  In this article, we study the mod $\ell$ cohomology of some Deligne-Lusztig
varieties for $\operatorname{GL}_n(q)$. We prove that the cohomology groups of
these varieties are torsion-free under some conditions on the characteristic.
Under the torsion-free assumption we can compute the cohomology groups
explicitly and we prove that the cohomology complex satisfies partial-tilting
condition, which is one of the necessary conditions in the geometric version of
Brou\'{e}'s abelian defect group conjecture.
