Messages in this thread | | | Date | Wed, 13 Jul 2022 17:34:37 +0200 | From | Greg KH <> | Subject | Re: [PATCH] misc: hpilo: switch .{read,write} ops to .{read,write}_iter |
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On Wed, Jul 13, 2022 at 11:08:31PM +0800, matt.hsiao@hpe.com wrote: > From: Matt Hsiao <matt.hsiao@hpe.com> > > Commit 4d03e3cc59828c82ee89 ("fs: don't allow kernel reads and writes > without iter ops") requested exclusive .{read,write}_iter ops for > kernel_{read,write}. To support dependent drivers to access hpilo by > kernel_{read,write}, switch .{read,write} ops to its iter variants. > > Signed-off-by: Matt Hsiao <matt.hsiao@hpe.com> > --- > hpilo.c | 31 ++++++++++++++++++------------- > 1 file changed, 18 insertions(+), 13 deletions(-) > > diff --git a/hpilo.c b/hpilo.c > index 8d00df9..5d431a5 100644 > --- a/hpilo.c > +++ b/hpilo.c > @@ -23,6 +23,7 @@ > #include <linux/wait.h> > #include <linux/poll.h> > #include <linux/slab.h> > +#include <linux/uio.h> > #include "hpilo.h" > > static struct class *ilo_class; > @@ -435,14 +436,14 @@ static void ilo_set_reset(struct ilo_hwinfo *hw) > } > } > > -static ssize_t ilo_read(struct file *fp, char __user *buf, > - size_t len, loff_t *off) > +static ssize_t ilo_read_iter(struct kiocb *iocb, struct iov_iter *to) > { > - int err, found, cnt, pkt_id, pkt_len; > - struct ccb_data *data = fp->private_data; > + int err = 0, found, cnt, pkt_id, pkt_len; > + struct ccb_data *data = iocb->ki_filp->private_data; > struct ccb *driver_ccb = &data->driver_ccb; > struct ilo_hwinfo *hw = data->ilo_hw; > void *pkt; > + size_t len = iov_iter_count(to), copied; > > if (is_channel_reset(driver_ccb)) { > /* > @@ -477,7 +478,9 @@ static ssize_t ilo_read(struct file *fp, char __user *buf, > if (pkt_len < len) > len = pkt_len; > > - err = copy_to_user(buf, pkt, len); > + copied = copy_to_iter(pkt, len, to); > + if (unlikely(copied != len)) > + err = -EFAULT; > > /* return the received packet to the queue */ > ilo_pkt_enqueue(hw, driver_ccb, RECVQ, pkt_id, desc_mem_sz(1)); > @@ -485,14 +488,14 @@ static ssize_t ilo_read(struct file *fp, char __user *buf, > return err ? -EFAULT : len; > } > > -static ssize_t ilo_write(struct file *fp, const char __user *buf, > - size_t len, loff_t *off) > +static ssize_t ilo_write_iter(struct kiocb *iocb, struct iov_iter *from) > { > - int err, pkt_id, pkt_len; > - struct ccb_data *data = fp->private_data; > + int err = 0, pkt_id, pkt_len; > + struct ccb_data *data = iocb->ki_filp->private_data; > struct ccb *driver_ccb = &data->driver_ccb; > struct ilo_hwinfo *hw = data->ilo_hw; > void *pkt; > + size_t len = iov_iter_count(from), copied; > > if (is_channel_reset(driver_ccb)) > return -ENODEV; > @@ -506,9 +509,11 @@ static ssize_t ilo_write(struct file *fp, const char __user *buf, > len = pkt_len; > > /* on failure, set the len to 0 to return empty packet to the device */ > - err = copy_from_user(pkt, buf, len); > - if (err) > + copied = copy_from_iter(pkt, len, from); > + if (unlikely(copied != len)) { > len = 0; > + err = -EFAULT; > + } > > /* send the packet */ > ilo_pkt_enqueue(hw, driver_ccb, SENDQ, pkt_id, len); > @@ -639,8 +644,8 @@ out: > > static const struct file_operations ilo_fops = { > .owner = THIS_MODULE, > - .read = ilo_read, > - .write = ilo_write, > + .read_iter = ilo_read_iter, > + .write_iter = ilo_write_iter, > .poll = ilo_poll, > .open = ilo_open, > .release = ilo_close, > -- > 2.16.6 >
Hi,
This is the friendly patch-bot of Greg Kroah-Hartman. You have sent him a patch that has triggered this response. He used to manually respond to these common problems, but in order to save his sanity (he kept writing the same thing over and over, yet to different people), I was created. Hopefully you will not take offence and will fix the problem in your patch and resubmit it so that it can be accepted into the Linux kernel tree.
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thanks,
greg k-h's patch email bot
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