Re: [PATCH] Staging: TIDSPBRIDGE: Use vm_iomap_memory for mmap-ing instead of remap_pfn_range

[Steven Luo <steven@steven676.net>]

This patch causes problems with DSP codecs on OMAP3 devices running
Android -- specifically, when the decoder is cleaning up after itself,
munmap() of the mapped area fails, leading to a memory leak which
eventually crashes the system.

As far as I can tell, the code with this patch applied reduces to
(ignoring checks and such)

remap_pfn_range(vma, vma->vm_start,
	(pdata->phys_mempool_base >> PAGE_SHIFT) + vma->vm_pgoff,
	vma->vm_end - vma->vm_start,
	vma->vm_page_prot);

whereas the original was

> -	status = remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
> -				 vma->vm_end - vma->vm_start,
> -				 vma->vm_page_prot);

We're subtracting (pdata->phys_mempool_base >> PAGE_SHIFT) from
vma->vm_pgoff before calling vm_iomap_memory() to address the issue --
if that's satisfactory to everyone involved, I can submit the following
patch.

-Steven Luo

(please cc, not subscribed)

From: Steven Luo <steven@steven676.net>
Date: Sat, 7 Dec 2013 02:11:20 -0800
Subject: [PATCH] tidspbridge: fix last patch to map same region of physical
 memory as before

Commit 559c71fe5dc3 ("Staging: TIDSPBRIDGE: Use vm_iomap_memory for
mmap-ing instead of remap_pfn_range") had the effect of inadvertently
shifting the start of the physical memory area mapped by
pdata->phys_mempool_base.  Correct this by subtracting that shift before
calling vm_iomap_memory() and adding it back afterwards.

Reported-by: Dheeraj CVR <cvr.dheeraj@gmail.com>
Signed-off-by: Steven Luo <steven@steven676.net>
---
 drivers/staging/tidspbridge/rmgr/drv_interface.c |   29 +++++++++++++++++++---
 1 file changed, 26 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/tidspbridge/rmgr/drv_interface.c b/drivers/staging/tidspbridge/rmgr/drv_interface.c
index 83cc3a5..d7f7d04 100644
--- a/drivers/staging/tidspbridge/rmgr/drv_interface.c
+++ b/drivers/staging/tidspbridge/rmgr/drv_interface.c
@@ -258,6 +258,9 @@ err:
 /* This function maps kernel space memory to user space memory. */
 static int bridge_mmap(struct file *filp, struct vm_area_struct *vma)
 {
+	unsigned long base_pgoff;
+	int status;
+
 	struct omap_dsp_platform_data *pdata =
 	    omap_dspbridge_dev->dev.platform_data;
 	
@@ -269,9 +272,29 @@ static int bridge_mmap(struct file *filp, struct vm_area_struct *vma)
 		vma->vm_start, vma->vm_end, vma->vm_page_prot,
 		vma->vm_flags);
 
-	return vm_iomap_memory(vma,
-			       pdata->phys_mempool_base,
-			       pdata->phys_mempool_size);
+	/*
+	 * vm_iomap_memory() expects vma->vm_pgoff to be expressed as an offset
+	 * from the start of the physical memory pool, but we're called with
+	 * a pfn (physical page number) stored there instead.
+	 *
+	 * To avoid duplicating lots of tricky overflow checking logic,
+	 * temporarily convert vma->vm_pgoff to the offset vm_iomap_memory()
+	 * expects, but restore the original value once the mapping has been
+	 * created.
+	 */
+	base_pgoff = pdata->phys_mempool_base >> PAGE_SHIFT;
+	if (vma->vm_pgoff < base_pgoff)
+		return -EINVAL;
+	vma->vm_pgoff -= base_pgoff;
+
+	status = vm_iomap_memory(vma,
+				 pdata->phys_mempool_base,
+				 pdata->phys_mempool_size);
+
+	/* Restore the original value of vma->vm_pgoff */
+	vma->vm_pgoff += base_pgoff;
+
+	return status;
 }
 
 static const struct file_operations bridge_fops = {
-- 
1.7.10.4