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Do not attempt to refill the TX fifo if there is no data left to transfer.

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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.
This commit is contained in:
Ian Lepore 2017-12-18 02:34:37 +00:00
parent ae99239461
commit b5496277c7
1 changed files with 1 additions and 1 deletions
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2
sys/arm/broadcom/bcm2835/bcm2835_bsc.c
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@ -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);
}