> From: Vincent Fann <vincent_fann@xxxxxxxxxxx> > > Several of these drivers have there TX randomly blocked for 3~5 seconds while > measuring tx throughput (iperf). The root couse happens in rtl_pci_flush(). > The function uses a while-loop to wait for TX queue length to decrease to 0. > The TX queue length counts the number of packets that are queued in the driver. > The driver relys on the TX OK interrupt to return skb and reduce TX queue length. > > The interrupt subroutine disables interupts, reads the interrupt registers, and > then clears the registers in the beginning of _rtl_pci_interrupt(). After all > interupts process are finished, the driver invokes enable_interrupt() to enable > interupts. This behavior is normal for an interrupt subroutine. > > But enable_interrupt() invokes clear_interrupt() again. This unexpected interrupt > clearing may cleari me fresh TX OK interrupts. These missing interrupts cause TX > queue length to never reduce to 0i, which causes rtl_pci_flush() to be stuck in > unterminated while-loop. > > This patch removes clear_interrupt() in enable_interrupt() to avoid this behavior. > > Signed-off-by: Vincent Fann <vincent_fann@xxxxxxxxxxx> > Signed-off-by: Shao Fu <shaofu@xxxxxxxxxxx> > Signed-off-by: Larry Finger <Larry.Finger@xxxxxxxxxxxx> > Cc: Stable <stable@xxxxxxxxxxxxxxx> [3.18+] Thanks, applied to wireless-drivers-next.git. Kalle Valo -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
