ata: sata_mv: Replace mdelay with usleep_range in mv_reset_channel

After checking all possible call chains to mv_reset_channel here,
my tool finds that mv_reset_channel is never called in atomic context,
namely never in an interrupt handler or holding a spinlock.
Thus mdelay can be replaced with usleep_range to avoid busy wait.

This is found by a static analysis tool named DCNS written by myself.

Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

diff --git a/drivers/ata/sata_mv.c b/drivers/ata/sata_mv.c
index cc208b7..42d4589 100644 (file)
--- a/drivers/ata/sata_mv.c
+++ b/drivers/ata/sata_mv.c
@@ -3596,7 +3596,7 @@ static void mv_reset_channel(struct mv_host_priv *hpriv, void __iomem *mmio,
        hpriv->ops->phy_errata(hpriv, mmio, port_no);
 
        if (IS_GEN_I(hpriv))
-               mdelay(1);
+               usleep_range(500, 1000);
 }
 
 static void mv_pmp_select(struct ata_port *ap, int pmp)