Author: ian
Date: Mon Dec 18 02:34:37 2017
New Revision: 326925
URL: https://svnweb.freebsd.org/changeset/base/326925
Log:
Do not attempt to refill the TX fifo if there is no data left to transfer.
A comment in bcm_bsc_fill_tx_fifo() even lists sc_totlen > 0 as a
precondition for calling the routine. I apparently forgot to make the
code do what my comment said.
Modified:
head/sys/arm/broadcom/bcm2835/bcm2835_bsc.c
Modified: head/sys/arm/broadcom/bcm2835/bcm2835_bsc.c
==============================================================================
--- head/sys/arm/broadcom/bcm2835/bcm2835_bsc.c Mon Dec 18 00:15:53 2017
(r326924)
+++ head/sys/arm/broadcom/bcm2835/bcm2835_bsc.c Mon Dec 18 02:34:37 2017
(r326925)
@@ -508,7 +508,7 @@ bcm_bsc_intr(void *arg)
* transfer is complete; TXD will be asserted along with ERR or
* DONE if there is room in the fifo.
*/
- if (status & BCM_BSC_STATUS_TXD)
+ if ((status & BCM_BSC_STATUS_TXD) && sc->sc_totlen > 0)
bcm_bsc_fill_tx_fifo(sc);
}
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