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mpsse: check available buffer space even for discarded data scans 

When there's no data to scan in or out, we still use the clock data out
command and fill the buffer with zeroes, so make sure the buffer is
checked for available space.

Change-Id: Ia6005c40c81f7fdb89379f1b5023fe383184d210
Signed-off-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>
Reviewed-on: http://openocd.zylin.com/793
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>
Tested-by: jenkins
Reviewed-by: Freddie Chopin <freddie.chopin@gmail.com>
__archive__
Andreas Fritiofson 2012-08-23 23:28:10 +02:00 committed by Freddie Chopin
parent d7f5a00cdc
commit d9a02fda07
1 changed files with 4 additions and 4 deletions
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4
src/jtag/drivers/mpsse.c
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@ -443,7 +443,7 @@ int mpsse_clock_data(struct mpsse_ctx *ctx, const uint8_t *out, unsigned out_off
while (length > 0) {
/* Guarantee buffer space enough for a minimum size transfer */
if (buffer_write_space(ctx) + (length < 8) < (out ? 4 : 3)
if (buffer_write_space(ctx) + (length < 8) < (out || (!out && !in) ? 4 : 3)
|| (in && buffer_read_space(ctx) < 1))
retval = mpsse_flush(ctx);
@ -466,7 +466,7 @@ int mpsse_clock_data(struct mpsse_ctx *ctx, const uint8_t *out, unsigned out_off
this_bytes = 65536;
/* Buffer space limit. We already made sure there's space for the minimum
* transfer. */
if (out && this_bytes + 3 > buffer_write_space(ctx))
if ((out || (!out && !in)) && this_bytes + 3 > buffer_write_space(ctx))
this_bytes = buffer_write_space(ctx) - 3;
if (in && this_bytes > buffer_read_space(ctx))
this_bytes = buffer_read_space(ctx);