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tty: hvc: udbg_hvc: retry putc on -EAGAIN

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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@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210514214422.3019105-1-nathanl@linux.ibm.com
This commit is contained in:
Nathan Lynch
2021-05-14 16:44:22 -05:00
committed by Michael Ellerman
parent 2cec178e35
commit 027f55e87c
1 changed files with 1 additions and 1 deletions
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2
drivers/tty/hvc/hvc_vio.c
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@ -249,7 +249,7 @@ static void udbg_hvc_putc(char c)
count = hvterm_hvsi_put_chars(0, &c, 1);
break;
}
} while(count == 0);
} while (count == 0 || count == -EAGAIN);
}
static int udbg_hvc_getc_poll(void)