[PATCH] powerpc/udbg_hvc: retry putc on -EAGAIN

Greg KH gregkh at linuxfoundation.org
Fri May 21 22:47:36 AEST 2021

On Fri, May 14, 2021 at 04:44:22PM -0500, Nathan Lynch wrote:
> hvterm_raw_put_chars() calls hvc_put_chars(), which may return -EAGAIN
> when the underlying hcall returns a "busy" status, but udbg_hvc_putc()
> doesn't handle this. When using xmon on a PowerVM guest, this can
> result in incomplete or garbled output when printing relatively large
> amounts of data quickly, such as when dumping the kernel log buffer.
> Call again on -EAGAIN.
> Signed-off-by: Nathan Lynch <nathanl at linux.ibm.com>
> ---
>  drivers/tty/hvc/hvc_vio.c | 2 +-

Subject line does not match up with this file name.

Don't you want "tty" and "hvc" in there somewhere?


greg k-h

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