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| author | Ian Munsie <imunsie@au1.ibm.com> | 2014-12-08 09:18:01 +0100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2014-12-12 03:06:48 +0100 |
| commit | b123429e6a9e8d03aacf888d23262835f0081448 (patch) | |
| tree | b1b9c9eb381437982de078d061c274264a25c104 /drivers/misc/cxl/file.c | |
| parent | cxl: Add timeout to process element commands (diff) | |
| download | linux-b123429e6a9e8d03aacf888d23262835f0081448.tar.xz linux-b123429e6a9e8d03aacf888d23262835f0081448.zip | |
cxl: Unmap MMIO regions when detaching a context
If we need to force detach a context (e.g. due to EEH or simply force
unbinding the driver) we should prevent the userspace contexts from
being able to access the Problem State Area MMIO region further, which
they may have mapped with mmap().
This patch unmaps any mapped MMIO regions when detaching a userspace
context.
Cc: stable@vger.kernel.org
Signed-off-by: Ian Munsie <imunsie@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'drivers/misc/cxl/file.c')
| -rw-r--r-- | drivers/misc/cxl/file.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/misc/cxl/file.c b/drivers/misc/cxl/file.c index 378b099e7c0b..e9f2f10dbb37 100644 --- a/drivers/misc/cxl/file.c +++ b/drivers/misc/cxl/file.c @@ -77,7 +77,7 @@ static int __afu_open(struct inode *inode, struct file *file, bool master) goto err_put_afu; } - if ((rc = cxl_context_init(ctx, afu, master))) + if ((rc = cxl_context_init(ctx, afu, master, inode->i_mapping))) goto err_put_afu; pr_devel("afu_open pe: %i\n", ctx->pe); @@ -113,6 +113,10 @@ static int afu_release(struct inode *inode, struct file *file) __func__, ctx->pe); cxl_context_detach(ctx); + mutex_lock(&ctx->mapping_lock); + ctx->mapping = NULL; + mutex_unlock(&ctx->mapping_lock); + put_device(&ctx->afu->dev); /* |