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Date: Mon, 21 Mar 2022 15:51:36 +0200 From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com> To: Wolfram Sang <wsa+renesas@...g-engineering.com> Cc: linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org, linux-renesas-soc@...r.kernel.org Subject: Re: [PATCH v7 1/1] gpio: add sloppy logic analyzer using polling On Thu, Mar 17, 2022 at 09:50:19AM +0100, Wolfram Sang wrote: > This is a sloppy logic analyzer using GPIOs. It comes with a script to > isolate a CPU for polling. While this is definitely not a production > level analyzer, it can be a helpful first view when remote debugging. > Read the documentation for details. ... > + for (i = 0; i < priv->trig_len; i+= 2) { Missed space. > + do { > + ret = gpio_la_get_array(priv->descs, &state); > + if (ret) > + goto out; > + > + ndelay(delay); > + } while ((state & priv->trig_data[i]) != priv->trig_data[i + 1]); > + } ... > +static int fops_buf_size_set(void *data, u64 val) > +{ > + struct gpio_la_poll_priv *priv = data; > + int ret = 0; Instead of this assignment and other related things, can we do the following? > + void *p; > + > + if (!val) > + return -EINVAL; > + > + mutex_lock(&priv->lock); > + > + vfree(priv->blob.data); priv->blob.data = NULL; priv->blob.size = 0; > + p = vzalloc(val); > + if (!p) { > + val = 0; > + ret = -ENOMEM; > + } p = vzalloc(val); if (!p) return -ENOMEM; > + priv->blob.data = p; > + priv->blob.size = val; > + > + mutex_unlock(&priv->lock); > + return ret; > +} > +DEFINE_DEBUGFS_ATTRIBUTE(fops_buf_size, fops_buf_size_get, fops_buf_size_set, "%llu\n"); > + priv->trig_data = buf; > + priv->trig_len = count; > + > + return count; > +} > + > +static const struct file_operations fops_trigger = { > + .owner = THIS_MODULE, > + .open = trigger_open, > + .write = trigger_write, > + .llseek = no_llseek, > + .release = single_release, > +}; Can it be wrapped by DEFINE_SHOW_ATTRIBUTE()? ... > + dev_info(dev, "initialized"); Not sure how this one would be helpful. -- With Best Regards, Andy Shevchenko
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