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[linux,dev-5.10,14/14] fsi: sbefifo: Use interruptible mutex locking

Message ID 20210811154232.12649-15-eajames@linux.ibm.com
State New
Headers show
Series Rainier and Everest system fixes | expand

Commit Message

Eddie James Aug. 11, 2021, 3:42 p.m. UTC 
Some SBE operations have extremely large responses and can require
several minutes to process the response. During this time, the device
lock must be held. If another process attempts an operation, it will
wait for the mutex for longer than the kernel hung task watchdog
allows. Therefore, use the interruptible function to lock the mutex.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
 drivers/fsi/fsi-sbefifo.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)
diff mbox series

Patch

diff --git a/drivers/fsi/fsi-sbefifo.c b/drivers/fsi/fsi-sbefifo.c
index 8645a092af89..060a790989f9 100644
--- a/drivers/fsi/fsi-sbefifo.c
+++ b/drivers/fsi/fsi-sbefifo.c
@@ -740,7 +740,9 @@  int sbefifo_submit(struct device *dev, const __be32 *command, size_t cmd_len,
         iov_iter_kvec(&resp_iter, WRITE, &resp_iov, 1, rbytes);
 
 	/* Perform the command */
-	mutex_lock(&sbefifo->lock);
+	rc = mutex_lock_interruptible(&sbefifo->lock);
+	if (rc)
+		return rc;
 	rc = __sbefifo_submit(sbefifo, command, cmd_len, &resp_iter);
 	mutex_unlock(&sbefifo->lock);
 
@@ -820,7 +822,9 @@  static ssize_t sbefifo_user_read(struct file *file, char __user *buf,
 	iov_iter_init(&resp_iter, WRITE, &resp_iov, 1, len);
 
 	/* Perform the command */
-	mutex_lock(&sbefifo->lock);
+	rc = mutex_lock_interruptible(&sbefifo->lock);
+	if (rc)
+		goto bail;
 	rc = __sbefifo_submit(sbefifo, user->pending_cmd, cmd_len, &resp_iter);
 	mutex_unlock(&sbefifo->lock);
 	if (rc < 0)
@@ -875,7 +879,9 @@  static ssize_t sbefifo_user_write(struct file *file, const char __user *buf,
 		user->pending_len = 0;
 
 		/* Trigger reset request */
-		mutex_lock(&sbefifo->lock);
+		rc = mutex_lock_interruptible(&sbefifo->lock);
+		if (rc)
+			goto bail;
 		rc = sbefifo_request_reset(user->sbefifo);
 		mutex_unlock(&sbefifo->lock);
 		if (rc == 0)