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Subject[PATCH 5.15 050/247] tty: n_gsm: Dont ignore write return value in gsmld_output()
Date
From: Tony Lindgren <tony@atomide.com>

[ Upstream commit 9136c68346d096697935b9840782f7051d5796c5 ]

We currently have gsmld_output() ignore the return value from device
write. This means we will lose packets if device write returns 0 or
an error.

Signed-off-by: Tony Lindgren <tony@atomide.com>
Link: https://lore.kernel.org/r/20210930060624.46523-1-tony@atomide.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/tty/n_gsm.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c
index 1767503de744..0722860b6f54 100644
--- a/drivers/tty/n_gsm.c
+++ b/drivers/tty/n_gsm.c
@@ -692,7 +692,7 @@ static void gsm_data_kick(struct gsm_mux *gsm, struct gsm_dlci *dlci)
print_hex_dump_bytes("gsm_data_kick: ",
DUMP_PREFIX_OFFSET,
gsm->txframe, len);
- if (gsmld_output(gsm, gsm->txframe, len) < 0)
+ if (gsmld_output(gsm, gsm->txframe, len) <= 0)
break;
/* FIXME: Can eliminate one SOF in many more cases */
gsm->tx_bytes -= msg->len;
@@ -2373,8 +2373,7 @@ static int gsmld_output(struct gsm_mux *gsm, u8 *data, int len)
if (debug & 4)
print_hex_dump_bytes("gsmld_output: ", DUMP_PREFIX_OFFSET,
data, len);
- gsm->tty->ops->write(gsm->tty, data, len);
- return len;
+ return gsm->tty->ops->write(gsm->tty, data, len);
}

/**
--
2.35.1


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