Avoid duplicate writes to the head register as this can lead to lost interrupts if the context goes full before the second write is done.
Signed-off-by: Mike Marciniszyn <[email protected]> --- drivers/infiniband/hw/qib/qib_driver.c | 10 +++++++++- 1 files changed, 9 insertions(+), 1 deletions(-) diff --git a/drivers/infiniband/hw/qib/qib_driver.c b/drivers/infiniband/hw/qib/qib_driver.c index 9cd1936..3ed0d5a 100644 --- a/drivers/infiniband/hw/qib/qib_driver.c +++ b/drivers/infiniband/hw/qib/qib_driver.c @@ -71,6 +71,11 @@ MODULE_DESCRIPTION("QLogic IB driver"); */ #define QIB_PIO_MAXIBHDR 128 +/* + * QIB_MAX_PKT_RCV is the max # if packets processed per receive interrupt. + */ +#define QIB_MAX_PKT_RECV 64 + struct qlogic_ib_stats qib_stats; const char *qib_get_unit_name(int unit) @@ -335,7 +340,7 @@ u32 qib_kreceive(struct qib_ctxtdata *rcd, u32 *llic, u32 *npkts) smp_rmb(); /* prevent speculative reads of dma'ed hdrq */ } - for (last = 0, i = 1; !last && i <= 64; i += !last) { + for (last = 0, i = 1; !last; i += !last) { hdr = dd->f_get_msgheader(dd, rhf_addr); eflags = qib_hdrget_err_flags(rhf_addr); etype = qib_hdrget_rcv_type(rhf_addr); @@ -384,6 +389,9 @@ move_along: l += rsize; if (l >= maxcnt) l = 0; + if (i == QIB_MAX_PKT_RECV) + last = 1; + rhf_addr = (__le32 *) rcd->rcvhdrq + l + dd->rhf_offset; if (dd->flags & QIB_NODMA_RTAIL) { u32 seq = qib_hdrget_seq(rhf_addr); -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
