Commit c76ef96f authored by Pavankumar Kondeti's avatar Pavankumar Kondeti Committed by Greg Kroah-Hartman

usb: gadget: f_fs: Use stream_open() for endpoint files

Function fs endpoint file operations are synchronized via an interruptible
mutex wait. However we see threads that do ep file operations concurrently
are getting blocked for the mutex lock in __fdget_pos(). This is an
uninterruptible wait and we see hung task warnings and kernel panic
if hung_task_panic systcl is enabled if host does not send/receive
the data for long time.

The reason for threads getting blocked in __fdget_pos() is due to
the file position protection introduced by the commit 9c225f26
("vfs: atomic f_pos accesses as per POSIX"). Since function fs
endpoint files does not have the notion of the file position, switch
to the stream mode. This will bypass the file position mutex and
threads will be blocked in interruptible state for the function fs
mutex.

It should not affects user space as we are only changing the task state
changes the task state from UNINTERRUPTIBLE to INTERRUPTIBLE while waiting
for the USB transfers to be finished. However there is a slight change to
the O_NONBLOCK behavior. Earlier threads that are using O_NONBLOCK are also
getting blocked inside fdget_pos(). Now they reach to function fs and error
code is returned. The non blocking behavior is actually honoured now.
Reviewed-by: default avatarJohn Keeping <john@metanate.com>
Signed-off-by: default avatarPavankumar Kondeti <quic_pkondeti@quicinc.com>
Link: https://lore.kernel.org/r/1636712682-1226-1-git-send-email-quic_pkondeti@quicinc.comSigned-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 9933698f
......@@ -614,7 +614,7 @@ static int ffs_ep0_open(struct inode *inode, struct file *file)
file->private_data = ffs;
ffs_data_opened(ffs);
return 0;
return stream_open(inode, file);
}
static int ffs_ep0_release(struct inode *inode, struct file *file)
......@@ -1154,7 +1154,7 @@ ffs_epfile_open(struct inode *inode, struct file *file)
file->private_data = epfile;
ffs_data_opened(epfile->ffs);
return 0;
return stream_open(inode, file);
}
static int ffs_aio_cancel(struct kiocb *kiocb)
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment