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n_gsm: Fix timings 

Alek Du reported that the code erroneously applies time to jiffies
conversions twice to the t1 and t2 values. In normal use on a modem link
this cases no visible problem but on a slower link it will break as with
HZ=1000 as is typical we are running t1/t2 ten times too fast.

Alek's original patch removed the conversion from the timer setting but we
in fact have to be more careful as the contents of t1/t2 are visible via
the device API and we thus need to correct the constants.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
hifive-unleashed-5.1
Alan Cox 2011-11-08 18:02:10 +00:00 committed by Linus Torvalds
parent 1ea6b8f489
commit a8d12007c7
1 changed files with 7 additions and 5 deletions
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12
drivers/tty/n_gsm.c
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@ -66,14 +66,16 @@
static int debug;
module_param(debug, int, 0600);
#define T1 (HZ/10)
#define T2 (HZ/3)
#define N2 3
/* Defaults: these are from the specification */
#define T1 10 /* 100mS */
#define T2 34 /* 333mS */
#define N2 3 /* Retry 3 times */
/* Use long timers for testing at low speed with debug on */
#ifdef DEBUG_TIMING
#define T1 HZ
#define T2 (2 * HZ)
#define T1 100
#define T2 200
#endif
/*