Hello Ramalingam C,
The patch 6498bf5800a3: "drm: revocation check at drm subsystem" from
May 7, 2019, leads to the following static checker warning:
drivers/gpu/drm/drm_hdcp.c:195 drm_hdcp_parse_hdcp2_srm()
warn: mask and shift to zero
drivers/gpu/drm/drm_hdcp.c
190 DRM_ERROR("No vrl found\n");
191 return -EINVAL;
192 }
193
194 buf += DRM_HDCP_2_VRL_LENGTH_SIZE;
195 ksv_count = (*buf << 2) | DRM_HDCP_2_KSV_COUNT_2_LSBITS(*(buf + 1));
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
This macro is always zero.
196 if (!ksv_count) {
197 DRM_DEBUG("Revoked KSV count is 0\n");
198 return count;
199 }
200
The define is:
#define DRM_HDCP_2_KSV_COUNT_2_LSBITS(byte) (((byte) & 0xC) >> 6)
0xC >> 6 is always zero.
regards,
dan carpenter
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