Re: [PATCH] staging: pi433: add rw semaphore fixing concurrency issues

From: Hugo Lefeuvre
Date: Fri Jun 01 2018 - 09:51:32 EST


Hi Valdis,

> > @@ -805,9 +809,11 @@ pi433_read(struct file *filp, char __user *buf, size_t size, loff_t *f_pos)
> > if (bytes_received > 0) {
> > retval = copy_to_user(buf, device->rx_buffer, bytes_received);
> > if (retval)
> > + up_read(&instance->instance_sem);
> > return -EFAULT;
> > }
> >
> > + up_read(&instance->instance_sem);
> > return bytes_received;
> > }
>
> This doesn't do what you think.

Oh right, no curly braces, didn't notice it. Thanks !

Otherwise, do you think the usage of rw semaphore is appropriate in this
case ?

Regards,
Hugo

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Hugo Lefeuvre (hle) | www.owl.eu.com
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