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Message-ID: <111937545.nniJfEyVGO@suse>
Date: Thu, 16 Mar 2023 20:30:06 +0100
From: "Fabio M. De Francesco" <fmdefrancesco@...il.com>
To: outreachy@...ts.linux.dev,
Khadija Kamran <kamrankhadijadj@...il.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6] staging: axis-fifo: initialize timeouts in init only
On giovedì 16 marzo 2023 19:11:09 CET Fabio M. De Francesco wrote:
> On giovedì 16 marzo 2023 17:26:15 CET Khadija Kamran wrote:
> > Initialize the module parameters, read_timeout and write_timeout once in
> > init().
> >
> > Module parameters can only be set once and cannot be modified later, so we
> > don't need to evaluate them again when passing the parameters to
> > wait_event_interruptible_timeout().
> >
> > Convert datatype of {read,write}_timeout from 'int' to 'long int' because
> > implicit conversion of 'long int' to 'int' in statement
> > '{read,write}_timeout = MAX_SCHEDULE_TIMEOUT' results in an overflow.
> >
> > Change format specifier for {read,write}_timeout from %i to %li.
>
> It's good that you added this line. I had missed it :-)
>
> > Suggested-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> > Signed-off-by: Khadija Kamran <kamrankhadijadj@...il.com>
> > ---
> >
> > Changes in v6:
> > - Initialize module parameters in init instead of probe function.
> > - Change the subject and description
> > - Change format specifiers of module parameters to "%li"
> >
> > Changes in v5:
> > - Convert module parameters's datatype from int to long.
>
> NIT: "parameters'", not "parameters's".
>
> > - Link to patch:
> > https://lore.kernel.org/outreachy/ZBMR4s8xyHGqMm72@khadija-virtual-machine/
> >
> > Changes in v4:
> > - Initialize timeouts once as suggested by Greg; this automatically
> >
> > fixes the indentation problems.
> >
> > - Change the subject and description.
> > - Link to patch:
> > https://lore.kernel.org/outreachy/ZA4M3+ZeB1Rl2fbs@khadija-virtual-machine/
> >
> > Changes in v3:
> > - Correct grammatical mistakes
> > - Do not change the second argument's indentation in split lines
> >
> > Changes in v2:
> > - Instead of matching alignment to open parenthesis, align second and
> >
> > the last argument.
> >
> > - Change the subject and use imperative language.
> > - Link to patch:
> > https://lore.kernel.org/outreachy/ZAxNYw2rFQkrdtKl@khadija-virtual-machine/
> >
> > Link to first patch:
> > https://lore.kernel.org/outreachy/ZAZSmPpB6fcozGa4@khadija-virtual-machine/
> >
> > drivers/staging/axis-fifo/axis-fifo.c | 28 ++++++++++++++++-----------
> >
> > 1 file changed, 17 insertions(+), 11 deletions(-)
> >
> > diff --git a/drivers/staging/axis-fifo/axis-fifo.c
> > b/drivers/staging/axis-fifo/axis-fifo.c index dfd2b357f484..0a85ea667a1b
> > 100644
> > --- a/drivers/staging/axis-fifo/axis-fifo.c
> > +++ b/drivers/staging/axis-fifo/axis-fifo.c
> > @@ -103,17 +103,17 @@
> >
> > * globals
> > * ----------------------------
> > */
> >
> > -static int read_timeout = 1000; /* ms to wait before read() times out */
> > -static int write_timeout = 1000; /* ms to wait before write() times out
*/
> > +static long read_timeout = 1000; /* ms to wait before read() times out */
> > +static long write_timeout = 1000; /* ms to wait before write() times out
*/
> >
> > /* ----------------------------
> >
> > * module command-line arguments
> > * ----------------------------
> > */
> >
> > -module_param(read_timeout, int, 0444);
> > +module_param(read_timeout, long, 0444);
> >
> > MODULE_PARM_DESC(read_timeout, "ms to wait before blocking read() timing
>
> out;
>
> > set to -1 for no timeout"); -module_param(write_timeout, int, 0444);
> > +module_param(write_timeout, long, 0444);
> >
> > MODULE_PARM_DESC(write_timeout, "ms to wait before blocking write()
timing
> >
> > out; set to -1 for no timeout");
> >
> > /* ----------------------------
> >
> > @@ -384,9 +384,7 @@ static ssize_t axis_fifo_read(struct file *f, char
>
> __user
>
> > *buf, mutex_lock(&fifo->read_lock);
> >
> > ret = wait_event_interruptible_timeout(fifo->read_queue,
> >
> > ioread32(fifo->base_addr + XLLF_RDFO_OFFSET),
> >
> > - (read_timeout >= 0) ?
> > - msecs_to_jiffies(read_timeout) :
> > - MAX_SCHEDULE_TIMEOUT);
> > + read_timeout);
> >
> > if (ret <= 0) {
> >
> > if (ret == 0) {
> >
> > @@ -528,9 +526,7 @@ static ssize_t axis_fifo_write(struct file *f, const
>
> char
>
> > __user *buf, ret = wait_event_interruptible_timeout(fifo->write_queue,
> >
> > ioread32(fifo->base_addr + XLLF_TDFV_OFFSET)
> >
> > >= words_to_write,
>
> NIT: I don't really like this split of the second argument into two lines.
> This line may look too long, but I don't think that it should be split. I
> prefer to read
>
> "ioread32(fifo->base_addr + XLLF_TDFV_OFFSET) >= words_to_write,"
>
> However, the final decision is up to Greg.
>
> If he takes the code as is, I have nothing against.
> Don't send any other version unless required by Greg or other Mentors with
> more experience than I have.
>
> All the rest look good... well done!
>
> Reviewed-by: Fabio M. De Francesco
Sorry, I got distracted while copy-pasting my own address...
Reviewed-by: Fabio M. De Francesco <fmdefrancesco@...il.com>
> Please feel free to forward my tag if you are required to change that line
and
> send a new version.
>
> Thanks,
>
> Fabio
>
> > - (write_timeout >= 0) ?
> > - msecs_to_jiffies(write_timeout) :
> > - MAX_SCHEDULE_TIMEOUT);
> > + write_timeout);
> >
> > if (ret <= 0) {
> >
> > if (ret == 0) {
> >
> > @@ -948,7 +944,17 @@ static struct platform_driver axis_fifo_driver = {
> >
> > static int __init axis_fifo_init(void)
> > {
> >
> > - pr_info("axis-fifo driver loaded with parameters read_timeout = %i,
> > write_timeout = %i\n", + if (read_timeout >= 0)
> > + read_timeout = msecs_to_jiffies(read_timeout);
> > + else
> > + read_timeout = MAX_SCHEDULE_TIMEOUT;
> > +
> > + if (write_timeout >= 0)
> > + write_timeout = msecs_to_jiffies(write_timeout);
> > + else
> > + write_timeout = MAX_SCHEDULE_TIMEOUT;
> > +
> > + pr_info("axis-fifo driver loaded with parameters read_timeout = %li,
> > write_timeout = %li\n", read_timeout, write_timeout);
> >
> > return platform_driver_register(&axis_fifo_driver);
> >
> > }
> >
> > --
> > 2.34.1
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