linux-kernel - [PATCH 2/3] ath10k: don't assume this is a PCI dev in generic code

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Message-Id: <20181102171749.38680-2-briannorris@chromium.org>
Date:   Fri,  2 Nov 2018 10:17:48 -0700
From:   Brian Norris <briannorris@...omium.org>
To:     ath10k@...ts.infradead.org
Cc:     linux-wireless@...r.kernel.org,
        Rakesh Pillai <pillair@....qualcomm.com>,
        Govind Singh <govinds@....qualcomm.com>,
        <linux-kernel@...r.kernel.org>,
        Brian Norris <briannorris@...omium.org>
Subject: [PATCH 2/3] ath10k: don't assume this is a PCI dev in generic code

Not all devices using this driver are backed by a PCI device, so it's
not fair to assume 'to_pci_dev()' is valid. Fortunately, we only were
using this to convert straight back to a bare 'device', which means we
were only doing no-op pointer arithmetic, and not actually accessing
potentially out-of-bounds memory. But this is still bad practice.

Just use 'ar->dev' directly, since that's really all we're looking for.

Fixes: 209b2a68de76 ("ath10k: add platform regulatory domain support")
Signed-off-by: Brian Norris <briannorris@...omium.org>
---
 drivers/net/wireless/ath/ath10k/mac.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/net/wireless/ath/ath10k/mac.c b/drivers/net/wireless/ath/ath10k/mac.c
index a1c2801ded10..5c4ee66382d9 100644
--- a/drivers/net/wireless/ath/ath10k/mac.c
+++ b/drivers/net/wireless/ath/ath10k/mac.c
@@ -8313,7 +8313,6 @@ static u32 ath10k_mac_wrdd_get_mcc(struct ath10k *ar, union acpi_object *wrdd)
 
 static int ath10k_mac_get_wrdd_regulatory(struct ath10k *ar, u16 *rd)
 {
-	struct pci_dev __maybe_unused *pdev = to_pci_dev(ar->dev);
 	acpi_handle root_handle;
 	acpi_handle handle;
 	struct acpi_buffer wrdd = {ACPI_ALLOCATE_BUFFER, NULL};
@@ -8321,7 +8320,7 @@ static int ath10k_mac_get_wrdd_regulatory(struct ath10k *ar, u16 *rd)
 	u32 alpha2_code;
 	char alpha2[3];
 
-	root_handle = ACPI_HANDLE(&pdev->dev);
+	root_handle = ACPI_HANDLE(ar->dev);
 	if (!root_handle)
 		return -EOPNOTSUPP;
 
-- 
2.19.1.930.g4563a0d9d0-goog