Commit c22d054f authored by Daniel Starke's avatar Daniel Starke Committed by Greg Kroah-Hartman
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tty: n_gsm: add debug bit for user payload 



A debug bit to output a complete transmission dump exists. Sometimes only
the user frames are relevant. Add an additional bit which limits the
transmission dump output to user data frames if set.

Signed-off-by: default avatarDaniel Starke <daniel.starke@siemens.com>
Link: https://lore.kernel.org/r/20220831073800.7459-6-daniel.starke@siemens.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent c07da737

drivers/tty/n_gsm.c

+5 −0
Original line number Diff line number Diff line
@@ -69,6 +69,7 @@ module_param(debug, int, 0600); 
#define DBG_DATA	BIT(2) /* Data transmission details. */

#define DBG_ERRORS	BIT(3) /* Details for fail conditions. */

#define DBG_TTY		BIT(4) /* Transmission statistics for DLCI TTYs. */

#define DBG_PAYLOAD	BIT(5) /* Limits DBG_DUMP to payload frames. */



/* Defaults: these are from the specification */
@@ -598,6 +599,10 @@ static void gsm_print_packet(const char *hdr, int addr, int cr, 
{

	if (!(debug & DBG_DUMP))

		return;

	/* Only show user payload frames if debug & DBG_PAYLOAD */

	if (!(debug & DBG_PAYLOAD) && addr != 0)

		if ((control & ~PF) == UI || (control & ~PF) == UIH)

			return;



	pr_info("%s %d) %c: ", hdr, addr, "RC"[cr]);