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| author | Alan Liu <HaoPing.Liu@amd.com> | 2022-10-24 14:15:30 +0800 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2022-10-27 15:12:08 -0400 |
| commit | 7117007edad2299f2f093cdcfa813beb646d913e (patch) | |
| tree | 333ea2c96cd279ff27f86cf62694c813b6872f59 /drivers/gpu/drm/amd/amdgpu/amdgpu_securedisplay.c | |
| parent | 1ed0e176902483e67cd02530d387a7551b0e99a4 (diff) | |
| download | linux-7117007edad2299f2f093cdcfa813beb646d913e.tar.gz linux-7117007edad2299f2f093cdcfa813beb646d913e.tar.bz2 linux-7117007edad2299f2f093cdcfa813beb646d913e.zip | |
drm/amdgpu: Move the mutex_lock to protect the return status of securedisplay command buffer
[Why]
Before we call psp_securedisplay_invoke(), we call
psp_prep_securedisplay_cmd_buf() to prepare and initialize the command
buffer.
However, we didn't use the mutex_lock to protect the status of command
buffer. So when multiple threads are using the command buffer, after
thread A return from psp_securedisplay_invoke() and the command buffer
status is set to SUCCESS, another thread B may call
psp_prep_securedisplay_cmd_buf() and initialize the status to FAILURE
again, and cause Thread A to get a failure return status.
[How]
Move the mutex_lock out of psp_securedisplay_invoke() to its caller to
cover psp_prep_securedisplay_cmd_buf() and the code checking the return
status of command buffer.
Signed-off-by: Alan Liu <HaoPing.Liu@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_securedisplay.c')
| -rw-r--r-- | drivers/gpu/drm/amd/amdgpu/amdgpu_securedisplay.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_securedisplay.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_securedisplay.c index cc7597a15fe9..2c1d82fc4c34 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_securedisplay.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_securedisplay.c @@ -121,6 +121,7 @@ static ssize_t amdgpu_securedisplay_debugfs_write(struct file *f, const char __u switch (op) { case 1: + mutex_lock(&psp->securedisplay_context.mutex); psp_prep_securedisplay_cmd_buf(psp, &securedisplay_cmd, TA_SECUREDISPLAY_COMMAND__QUERY_TA); ret = psp_securedisplay_invoke(psp, TA_SECUREDISPLAY_COMMAND__QUERY_TA); @@ -131,8 +132,10 @@ static ssize_t amdgpu_securedisplay_debugfs_write(struct file *f, const char __u else psp_securedisplay_parse_resp_status(psp, securedisplay_cmd->status); } + mutex_unlock(&psp->securedisplay_context.mutex); break; case 2: + mutex_lock(&psp->securedisplay_context.mutex); psp_prep_securedisplay_cmd_buf(psp, &securedisplay_cmd, TA_SECUREDISPLAY_COMMAND__SEND_ROI_CRC); securedisplay_cmd->securedisplay_in_message.send_roi_crc.phy_id = phy_id; @@ -146,6 +149,7 @@ static ssize_t amdgpu_securedisplay_debugfs_write(struct file *f, const char __u psp_securedisplay_parse_resp_status(psp, securedisplay_cmd->status); } } + mutex_unlock(&psp->securedisplay_context.mutex); break; default: dev_err(adev->dev, "Invalid input: %s\n", str); |