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tty: n_gsm: Debug output allocation must use GFP_ATOMIC

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Dan Carpenter <dan.carpenter@oracle.com> reported the following Smatch
warning:

drivers/tty/n_gsm.c:720 gsm_data_kick()
warn: sleeping in atomic context

This is because gsm_control_message() is holding a spin lock so
gsm_hex_dump_bytes() needs to use GFP_ATOMIC instead of GFP_KERNEL.

Fixes: 925ea0fa52 ("tty: n_gsm: Fix packet data hex dump output")
Cc: stable <stable@kernel.org>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Gregory CLEMENT <gregory.clement@bootlin.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Link: https://lore.kernel.org/r/20220523155052.57129-1-tony@atomide.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tony Lindgren 2022-05-23 18:50:52 +03:00 • committed by Greg Kroah-Hartman
parent f2906aa863
commit e74024b2ec
1 changed files with 1 additions and 1 deletions
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2
drivers/tty/n_gsm.c
View file

@ -455,7 +455,7 @@ static void gsm_hex_dump_bytes(const char *fname, const u8 *data,
return;
}
prefix = kasprintf(GFP_KERNEL, "%s: ", fname);
prefix = kasprintf(GFP_ATOMIC, "%s: ", fname);
if (!prefix)
return;
print_hex_dump(KERN_INFO, prefix, DUMP_PREFIX_OFFSET, 16, 1, data, len,