Merge tag 'hwmon-for-v6.9-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging
Pull hwmon fixes from Guenter Roeck:
- pmbus/ucd9000: Increase chip access delay to avoid random access
errors
- corsair-cpro: Protect kernel code against parallel hidraw access from
userspace
* tag 'hwmon-for-v6.9-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging:
hwmon: (pmbus/ucd9000) Increase delay from 250 to 500us
hwmon: (corsair-cpro) Protect ccp->wait_input_report with a spinlock
hwmon: (corsair-cpro) Use complete_all() instead of complete() in ccp_raw_event()
hwmon: (corsair-cpro) Use a separate buffer for sending commands
diff --git a/drivers/hwmon/corsair-cpro.c b/drivers/hwmon/corsair-cpro.c
index a284a02..3e63666 100644
--- a/drivers/hwmon/corsair-cpro.c
+++ b/drivers/hwmon/corsair-cpro.c
@@ -16,6 +16,7 @@
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/slab.h>
+#include <linux/spinlock.h>
#include <linux/types.h>
#define USB_VENDOR_ID_CORSAIR 0x1b1c
@@ -77,8 +78,11 @@
struct ccp_device {
struct hid_device *hdev;
struct device *hwmon_dev;
+ /* For reinitializing the completion below */
+ spinlock_t wait_input_report_lock;
struct completion wait_input_report;
struct mutex mutex; /* whenever buffer is used, lock before send_usb_cmd */
+ u8 *cmd_buffer;
u8 *buffer;
int target[6];
DECLARE_BITMAP(temp_cnct, NUM_TEMP_SENSORS);
@@ -111,15 +115,23 @@ static int send_usb_cmd(struct ccp_device *ccp, u8 command, u8 byte1, u8 byte2,
unsigned long t;
int ret;
- memset(ccp->buffer, 0x00, OUT_BUFFER_SIZE);
- ccp->buffer[0] = command;
- ccp->buffer[1] = byte1;
- ccp->buffer[2] = byte2;
- ccp->buffer[3] = byte3;
+ memset(ccp->cmd_buffer, 0x00, OUT_BUFFER_SIZE);
+ ccp->cmd_buffer[0] = command;
+ ccp->cmd_buffer[1] = byte1;
+ ccp->cmd_buffer[2] = byte2;
+ ccp->cmd_buffer[3] = byte3;
+ /*
+ * Disable raw event parsing for a moment to safely reinitialize the
+ * completion. Reinit is done because hidraw could have triggered
+ * the raw event parsing and marked the ccp->wait_input_report
+ * completion as done.
+ */
+ spin_lock_bh(&ccp->wait_input_report_lock);
reinit_completion(&ccp->wait_input_report);
+ spin_unlock_bh(&ccp->wait_input_report_lock);
- ret = hid_hw_output_report(ccp->hdev, ccp->buffer, OUT_BUFFER_SIZE);
+ ret = hid_hw_output_report(ccp->hdev, ccp->cmd_buffer, OUT_BUFFER_SIZE);
if (ret < 0)
return ret;
@@ -135,11 +147,12 @@ static int ccp_raw_event(struct hid_device *hdev, struct hid_report *report, u8
struct ccp_device *ccp = hid_get_drvdata(hdev);
/* only copy buffer when requested */
- if (completion_done(&ccp->wait_input_report))
- return 0;
-
- memcpy(ccp->buffer, data, min(IN_BUFFER_SIZE, size));
- complete(&ccp->wait_input_report);
+ spin_lock(&ccp->wait_input_report_lock);
+ if (!completion_done(&ccp->wait_input_report)) {
+ memcpy(ccp->buffer, data, min(IN_BUFFER_SIZE, size));
+ complete_all(&ccp->wait_input_report);
+ }
+ spin_unlock(&ccp->wait_input_report_lock);
return 0;
}
@@ -492,7 +505,11 @@ static int ccp_probe(struct hid_device *hdev, const struct hid_device_id *id)
if (!ccp)
return -ENOMEM;
- ccp->buffer = devm_kmalloc(&hdev->dev, OUT_BUFFER_SIZE, GFP_KERNEL);
+ ccp->cmd_buffer = devm_kmalloc(&hdev->dev, OUT_BUFFER_SIZE, GFP_KERNEL);
+ if (!ccp->cmd_buffer)
+ return -ENOMEM;
+
+ ccp->buffer = devm_kmalloc(&hdev->dev, IN_BUFFER_SIZE, GFP_KERNEL);
if (!ccp->buffer)
return -ENOMEM;
@@ -510,7 +527,9 @@ static int ccp_probe(struct hid_device *hdev, const struct hid_device_id *id)
ccp->hdev = hdev;
hid_set_drvdata(hdev, ccp);
+
mutex_init(&ccp->mutex);
+ spin_lock_init(&ccp->wait_input_report_lock);
init_completion(&ccp->wait_input_report);
hid_device_io_start(hdev);
diff --git a/drivers/hwmon/pmbus/ucd9000.c b/drivers/hwmon/pmbus/ucd9000.c
index 8d9d422..d817c71 100644
--- a/drivers/hwmon/pmbus/ucd9000.c
+++ b/drivers/hwmon/pmbus/ucd9000.c
@@ -80,11 +80,11 @@ struct ucd9000_debugfs_entry {
* It has been observed that the UCD90320 randomly fails register access when
* doing another access right on the back of a register write. To mitigate this
* make sure that there is a minimum delay between a write access and the
- * following access. The 250us is based on experimental data. At a delay of
- * 200us the issue seems to go away. Add a bit of extra margin to allow for
+ * following access. The 500 is based on experimental data. At a delay of
+ * 350us the issue seems to go away. Add a bit of extra margin to allow for
* system to system differences.
*/
-#define UCD90320_WAIT_DELAY_US 250
+#define UCD90320_WAIT_DELAY_US 500
static inline void ucd90320_wait(const struct ucd9000_data *data)
{
