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Message-Id: <20170403075133.12343-3-zboszor@pr.hu>
Date: Mon, 3 Apr 2017 09:51:32 +0200
From: Zoltan Boszormenyi <zboszor@...hu>
To: linux-usb@...r.kernel.org, linux-watchdog@...r.kernel.org,
linux-i2c@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
Paul Menzel <paulepanter@...rs.sourceforge.net>,
Christian Fetzer <fetzer.ch@...il.com>,
Jean Delvare <jdelvare@...e.com>,
Nehal Shah <nehal-bakulchandra.shah@....com>,
Tim Small <tim@...ss.co.uk>,
Guenter Roeck <linux@...ck-us.net>,
Zoltan Boszormenyi <zboszor@...hu>
Subject: [PATCH 2/3 v2] i2c: i2c-piix4: Use the common mutex
Use the common mutex from driver/usb/host/pci-quirks.c in the
i2c-piix4 driver to synchronize access to the I/O port pair
0xcd6 / 0xcd7.
At the same time, remove the request_region() call to reserve
these I/O ports, so the sp5100_tco watchdog driver can also
load. The mutex is enough to protect the I/O port accesses.
This is an old regression in Linux 4.4-rc4, caused by:
v2: Explicit extern reference for sb800_mutex
commit 2fee61d22e606fc99ade9079fda15fdee83ec33e
Author: Christian Fetzer <fetzer.ch@...il.com>
Date: Thu Nov 19 20:13:48 2015 +0100
i2c: piix4: Add support for multiplexed main adapter in SB800
Signed-off-by: Zoltan Boszormenyi <zboszor@...hu>
---
drivers/i2c/busses/i2c-piix4.c | 43 +++++++++++++-----------------------------
1 file changed, 13 insertions(+), 30 deletions(-)
diff --git a/drivers/i2c/busses/i2c-piix4.c b/drivers/i2c/busses/i2c-piix4.c
index c21ca7b..6c56e96 100644
--- a/drivers/i2c/busses/i2c-piix4.c
+++ b/drivers/i2c/busses/i2c-piix4.c
@@ -144,10 +144,10 @@ static const struct dmi_system_id piix4_dmi_ibm[] = {
/*
* SB800 globals
- * piix4_mutex_sb800 protects piix4_port_sel_sb800 and the pair
- * of I/O ports at SB800_PIIX4_SMB_IDX.
+ * sb800_mutex in drivers/usb/host/pci-quirks.c protects
+ * piix4_port_sel_sb800 and the pair of I/O ports at SB800_PIIX4_SMB_IDX.
*/
-static DEFINE_MUTEX(piix4_mutex_sb800);
+extern struct mutex sb800_mutex;
static u8 piix4_port_sel_sb800;
static const char *piix4_main_port_names_sb800[PIIX4_MAX_ADAPTERS] = {
" port 0", " port 2", " port 3", " port 4"
@@ -157,8 +157,6 @@ static const char *piix4_aux_port_name_sb800 = " port 1";
struct i2c_piix4_adapdata {
unsigned short smba;
- /* SB800 */
- bool sb800_main;
u8 port; /* Port number, shifted */
};
@@ -286,12 +284,12 @@ static int piix4_setup_sb800(struct pci_dev *PIIX4_dev,
else
smb_en = (aux) ? 0x28 : 0x2c;
- mutex_lock(&piix4_mutex_sb800);
+ mutex_lock(&sb800_mutex);
outb_p(smb_en, SB800_PIIX4_SMB_IDX);
smba_en_lo = inb_p(SB800_PIIX4_SMB_IDX + 1);
outb_p(smb_en + 1, SB800_PIIX4_SMB_IDX);
smba_en_hi = inb_p(SB800_PIIX4_SMB_IDX + 1);
- mutex_unlock(&piix4_mutex_sb800);
+ mutex_unlock(&sb800_mutex);
if (!smb_en) {
smb_en_status = smba_en_lo & 0x10;
@@ -349,13 +347,13 @@ static int piix4_setup_sb800(struct pci_dev *PIIX4_dev,
if (PIIX4_dev->vendor == PCI_VENDOR_ID_AMD) {
piix4_port_sel_sb800 = SB800_PIIX4_PORT_IDX_ALT;
} else {
- mutex_lock(&piix4_mutex_sb800);
+ mutex_lock(&sb800_mutex);
outb_p(SB800_PIIX4_PORT_IDX_SEL, SB800_PIIX4_SMB_IDX);
port_sel = inb_p(SB800_PIIX4_SMB_IDX + 1);
piix4_port_sel_sb800 = (port_sel & 0x01) ?
