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drm/exynos: fix missing decrement of retry counter 

[ Upstream commit 1bbbab097a ]

Currently the retry counter is not being decremented, leading to a
potential infinite spin if the scalar_reads don't change state.

Addresses-Coverity: ("Infinite loop")
Fixes: 280e54c9f6 ("drm/exynos: scaler: Reset hardware before starting the operation")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Colin Ian King 2019-07-22 23:25:35 +01:00 committed by Greg Kroah-Hartman
parent c256729f26
commit cf9a18d7bc
1 changed files with 2 additions and 2 deletions
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4
drivers/gpu/drm/exynos/exynos_drm_scaler.c
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@ -108,12 +108,12 @@ static inline int scaler_reset(struct scaler_context *scaler)
scaler_write(SCALER_CFG_SOFT_RESET, SCALER_CFG);
do {
cpu_relax();
} while (retry > 1 &&
} while (--retry > 1 &&
scaler_read(SCALER_CFG) & SCALER_CFG_SOFT_RESET);
do {
cpu_relax();
scaler_write(1, SCALER_INT_EN);
} while (retry > 0 && scaler_read(SCALER_INT_EN) != 1);
} while (--retry > 0 && scaler_read(SCALER_INT_EN) != 1);
return retry ? 0 : -EIO;
}