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TexSubImage2D weirdness

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I'd like to ask - I'm updating half of the texture with OpenCL program and another half on CPU. But calling:

glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, (height - delta_height), GL_RGBA, GL_FLOAT, data_v);

Updates half of the texture (done by CPU) and ignores texture updated by OpenCL. Note that I make sure that OpenCL finishes before I do the TexSubImage call.

Any idea/hint (e.g. what I missed)?

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