From 88a997871e9fbe6e358e0d0cb7e001cef388c32e Mon Sep 17 00:00:00 2001
From: Alexander Richards <electrodeyt@gmail.com>
Date: Sat, 15 May 2021 19:45:23 +0200
Subject: [PATCH] AHCIController: Fix off-by-one mistake (#7144)

Fixes off-by-one caused by reading the register directly
without adding a 1 to it, because AHCI reports 1 less port than
the actual number of ports supported.
---
 Kernel/Storage/AHCIController.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Kernel/Storage/AHCIController.cpp b/Kernel/Storage/AHCIController.cpp
index 50413ca6c4..78a2aa3386 100644
--- a/Kernel/Storage/AHCIController.cpp
+++ b/Kernel/Storage/AHCIController.cpp
@@ -183,7 +183,7 @@ RefPtr<StorageDevice> AHCIController::device_by_port(u32 port_index) const
 RefPtr<StorageDevice> AHCIController::device(u32 index) const
 {
     NonnullRefPtrVector<StorageDevice> connected_devices;
-    for (size_t index = 0; index < (size_t)(hba().control_regs.cap & 0x1F); index++) {
+    for (size_t index = 0; index < capabilities().ports_count; index++) {
         auto checked_device = device_by_port(index);
         if (checked_device.is_null())
             continue;