From 0ed2424b911f3a058dfea01b78817abed767433d Mon Sep 17 00:00:00 2001
From: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Date: Thu, 24 May 2018 11:27:27 +0300
Subject: [PATCH] intel_th: Use correct device when freeing buffers
Git-commit: 0ed2424b911f3a058dfea01b78817abed767433d
Patch-mainline: v4.17
References: bsc#1051510
Commit d5c435df4a890 ("intel_th: msu: Use the real device in case of IOMMU
domain allocation") changes dma buffer allocation to use the actual
underlying device, but forgets to change the deallocation path, which leads
to (if you've got CAP_SYS_RAWIO):
> # echo 0,0 > /sys/bus/intel_th/devices/0-msc0/nr_pages
> ------------[ cut here ]------------
> kernel BUG at ../linux/drivers/iommu/intel-iommu.c:3670!
> CPU: 3 PID: 231 Comm: sh Not tainted 4.17.0-rc1+ #2729
> RIP: 0010:intel_unmap+0x11e/0x130
...
> Call Trace:
> intel_free_coherent+0x3e/0x60
> msc_buffer_win_free+0x100/0x160 [intel_th_msu]
This patch fixes the buffer deallocation code to use the correct device.
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Fixes: d5c435df4a890 ("intel_th: msu: Use the real device in case of IOMMU domain allocation")
Reported-by: Baofeng Tian <baofeng.tian@intel.com>
Cc: stable@vger.kernel.org # v4.14+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/hwtracing/intel_th/msu.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
--- a/drivers/hwtracing/intel_th/msu.c
+++ b/drivers/hwtracing/intel_th/msu.c
@@ -741,8 +741,8 @@ err_nomem:
/* Reset the page to write-back before releasing */
set_memory_wb((unsigned long)win->block[i].bdesc, 1);
#endif
- dma_free_coherent(msc_dev(msc), size, win->block[i].bdesc,
- win->block[i].addr);
+ dma_free_coherent(msc_dev(msc)->parent->parent, size,
+ win->block[i].bdesc, win->block[i].addr);
}
kfree(win);
@@ -777,7 +777,7 @@ static void msc_buffer_win_free(struct m
/* Reset the page to write-back before releasing */
set_memory_wb((unsigned long)win->block[i].bdesc, 1);
#endif
- dma_free_coherent(msc_dev(win->msc), PAGE_SIZE,
+ dma_free_coherent(msc_dev(win->msc)->parent->parent, PAGE_SIZE,
win->block[i].bdesc, win->block[i].addr);
}