linux-kernel - [PATCH 4.4 12/72] ACPI, PCI, irq: remove redundant check for null string pointer

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Message-Id: <20180406084306.075727193@linuxfoundation.org>
Date:   Fri,  6 Apr 2018 15:23:13 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Colin Ian King <colin.king@...onical.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Nathan Chancellor <natechancellor@...il.com>
Subject: [PATCH 4.4 12/72] ACPI, PCI, irq: remove redundant check for null string pointer

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Colin Ian King <colin.king@...onical.com>

commit 45288978859119c019eff93f0cb838a0de100bcc upstream.

source is decleared as a 4 byte char array in struct acpi_pci_routing_table
so !prt->source is a redundant null string pointer check. Detected with
smatch:

drivers/acpi/pci_irq.c:134 do_prt_fixups() warn: this array is probably
  non-NULL. 'prt->source'

Signed-off-by: Colin Ian King <colin.king@...onical.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Cc: Nathan Chancellor <natechancellor@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/acpi/pci_irq.c |    3 ---
 1 file changed, 3 deletions(-)

--- a/drivers/acpi/pci_irq.c
+++ b/drivers/acpi/pci_irq.c
@@ -131,9 +131,6 @@ static void do_prt_fixups(struct acpi_pr
 		quirk = &prt_quirks[i];

 		/* All current quirks involve link devices, not GSIs */
-		if (!prt->source)
-			continue;
-
 		if (dmi_check_system(quirk->system) &&
 		    entry->id.segment == quirk->segment &&
 		    entry->id.bus == quirk->bus &&