[libata] AHCI: fix newly introduced host-reset bug

The recent fix to host reset introduced a problem, whereby AHCI-enable
bit would be cleared upon reset, if it was not asserted prior to reset.

Unconditionally enable AHCI-enable bit.

Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index 93bcb2c..c8ab947 100644 (file)
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -898,8 +898,10 @@ static int ahci_reset_controller(struct ata_host *host)
         * AHCI-specific, such as HOST_RESET.
         */
        tmp = readl(mmio + HOST_CTL);
-       if (!(tmp & HOST_AHCI_EN))
-               writel(tmp | HOST_AHCI_EN, mmio + HOST_CTL);
+       if (!(tmp & HOST_AHCI_EN)) {
+               tmp |= HOST_AHCI_EN;
+               writel(tmp, mmio + HOST_CTL);
+       }
 
        /* global controller reset */
        if ((tmp & HOST_RESET) == 0) {