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authorNathan Lynch <nathanl@linux.ibm.com>2021-05-14 16:44:22 -0500
committerMichael Ellerman <mpe@ellerman.id.au>2021-05-23 20:51:36 +1000
commit027f55e87c3094270a3223f7331d033fe15a2b3f (patch)
tree47edc7a5436d55ec6e70c78f3f6d41ea65b6d8db /drivers
parent2cec178e35baf57d307c0982fd2e53055bd1e9bb (diff)
tty: hvc: udbg_hvc: retry putc on -EAGAIN
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
Diffstat (limited to 'drivers')
-rw-r--r--drivers/tty/hvc/hvc_vio.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/tty/hvc/hvc_vio.c b/drivers/tty/hvc/hvc_vio.c
index 798f27f40cc2..72b11aa7e0a6 100644
--- a/drivers/tty/hvc/hvc_vio.c
+++ b/drivers/tty/hvc/hvc_vio.c
@@ -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)