On 2/23/22 17:07, Andy Shevchenko wrote:
On Fri, Feb 18, 2022 at 02:33:48PM +0100, Jan Dabros wrote:
Kernel test robot reported incorrect type in argument 1 of readl(), but
more importantly it brought attention that MMIO accessor shouldn't be
used in this case, since req->hdr.status is part of a command-response
buffer in system memory.
Since its value may be altered by PSP outside of the scope of current
thread (somehow similar to IRQ handler case), we need to use
READ_ONCE() to ensure compiler won't optimize this call.
Fix also 'status' variable type to reflect that corresponding field in
command-response buffer is platform-independent u32.
Thanks for the fix, seems reasonable to me.
Reviewed-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Acked-by: Jarkko Nikula <jarkko.nikula@xxxxxxxxxxxxxxx>
