tegra-ahci: Fix potential null ptr dereference.

Condition to check ptr being non-null before use.

This fix coverity issue: 9820675

Bug 200741055

Change-Id: I815d79fa899437c0bf24dc96505470b23b7990c1
Signed-off-by: Achal Verma <achalv@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvidia/+/2515237
Reviewed-by: svcacv <svcacv@nvidia.com>
Reviewed-by: Dmitry Pervushin <dpervushin@nvidia.com>
Reviewed-by: Rahul Jain (SW-TEGRA) <rahuljain@nvidia.com>
GVS: Gerrit_Virtual_Submit
(cherry picked from commit 940245b31a1569cb4d1227b86a51b2f366714135)
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvidia/+/2574549
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
Reviewed-by: Phoenix Jung <pjung@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 5 insertions, 3 deletions

diff --git a/drivers/ata/tegra/ahci_tegra.c b/drivers/ata/tegra/ahci_tegra.c
index aa9cdde9e..cd2602a59 100644
--- a/drivers/ata/tegra/ahci_tegra.c
+++ b/drivers/ata/tegra/ahci_tegra.c
@@ -1,7 +1,7 @@
 /*
  * drivers/ata/ahci_tegra.c
  *
- * Copyright (c) 2016-2019, NVIDIA CORPORATION.  All rights reserved.
+ * Copyright (c) 2016-2021, NVIDIA CORPORATION.  All rights reserved.
  *
  * This software is licensed under the terms of the GNU General Public
  * License version 2, as published by the Free Software Foundation, and
@@ -569,9 +569,11 @@ static void tegra_ahci_unbind(struct work_struct *work)
                 struct ata_port *ap = host->ports[i];
                 unsigned long flags;
 
+                if (!ap)
+                        continue;
                 spin_lock_irqsave(ap->lock, flags);
-                if (ap && ((ap->pflags & ATA_PFLAG_LOADING) ||
-                                        (ap->pflags & ATA_PFLAG_INITIALIZING))) {
+                if ((ap->pflags & ATA_PFLAG_LOADING) ||
+                                        (ap->pflags & ATA_PFLAG_INITIALIZING)) {
                         INIT_DELAYED_WORK(&tegra->work, tegra_ahci_unbind);
                         schedule_delayed_work(&tegra->work, msecs_to_jiffies(1000));
                         spin_unlock_irqrestore(ap->lock, flags);