diff options
| author |  Eddie James <eajames@linux.ibm.com>
| 2021-08-03 16:30:16 -0500 |
|---|---|---|
| committer |  Joel Stanley <joel@jms.id.au>
| 2021-10-22 09:54:33 +1030 |
| commit | 7cc2f34e1f4da07c791737cc6b3d965b31815ea0 (patch) | |
| tree | e50403dda50eb75d40fe454ede2b88377c76be51 /drivers/fsi | |
| parent | fsi: sbefifo: Add sysfs file indicating a timeout error (diff) | |
| download | linux-7cc2f34e1f4da07c791737cc6b3d965b31815ea0.tar.gz linux-7cc2f34e1f4da07c791737cc6b3d965b31815ea0.tar.bz2 linux-7cc2f34e1f4da07c791737cc6b3d965b31815ea0.zip | |
fsi: sbefifo: Use interruptible mutex locking
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>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Link: https://lore.kernel.org/r/20210803213016.44739-1-eajames@linux.ibm.com
Signed-off-by: Joel Stanley <joel@jms.id.au>
Diffstat (limited to 'drivers/fsi')
| -rw-r--r-- | drivers/fsi/fsi-sbefifo.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/drivers/fsi/fsi-sbefifo.c b/drivers/fsi/fsi-sbefifo.c index b414ab4431ef..52328adef643 100644 --- a/drivers/fsi/fsi-sbefifo.c +++ b/drivers/fsi/fsi-sbefifo.c @@ -752,7 +752,9 @@ 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); @@ -832,7 +834,9 @@ 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) @@ -887,7 +891,9 @@ 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) |