linux-kernel - [RFC PATCH 10/17] hwmon: Drop uses of pci_read_config

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Date:   Sat,  1 Aug 2020 13:24:39 +0200
From:   "Saheed O. Bolarinwa" <refactormyself@...il.com>
To:     helgaas@...nel.org, Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>
Cc:     "Saheed O. Bolarinwa" <refactormyself@...il.com>,
        bjorn@...gaas.com, skhan@...uxfoundation.org,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-hwmon@...r.kernel.org
Subject: [RFC PATCH 10/17] hwmon: Drop uses of pci_read_config_*() return value

The return value of pci_read_config_*() may not indicate a device error.
However, the value read by these functions is more likely to indicate
this kind of error. This presents two overlapping ways of reporting
errors and complicates error checking.

It is possible to move to one single way of checking for error if the
dependency on the return value of these functions is removed, then it
can later be made to return void.

Remove all uses of the return value of pci_read_config_*().
Check the actual value read for ~0. In this case, ~0 is an invalid
value thus it indicates some kind of error.

Suggested-by: Bjorn Helgaas <bjorn@...gaas.com>
Signed-off-by: Saheed O. Bolarinwa <refactormyself@...il.com>
---
 drivers/hwmon/i5k_amb.c | 12 ++++++++----
 drivers/hwmon/vt8231.c  |  8 ++++----
 2 files changed, 12 insertions(+), 8 deletions(-)

diff --git a/drivers/hwmon/i5k_amb.c b/drivers/hwmon/i5k_amb.c
index eeac4b04df27..b7497510323c 100644
--- a/drivers/hwmon/i5k_amb.c
+++ b/drivers/hwmon/i5k_amb.c
@@ -427,11 +427,13 @@ static int i5k_find_amb_registers(struct i5k_amb_data *data,
 	if (!pcidev)
 		return -ENODEV;
 
-	if (pci_read_config_dword(pcidev, I5K_REG_AMB_BASE_ADDR, &val32))
+	pci_read_config_dword(pcidev, I5K_REG_AMB_BASE_ADDR, &val32);
+	if (val32 == (u32)~0)
 		goto out;
 	data->amb_base = val32;
 
-	if (pci_read_config_dword(pcidev, I5K_REG_AMB_LEN_ADDR, &val32))
+	pci_read_config_dword(pcidev, I5K_REG_AMB_LEN_ADDR, &val32);
+	if (val32 == (u32)~0)
 		goto out;
 	data->amb_len = val32;
 
@@ -458,11 +460,13 @@ static int i5k_channel_probe(u16 *amb_present, unsigned long dev_id)
 	if (!pcidev)
 		return -ENODEV;
 
-	if (pci_read_config_word(pcidev, I5K_REG_CHAN0_PRESENCE_ADDR, &val16))
+	pci_read_config_word(pcidev, I5K_REG_CHAN0_PRESENCE_ADDR, &val16);
+	if (val16 == (u16)~0)
 		goto out;
 	amb_present[0] = val16;
 
-	if (pci_read_config_word(pcidev, I5K_REG_CHAN1_PRESENCE_ADDR, &val16))
+	pci_read_config_word(pcidev, I5K_REG_CHAN1_PRESENCE_ADDR, &val16);
+	if (val16 == (u16)~0)
 		goto out;
 	amb_present[1] = val16;
 
diff --git a/drivers/hwmon/vt8231.c b/drivers/hwmon/vt8231.c
index 2335d440f72d..6603727e15a0 100644
--- a/drivers/hwmon/vt8231.c
+++ b/drivers/hwmon/vt8231.c
@@ -992,8 +992,8 @@ static int vt8231_pci_probe(struct pci_dev *dev,
 			return -ENODEV;
 	}
 
-	if (PCIBIOS_SUCCESSFUL != pci_read_config_word(dev, VT8231_BASE_REG,
-							&val))
+	pci_read_config_word(dev, VT8231_BASE_REG, &val);
+	if (val == (u16)~0)
 		return -ENODEV;
 
 	address = val & ~(VT8231_EXTENT - 1);
@@ -1002,8 +1002,8 @@ static int vt8231_pci_probe(struct pci_dev *dev,
 		return -ENODEV;
 	}
 
-	if (PCIBIOS_SUCCESSFUL != pci_read_config_word(dev, VT8231_ENABLE_REG,
-							&val))
+	pci_read_config_word(dev, VT8231_ENABLE_REG, &val);
+	if (val == (u16)~0)
 		return -ENODEV;
 
 	if (!(val & 0x0001)) {
-- 
2.18.4