ahci: remove pmp link online check in FBS EH

ata_link_online() check in ahci_error_intr() is unnecessary, it should
be removed otherwise may lead to lockup with FBS enabled PMP.
http://marc.info/?l=linux-ide&m=137050421603272&w=2

Reported-by: Yu Liu <liuyu.ac@gmail.com>
Signed-off-by: Shane Huang <shane.huang@amd.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: stable@vger.kernel.org

diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c
index a70ff15..7b9bdd8 100644 (file)
--- a/drivers/ata/libahci.c
+++ b/drivers/ata/libahci.c
@@ -1560,8 +1560,7 @@ static void ahci_error_intr(struct ata_port *ap, u32 irq_stat)
                u32 fbs = readl(port_mmio + PORT_FBS);
                int pmp = fbs >> PORT_FBS_DWE_OFFSET;
 
-               if ((fbs & PORT_FBS_SDE) && (pmp < ap->nr_pmp_links) &&
-                   ata_link_online(&ap->pmp_link[pmp])) {
+               if ((fbs & PORT_FBS_SDE) && (pmp < ap->nr_pmp_links)) {
                        link = &ap->pmp_link[pmp];
                        fbs_need_dec = true;
                }