diff options
author | Heiner Kallweit <hkallweit1@gmail.com> | 2021-05-22 00:02:43 +0200 |
---|---|---|
committer | Wolfram Sang <wsa@kernel.org> | 2021-05-27 22:09:16 +0200 |
commit | 1de93d5d521717cbb77cc9796a4df141d800d608 (patch) | |
tree | 48af193b5fd2a231ad0809f89736a0fbff81392f | |
parent | 78f420acc4231f7db99291d846bc73d5f8a8df72 (diff) | |
download | linux-1de93d5d521717cbb77cc9796a4df141d800d608.tar.bz2 |
i2c: i801: Replace waitqueue with completion API
Using the completion API is more intuitive and it allows to simplify
the code. Note that we don't have to set priv->status = 0 any longer
with the completion API.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Tested-by: Jean Delvare <jdelvare@suse.de>
Reviewed-by: Daniel Kurtz <djkurtz@chromium.org>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
-rw-r--r-- | drivers/i2c/busses/i2c-i801.c | 48 |
1 files changed, 19 insertions, 29 deletions
diff --git a/drivers/i2c/busses/i2c-i801.c b/drivers/i2c/busses/i2c-i801.c index bfea94d02775..738204d7726d 100644 --- a/drivers/i2c/busses/i2c-i801.c +++ b/drivers/i2c/busses/i2c-i801.c @@ -103,7 +103,7 @@ #include <linux/dmi.h> #include <linux/slab.h> #include <linux/string.h> -#include <linux/wait.h> +#include <linux/completion.h> #include <linux/err.h> #include <linux/platform_device.h> #include <linux/platform_data/itco_wdt.h> @@ -270,7 +270,7 @@ struct i801_priv { unsigned int features; /* isr processing */ - wait_queue_head_t waitq; + struct completion done; u8 status; /* Command state used by isr for byte-by-byte block transactions */ @@ -496,24 +496,19 @@ static int i801_wait_byte_done(struct i801_priv *priv) static int i801_transaction(struct i801_priv *priv, int xact) { int status; - int result; + unsigned long result; const struct i2c_adapter *adap = &priv->adapter; - result = i801_check_pre(priv); - if (result < 0) - return result; + status = i801_check_pre(priv); + if (status < 0) + return status; if (priv->features & FEATURE_IRQ) { + reinit_completion(&priv->done); outb_p(xact | SMBHSTCNT_INTREN | SMBHSTCNT_START, SMBHSTCNT(priv)); - result = wait_event_timeout(priv->waitq, - (status = priv->status), - adap->timeout); - if (!result) - status = -ETIMEDOUT; - - priv->status = 0; - return i801_check_post(priv, status); + result = wait_for_completion_timeout(&priv->done, adap->timeout); + return i801_check_post(priv, result ? priv->status : -ETIMEDOUT); } /* the current contents of SMBHSTCNT can be overwritten, since PEC, @@ -638,7 +633,7 @@ static irqreturn_t i801_host_notify_isr(struct i801_priv *priv) * DEV_ERR - Invalid command, NAK or communication timeout * BUS_ERR - SMI# transaction collision * FAILED - transaction was canceled due to a KILL request - * When any of these occur, update ->status and wake up the waitq. + * When any of these occur, update ->status and signal completion. * ->status must be cleared before kicking off the next transaction. * * 2) For byte-by-byte (I2C read/write) transactions, one BYTE_DONE interrupt @@ -675,7 +670,7 @@ static irqreturn_t i801_isr(int irq, void *dev_id) if (status) { outb_p(status, SMBHSTSTS(priv)); priv->status = status; - wake_up(&priv->waitq); + complete(&priv->done); } return IRQ_HANDLED; @@ -694,15 +689,15 @@ static int i801_block_transaction_byte_by_byte(struct i801_priv *priv, int i, len; int smbcmd; int status; - int result; + unsigned long result; const struct i2c_adapter *adap = &priv->adapter; if (command == I2C_SMBUS_BLOCK_PROC_CALL) return -EOPNOTSUPP; - result = i801_check_pre(priv); - if (result < 0) - return result; + status = i801_check_pre(priv); + if (status < 0) + return status; len = data->block[0]; @@ -726,15 +721,10 @@ static int i801_block_transaction_byte_by_byte(struct i801_priv *priv, priv->count = 0; priv->data = &data->block[1]; + reinit_completion(&priv->done); outb_p(priv->cmd | SMBHSTCNT_START, SMBHSTCNT(priv)); - result = wait_event_timeout(priv->waitq, - (status = priv->status), - adap->timeout); - if (!result) - status = -ETIMEDOUT; - - priv->status = 0; - return i801_check_post(priv, status); + result = wait_for_completion_timeout(&priv->done, adap->timeout); + return i801_check_post(priv, result ? priv->status : -ETIMEDOUT); } for (i = 1; i <= len; i++) { @@ -1889,7 +1879,7 @@ static int i801_probe(struct pci_dev *dev, const struct pci_device_id *id) } if (priv->features & FEATURE_IRQ) { - init_waitqueue_head(&priv->waitq); + init_completion(&priv->done); err = devm_request_irq(&dev->dev, dev->irq, i801_isr, IRQF_SHARED, |