[ldv-project] [PATCH v2] mtd: spi-nor: hisi-sfc: Remove excessive clk_disable_unprepare()

[Evgeny Novikov]

hisi_spi_nor_probe() invokes clk_disable_unprepare() on all paths after
successful call of clk_prepare_enable(). Besides, the clock is enabled by
hispi_spi_nor_prep() and disabled by hispi_spi_nor_unprep(). So at remove
time it is not possible to have the clock enabled. The patch removes
excessive clk_disable_unprepare() from hisi_spi_nor_remove().

Found by Linux Driver Verification project (linuxtesting.org).

Fixes: e523f11141bd ("mtd: spi-nor: add hisilicon spi-nor flash controller driver")
Signed-off-by: Evgeny Novikov <novikov at ispras.ru>
Reviewed-by: Pratyush Yadav <p.yadav at ti.com>
---
v2: Fix notes from Pratyush Yadav:
    - Describe better why clock disabling is not necessary at remove time.
    - Add tag Fixes.
---
 drivers/mtd/spi-nor/controllers/hisi-sfc.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/mtd/spi-nor/controllers/hisi-sfc.c b/drivers/mtd/spi-nor/controllers/hisi-sfc.c
index 47fbf1d1e557..516e50269478 100644
--- a/drivers/mtd/spi-nor/controllers/hisi-sfc.c
+++ b/drivers/mtd/spi-nor/controllers/hisi-sfc.c
@@ -477,7 +477,6 @@ static int hisi_spi_nor_remove(struct platform_device *pdev)
 
 	hisi_spi_nor_unregister_all(host);
 	mutex_destroy(&host->lock);
-	clk_disable_unprepare(host->clk);
 	return 0;
 }
 
-- 
2.26.2