This is a note to let you know that I've just added the patch titled tty: n_gsm: Fix packet data hex dump output to the 5.17-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: tty-n_gsm-fix-packet-data-hex-dump-output.patch and it can be found in the queue-5.17 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 925ea0fa5277c1e6bb9e51955ef34eea9736c3d7 Mon Sep 17 00:00:00 2001 From: Tony Lindgren <tony@xxxxxxxxxxx> Date: Thu, 12 May 2022 16:15:06 +0300 Subject: tty: n_gsm: Fix packet data hex dump output From: Tony Lindgren <tony@xxxxxxxxxxx> commit 925ea0fa5277c1e6bb9e51955ef34eea9736c3d7 upstream. The module param debug for n_gsm uses KERN_INFO level, but the hexdump now uses KERN_DEBUG level. This started after commit 091cb0994edd ("lib/hexdump: make print_hex_dump_bytes() a nop on !DEBUG builds"). We now use dynamic_hex_dump() unless DEBUG is set. This causes no packets to be seen with modprobe n_gsm debug=0x1f unlike earlier. Let's fix this by adding gsm_hex_dump_bytes() that calls print_hex_dump() with KERN_INFO to match what n_gsm is doing with the other debug related output. Fixes: 091cb0994edd ("lib/hexdump: make print_hex_dump_bytes() a nop on !DEBUG builds") Cc: Stephen Boyd <swboyd@xxxxxxxxxxxx> Signed-off-by: Tony Lindgren <tony@xxxxxxxxxxx> Link: https://lore.kernel.org/r/20220512131506.1216-1-tony@xxxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/tty/n_gsm.c | 31 +++++++++++++++++++++++-------- 1 file changed, 23 insertions(+), 8 deletions(-) --- a/drivers/tty/n_gsm.c +++ b/drivers/tty/n_gsm.c @@ -444,6 +444,25 @@ static u8 gsm_encode_modem(const struct return modembits; } +static void gsm_hex_dump_bytes(const char *fname, const u8 *data, + unsigned long len) +{ + char *prefix; + + if (!fname) { + print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE, 16, 1, data, len, + true); + return; + } + + prefix = kasprintf(GFP_KERNEL, "%s: ", fname); + if (!prefix) + return; + print_hex_dump(KERN_INFO, prefix, DUMP_PREFIX_OFFSET, 16, 1, data, len, + true); + kfree(prefix); +} + /** * gsm_print_packet - display a frame for debug * @hdr: header to print before decode @@ -508,7 +527,7 @@ static void gsm_print_packet(const char else pr_cont("(F)"); - print_hex_dump_bytes("", DUMP_PREFIX_NONE, data, dlen); + gsm_hex_dump_bytes(NULL, data, dlen); } @@ -698,9 +717,7 @@ static void gsm_data_kick(struct gsm_mux } if (debug & 4) - print_hex_dump_bytes("gsm_data_kick: ", - DUMP_PREFIX_OFFSET, - gsm->txframe, len); + gsm_hex_dump_bytes(__func__, gsm->txframe, len); if (gsmld_output(gsm, gsm->txframe, len) <= 0) break; /* FIXME: Can eliminate one SOF in many more cases */ @@ -2448,8 +2465,7 @@ static int gsmld_output(struct gsm_mux * return -ENOSPC; } if (debug & 4) - print_hex_dump_bytes("gsmld_output: ", DUMP_PREFIX_OFFSET, - data, len); + gsm_hex_dump_bytes(__func__, data, len); return gsm->tty->ops->write(gsm->tty, data, len); } @@ -2525,8 +2541,7 @@ static void gsmld_receive_buf(struct tty char flags = TTY_NORMAL; if (debug & 4) - print_hex_dump_bytes("gsmld_receive: ", DUMP_PREFIX_OFFSET, - cp, count); + gsm_hex_dump_bytes(__func__, cp, count); for (; count; count--, cp++) { if (fp) Patches currently in stable-queue which might be from tony@xxxxxxxxxxx are queue-5.17/tty-n_gsm-fix-packet-data-hex-dump-output.patch queue-5.17/arm-omap1-clock-fix-uart-rate-reporting-algorithm.patch