SB800_PIIX4_PORT_IDX_ALT :
SB800_PIIX4_PORT_IDX;
- mutex_unlock(&piix4_mutex_sb800);
+ mutex_unlock(&sb800_mutex);
}
dev_info(&PIIX4_dev->dev,
@@ -592,7 +590,7 @@ static s32 piix4_access_sb800(struct i2c_adapter *adap, u16 addr,
u8 port;
int retval;
- mutex_lock(&piix4_mutex_sb800);
+ mutex_lock(&sb800_mutex);
/* Request the SMBUS semaphore, avoid conflicts with the IMC */
smbslvcnt = inb_p(SMBSLVCNT);
@@ -608,7 +606,7 @@ static s32 piix4_access_sb800(struct i2c_adapter *adap, u16 addr,
} while (--retries);
/* SMBus is still owned by the IMC, we give up */
if (!retries) {
- mutex_unlock(&piix4_mutex_sb800);
+ mutex_unlock(&sb800_mutex);
return -EBUSY;
}
@@ -628,7 +626,7 @@ static s32 piix4_access_sb800(struct i2c_adapter *adap, u16 addr,
/* Release the semaphore */
outb_p(smbslvcnt | 0x20, SMBSLVCNT);
- mutex_unlock(&piix4_mutex_sb800);
+ mutex_unlock(&sb800_mutex);
return retval;
}
@@ -705,7 +703,6 @@ static int piix4_add_adapter(struct pci_dev *dev, unsigned short smba,
}
adapdata->smba = smba;
- adapdata->sb800_main = sb800_main;
adapdata->port = port << 1;
/* set up the sysfs linkage to our parent device */
@@ -771,29 +768,18 @@ static int piix4_probe(struct pci_dev *dev, const struct pci_device_id *id)
dev->vendor == PCI_VENDOR_ID_AMD) {
is_sb800 = true;
- if (!request_region(SB800_PIIX4_SMB_IDX, 2, "smba_idx")) {
- dev_err(&dev->dev,
- "SMBus base address index region 0x%x already in use!\n",
- SB800_PIIX4_SMB_IDX);
- return -EBUSY;
- }
-
/* base address location etc changed in SB800 */
retval = piix4_setup_sb800(dev, id, 0);
- if (retval < 0) {
- release_region(SB800_PIIX4_SMB_IDX, 2);
+ if (retval < 0)
return retval;
- }
/*
* Try to register multiplexed main SMBus adapter,
* give up if we can't
*/
retval = piix4_add_adapters_sb800(dev, retval);
- if (retval < 0) {
- release_region(SB800_PIIX4_SMB_IDX, 2);
+ if (retval < 0)
return retval;
- }
} else {
retval = piix4_setup(dev, id);
if (retval < 0)
@@ -841,11 +827,8 @@ static void piix4_adap_remove(struct i2c_adapter *adap)
if (adapdata->smba) {
i2c_del_adapter(adap);
- if (adapdata->port == (0 << 1)) {
+ if (adapdata->port == (0 << 1))
release_region(adapdata->smba, SMBIOSIZE);
- if (adapdata->sb800_main)
- release_region(SB800_PIIX4_SMB_IDX, 2);
- }
kfree(adapdata);
kfree(adap);
}
--
2.9.3
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